H2O
Monthly
Remote denial of service in the h2o HTTP server (all versions prior to commit 9265bdd) allows unauthenticated attackers to exhaust server memory by combining HPACK header-decompression amplification with Slowloris-style HTTP/2 stream stalling. By opening many streams that stall mid-request, an attacker forces the server to retain large volumes of amplified decoded header state, degrading or crashing the service. There is no public exploit identified at time of analysis, and the CVSS 7.5 (A:H only) reflects an availability-only impact with no confidentiality or integrity effect.
Denial of service in the h2o HTTP server (all versions prior to commit 6b5370d) allows remote unauthenticated attackers to crash the server by requesting static files whose on-stack path construction via alloca can reach ~600KB, exceeding musl libc's default 128KB pthread stack and triggering a guard-page segmentation fault. The flaw is a CWE-770 uncontrolled resource allocation issue affecting availability only (CVSS 7.5, A:H). There is no public exploit identified at time of analysis and it is not listed in CISA KEV, but exploitation is trivial where h2o is built against musl libc.
Denial of service in Quicly, the QUIC protocol library embedded in the H2O HTTP server, allows remote attackers to corrupt connection state and crash the process prior to commit 8b178e6. Quicly's packet decoder accepts Connection IDs up to 255 bytes (permitted for unknown QUIC versions) but its version-1 CID buffers are only 20 bytes, and the library - unlike its bundled CLI - never rejected over-length CIDs, letting an oversized CID overrun the buffer within its allocated chunk and trigger assertion failures. No public exploit is identified at time of analysis, and the flaw is not listed in CISA KEV.
Remote denial of service in quicly, the IETF QUIC implementation used by the H2O HTTP server, allows unauthenticated attackers to crash the process by sending more than 32KB of valid handshake messages over the CRYPTO stream within a single packet number space, tripping a reachable assertion (CWE-617). Affects all builds prior to commit 937d0e9. No public exploit identified at time of analysis and the flaw is not in CISA KEV, but the network-reachable, no-privilege nature makes it trivially triggerable once understood.
Memory exhaustion in Quicly's QUIC flow control handling allows an unauthenticated remote peer to force disproportionate receive buffer allocation in the H2O HTTP server by sending STREAM frames containing a single byte placed at the maximum permitted stream offset. The library pre-allocates buffers up to the largest received offset to accommodate out-of-order delivery, so a handful of crafted packets can cause the server to allocate memory far exceeding what the transferred data warrants. Under H2O's default stream concurrency settings, this attack multiplies per-connection memory usage by roughly 4x, making memory exhaustion achievable at low bandwidth cost. No public exploit identified at time of analysis; EPSS is 0.25% (16th percentile) and CISA SSVC lists exploitation as 'none', suggesting no observed real-world abuse.
Remote unauthenticated denial of service in the h2o HTTP server (all versions prior to commit edd7a120bfc4af11ac0cbebce2a43cc1f93f9af1) allows an attacker to crash the server by sending a crafted QPACK instruction over HTTP/3. The flaw causes lib/http3/qpack.c to allocate an ~800 KB on-stack buffer via alloca, overflowing the default musl libc pthread stack and segfaulting on the guard page. No public exploit identified at time of analysis, and the issue is not listed in CISA KEV; impact is limited to availability with no data exposure.
Denial of service against HTTP/2 server implementations allows remote unauthenticated attackers to exhaust server resources by rapidly opening and immediately canceling (RST_STREAM) large numbers of streams over a single connection, a technique dubbed the 'Rapid Reset' attack. The flaw is confirmed actively exploited (CISA KEV) following large-scale weaponization observed August through October 2023, with publicly available exploit code and an EPSS score of 94.45% placing it in the 100th percentile for likelihood of exploitation. Virtually every major HTTP/2 stack - including nghttp2, Netty, Envoy, and Eclipse Jetty - is affected.
Stack exhaustion in the Picotls minicrypto backend's custom ASN.1 validator allows an attacker who can supply crafted private-key material to crash any application that calls ptls_minicrypto_load_private_key() or the public ptls_asn1_validation() API on untrusted DER input. All Picotls versions prior to upstream commit c14231d80 are affected when the minicrypto backend is in use; applications using the libcrypto (OpenSSL) backend are immune because OpenSSL performs its own bounded DER parsing. No public exploit has been identified and no CISA KEV listing exists; CVSS 5.5 reflects a local, user-interaction-dependent denial-of-service with no code execution potential.
Denial-of-service via malformed TLS/QUIC ClientHello in h2o HTTP server allows remote unauthenticated attackers to crash the server process by sending a zero-length SNI extension. The hostname-copy routine assumes NULL-termination on the empty SNI buffer (CWE-125 out-of-bounds read), reading beyond the allocation boundary and triggering a segmentation fault. No public exploit or active exploitation (CISA KEV) has been identified; the fix is available as an upstream commit but no confirmed tagged release exists at time of analysis.
Stateless reset injection in Quicly, the IETF QUIC implementation embedded in the H2O HTTP server, allows an on-path network attacker to abruptly terminate any active QUIC connection by sending an all-zero packet. The root cause is that Quicly zero-initializes its four stateless reset token slots but never validates which slots hold legitimate peer-advertised tokens, causing the all-zero default to be accepted as a valid reset signal whenever the peer has advertised fewer than four tokens. No public exploit code or active exploitation has been identified at time of analysis; however, the attack is mechanically straightforward for any adversary already positioned on the network path.
Quicly, an IETF QUIC protocol implementation, is susceptible to a denial-of-service attack prior to commit d9d3df6a8530a102b57d840e39b0311ce5c9e14e. A remote attacker can exploit these bugs to trigger an assertion failure that crashes process using Quicly. [CVSS 7.5 HIGH]
A vulnerability has been found in h2oai h2o-3 up to 3.46.08. Rated medium severity (CVSS 5.3), this vulnerability is remotely exploitable, low attack complexity. Public exploit code available and no vendor patch available.
A flaw has been found in h2oai h2o-3 up to 3.46.08. Rated medium severity (CVSS 5.3), this vulnerability is remotely exploitable, low attack complexity. Public exploit code available and no vendor patch available.
A deserialization vulnerability exists in h2oai/h2o-3 versions <= 3.46.0.8, allowing attackers to read arbitrary system files and execute arbitrary code. Rated critical severity (CVSS 9.8), this vulnerability is remotely exploitable, no authentication required, low attack complexity. Public exploit code available.
In h2oai/h2o-3 version 3.46.0, the `/99/Models/{name}/json` endpoint allows for arbitrary file overwrite on the target server. Rated high severity (CVSS 8.2), this vulnerability is remotely exploitable, no authentication required, low attack complexity. Public exploit code available and no vendor patch available.
A vulnerability in the typeahead endpoint of h2oai/h2o-3 version 3.46.0 allows for a denial of service. Rated high severity (CVSS 7.5), this vulnerability is remotely exploitable, no authentication required, low attack complexity. Public exploit code available and no vendor patch available.
A vulnerability in the `/3/ImportFiles` endpoint of h2oai/h2o-3 version 3.46.1 allows an attacker to cause a denial of service. Rated high severity (CVSS 7.5), this vulnerability is remotely exploitable, no authentication required, low attack complexity. Public exploit code available and no vendor patch available.
In h2oai/h2o-3 version 3.46.0.2, a vulnerability exists where uploading and repeatedly parsing a large GZIP file can cause a denial of service. Rated high severity (CVSS 7.5), this vulnerability is remotely exploitable, no authentication required, low attack complexity. Public exploit code available and no vendor patch available.
In h2oai/h2o-3 version 3.46.0, an endpoint exposing a custom EncryptionTool allows an attacker to encrypt any files on the target server with a key of their choosing. Rated medium severity (CVSS 6.5), this vulnerability is remotely exploitable, no authentication required, low attack complexity. Public exploit code available and no vendor patch available.
In h2oai/h2o-3 version 3.46.0, the endpoint for exporting models does not restrict the export location, allowing an attacker to export a model to any file in the server's file structure, thereby. Rated high severity (CVSS 7.1), this vulnerability is remotely exploitable, low attack complexity. Public exploit code available and no vendor patch available.
In h2oai/h2o-3 version 3.46.0.1, the `run_tool` command exposes classes in the `water.tools` package through the `ast` parser. Rated high severity (CVSS 7.5), this vulnerability is remotely exploitable, no authentication required, low attack complexity. Public exploit code available and no vendor patch available.
A vulnerability in the h2oai/h2o-3 REST API versions 3.46.0.4 allows unauthenticated remote attackers to execute arbitrary code via deserialization of untrusted data. Rated critical severity (CVSS 9.8), this vulnerability is remotely exploitable, no authentication required, low attack complexity. Public exploit code available.
A vulnerability in the `/3/ParseSetup` endpoint of h2oai/h2o-3 version 3.46.0.1 allows for a denial of service (DoS) attack. Rated high severity (CVSS 7.5), this vulnerability is remotely exploitable, no authentication required, low attack complexity. Public exploit code available and no vendor patch available.
A vulnerability in the `/3/Parse` endpoint of h2oai/h2o-3 version 3.46.0.1 allows for a denial of service (DoS) attack. Rated high severity (CVSS 7.5), this vulnerability is remotely exploitable, no authentication required, low attack complexity. Public exploit code available and no vendor patch available.
h2o is an HTTP server with support for HTTP/1.x, HTTP/2 and HTTP/3. Rated high severity (CVSS 7.5), this vulnerability is remotely exploitable, no authentication required, low attack complexity.
h2o is an HTTP server with support for HTTP/1.x, HTTP/2 and HTTP/3. Rated high severity (CVSS 7.5), this vulnerability is remotely exploitable, no authentication required, low attack complexity.
h2o is an HTTP server with support for HTTP/1.x, HTTP/2 and HTTP/3. Rated medium severity (CVSS 4.3), this vulnerability is remotely exploitable, low attack complexity. Public exploit code available.
A vulnerability, which was classified as critical, has been found in h2oai h2o-3 3.46.0.4. Rated medium severity (CVSS 6.9), this vulnerability is remotely exploitable, no authentication required, low attack complexity. Public exploit code available and no vendor patch available.
H2O.ai H2O through 3.46.0.4 allows attackers to arbitrarily set the JDBC URL, leading to deserialization attacks, file reads, and command execution. Rated critical severity (CVSS 9.1), this vulnerability is remotely exploitable, no authentication required, low attack complexity. Public exploit code available and no vendor patch available.
In h2oai/h2o-3 version 3.46.0, the `run_tool` command in the `rapids` component allows the `main` function of any class under the `water.tools` namespace to be called. Rated high severity (CVSS 7.5), this vulnerability is remotely exploitable, no authentication required, low attack complexity. Public exploit code available and no vendor patch available.
In h2oai/h2o-3 version 3.40.0.4, an exposure of sensitive information vulnerability exists due to an arbitrary system path lookup feature. Rated medium severity (CVSS 5.3), this vulnerability is remotely exploitable, no authentication required, low attack complexity. Public exploit code available and no vendor patch available.
An S3 bucket takeover vulnerability was identified in the h2oai/h2o-3 repository. Rated high severity (CVSS 7.1), this vulnerability is no authentication required, low attack complexity. Public exploit code available and no vendor patch available.
External Control of File Name or Path in h2oai/h2o-3. Rated high severity (CVSS 8.2), this vulnerability is remotely exploitable, no authentication required, low attack complexity. Public exploit code available and no vendor patch available.
h2o is an HTTP server with support for HTTP/1.x, HTTP/2 and HTTP/3. Rated high severity (CVSS 7.5), this vulnerability is remotely exploitable, no authentication required, low attack complexity. This Allocation of Resources Without Limits vulnerability could allow attackers to exhaust system resources through uncontrolled allocation.
h2o is an HTTP server with support for HTTP/1.x, HTTP/2 and HTTP/3. Rated medium severity (CVSS 6.7), this vulnerability is low attack complexity.
A Local File Inclusion (LFI) vulnerability exists in the h2o-3 REST API, allowing unauthenticated remote attackers to read arbitrary files on the server with the permissions of the user running the. Rated high severity (CVSS 7.5), this vulnerability is remotely exploitable, no authentication required, low attack complexity. Public exploit code available and no vendor patch available.
H2O included a reference to an S3 bucket that no longer existed allowing an attacker to take over the S3 bucket URL. Rated high severity (CVSS 7.1), this vulnerability is no authentication required, low attack complexity. Public exploit code available and no vendor patch available.
H2O is vulnerable to stored XSS vulnerability which can lead to a Local File Include attack. Rated medium severity (CVSS 5.4), this vulnerability is remotely exploitable, low attack complexity. Public exploit code available and no vendor patch available.
An attacker is able to gain remote code execution on a server hosting the H2O dashboard through it's POJO model import feature. Rated critical severity (CVSS 9.8), this vulnerability is remotely exploitable, no authentication required, low attack complexity. Public exploit code available and no vendor patch available.
H2O is an HTTP server. Rated high severity (CVSS 8.2), this vulnerability is remotely exploitable, no authentication required, low attack complexity.
Buffer overflow in H2O version 2.2.4 and earlier allows remote attackers to execute arbitrary code or cause a denial of service (DoS) via unspecified vectors. Rated critical severity (CVSS 9.8), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.
H2O version 2.2.3 and earlier allows remote attackers to cause a denial of service in the server via specially crafted HTTP/2 header. Rated high severity (CVSS 7.5), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.
H2O version 2.2.3 and earlier allows remote attackers to cause a denial of service in the server via unspecified vectors. Rated medium severity (CVSS 6.5), this vulnerability is remotely exploitable, low attack complexity. No vendor patch available.
Buffer overflow in H2O version 2.2.2 and earlier allows remote attackers to cause a denial-of-service in the server via unspecified vectors. Rated high severity (CVSS 7.5), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.
H2O version 2.2.2 and earlier allows remote attackers to cause a denial of service in the server via specially crafted HTTP/1 header. Rated high severity (CVSS 7.5), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.
Use-after-free vulnerability in H2O allows remote attackers to cause a denial-of-service (DoS) or obtain server certificate private keys and possibly other information. Rated critical severity (CVSS 9.1), this vulnerability is remotely exploitable, no authentication required, low attack complexity. This Use After Free vulnerability could allow attackers to access freed memory to execute arbitrary code or crash the application.
H2O versions 2.0.3 and earlier and 2.1.0-beta2 and earlier allows remote attackers to cause a denial-of-service (DoS) via format string specifiers in a template file via fastcgi, mruby, proxy,. Rated high severity (CVSS 7.5), this vulnerability is remotely exploitable, no authentication required, low attack complexity.
lib/http2/connection.c in H2O before 1.7.3 and 2.x before 2.0.0-beta5 mishandles HTTP/2 disconnection, which allows remote attackers to cause a denial of service (use-after-free and application. Rated high severity (CVSS 7.5), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.
CRLF injection vulnerability in the on_req function in lib/handler/redirect.c in H2O before 1.6.2 and 1.7.x before 1.7.0-beta3 allows remote attackers to inject arbitrary HTTP headers and conduct. Rated low severity (CVSS 3.7), this vulnerability is remotely exploitable, no authentication required. No vendor patch available.
Remote denial of service in the h2o HTTP server (all versions prior to commit 9265bdd) allows unauthenticated attackers to exhaust server memory by combining HPACK header-decompression amplification with Slowloris-style HTTP/2 stream stalling. By opening many streams that stall mid-request, an attacker forces the server to retain large volumes of amplified decoded header state, degrading or crashing the service. There is no public exploit identified at time of analysis, and the CVSS 7.5 (A:H only) reflects an availability-only impact with no confidentiality or integrity effect.
Denial of service in the h2o HTTP server (all versions prior to commit 6b5370d) allows remote unauthenticated attackers to crash the server by requesting static files whose on-stack path construction via alloca can reach ~600KB, exceeding musl libc's default 128KB pthread stack and triggering a guard-page segmentation fault. The flaw is a CWE-770 uncontrolled resource allocation issue affecting availability only (CVSS 7.5, A:H). There is no public exploit identified at time of analysis and it is not listed in CISA KEV, but exploitation is trivial where h2o is built against musl libc.
Denial of service in Quicly, the QUIC protocol library embedded in the H2O HTTP server, allows remote attackers to corrupt connection state and crash the process prior to commit 8b178e6. Quicly's packet decoder accepts Connection IDs up to 255 bytes (permitted for unknown QUIC versions) but its version-1 CID buffers are only 20 bytes, and the library - unlike its bundled CLI - never rejected over-length CIDs, letting an oversized CID overrun the buffer within its allocated chunk and trigger assertion failures. No public exploit is identified at time of analysis, and the flaw is not listed in CISA KEV.
Remote denial of service in quicly, the IETF QUIC implementation used by the H2O HTTP server, allows unauthenticated attackers to crash the process by sending more than 32KB of valid handshake messages over the CRYPTO stream within a single packet number space, tripping a reachable assertion (CWE-617). Affects all builds prior to commit 937d0e9. No public exploit identified at time of analysis and the flaw is not in CISA KEV, but the network-reachable, no-privilege nature makes it trivially triggerable once understood.
Memory exhaustion in Quicly's QUIC flow control handling allows an unauthenticated remote peer to force disproportionate receive buffer allocation in the H2O HTTP server by sending STREAM frames containing a single byte placed at the maximum permitted stream offset. The library pre-allocates buffers up to the largest received offset to accommodate out-of-order delivery, so a handful of crafted packets can cause the server to allocate memory far exceeding what the transferred data warrants. Under H2O's default stream concurrency settings, this attack multiplies per-connection memory usage by roughly 4x, making memory exhaustion achievable at low bandwidth cost. No public exploit identified at time of analysis; EPSS is 0.25% (16th percentile) and CISA SSVC lists exploitation as 'none', suggesting no observed real-world abuse.
Remote unauthenticated denial of service in the h2o HTTP server (all versions prior to commit edd7a120bfc4af11ac0cbebce2a43cc1f93f9af1) allows an attacker to crash the server by sending a crafted QPACK instruction over HTTP/3. The flaw causes lib/http3/qpack.c to allocate an ~800 KB on-stack buffer via alloca, overflowing the default musl libc pthread stack and segfaulting on the guard page. No public exploit identified at time of analysis, and the issue is not listed in CISA KEV; impact is limited to availability with no data exposure.
Denial of service against HTTP/2 server implementations allows remote unauthenticated attackers to exhaust server resources by rapidly opening and immediately canceling (RST_STREAM) large numbers of streams over a single connection, a technique dubbed the 'Rapid Reset' attack. The flaw is confirmed actively exploited (CISA KEV) following large-scale weaponization observed August through October 2023, with publicly available exploit code and an EPSS score of 94.45% placing it in the 100th percentile for likelihood of exploitation. Virtually every major HTTP/2 stack - including nghttp2, Netty, Envoy, and Eclipse Jetty - is affected.
Stack exhaustion in the Picotls minicrypto backend's custom ASN.1 validator allows an attacker who can supply crafted private-key material to crash any application that calls ptls_minicrypto_load_private_key() or the public ptls_asn1_validation() API on untrusted DER input. All Picotls versions prior to upstream commit c14231d80 are affected when the minicrypto backend is in use; applications using the libcrypto (OpenSSL) backend are immune because OpenSSL performs its own bounded DER parsing. No public exploit has been identified and no CISA KEV listing exists; CVSS 5.5 reflects a local, user-interaction-dependent denial-of-service with no code execution potential.
Denial-of-service via malformed TLS/QUIC ClientHello in h2o HTTP server allows remote unauthenticated attackers to crash the server process by sending a zero-length SNI extension. The hostname-copy routine assumes NULL-termination on the empty SNI buffer (CWE-125 out-of-bounds read), reading beyond the allocation boundary and triggering a segmentation fault. No public exploit or active exploitation (CISA KEV) has been identified; the fix is available as an upstream commit but no confirmed tagged release exists at time of analysis.
Stateless reset injection in Quicly, the IETF QUIC implementation embedded in the H2O HTTP server, allows an on-path network attacker to abruptly terminate any active QUIC connection by sending an all-zero packet. The root cause is that Quicly zero-initializes its four stateless reset token slots but never validates which slots hold legitimate peer-advertised tokens, causing the all-zero default to be accepted as a valid reset signal whenever the peer has advertised fewer than four tokens. No public exploit code or active exploitation has been identified at time of analysis; however, the attack is mechanically straightforward for any adversary already positioned on the network path.
Quicly, an IETF QUIC protocol implementation, is susceptible to a denial-of-service attack prior to commit d9d3df6a8530a102b57d840e39b0311ce5c9e14e. A remote attacker can exploit these bugs to trigger an assertion failure that crashes process using Quicly. [CVSS 7.5 HIGH]
A vulnerability has been found in h2oai h2o-3 up to 3.46.08. Rated medium severity (CVSS 5.3), this vulnerability is remotely exploitable, low attack complexity. Public exploit code available and no vendor patch available.
A flaw has been found in h2oai h2o-3 up to 3.46.08. Rated medium severity (CVSS 5.3), this vulnerability is remotely exploitable, low attack complexity. Public exploit code available and no vendor patch available.
A deserialization vulnerability exists in h2oai/h2o-3 versions <= 3.46.0.8, allowing attackers to read arbitrary system files and execute arbitrary code. Rated critical severity (CVSS 9.8), this vulnerability is remotely exploitable, no authentication required, low attack complexity. Public exploit code available.
In h2oai/h2o-3 version 3.46.0, the `/99/Models/{name}/json` endpoint allows for arbitrary file overwrite on the target server. Rated high severity (CVSS 8.2), this vulnerability is remotely exploitable, no authentication required, low attack complexity. Public exploit code available and no vendor patch available.
A vulnerability in the typeahead endpoint of h2oai/h2o-3 version 3.46.0 allows for a denial of service. Rated high severity (CVSS 7.5), this vulnerability is remotely exploitable, no authentication required, low attack complexity. Public exploit code available and no vendor patch available.
A vulnerability in the `/3/ImportFiles` endpoint of h2oai/h2o-3 version 3.46.1 allows an attacker to cause a denial of service. Rated high severity (CVSS 7.5), this vulnerability is remotely exploitable, no authentication required, low attack complexity. Public exploit code available and no vendor patch available.
In h2oai/h2o-3 version 3.46.0.2, a vulnerability exists where uploading and repeatedly parsing a large GZIP file can cause a denial of service. Rated high severity (CVSS 7.5), this vulnerability is remotely exploitable, no authentication required, low attack complexity. Public exploit code available and no vendor patch available.
In h2oai/h2o-3 version 3.46.0, an endpoint exposing a custom EncryptionTool allows an attacker to encrypt any files on the target server with a key of their choosing. Rated medium severity (CVSS 6.5), this vulnerability is remotely exploitable, no authentication required, low attack complexity. Public exploit code available and no vendor patch available.
In h2oai/h2o-3 version 3.46.0, the endpoint for exporting models does not restrict the export location, allowing an attacker to export a model to any file in the server's file structure, thereby. Rated high severity (CVSS 7.1), this vulnerability is remotely exploitable, low attack complexity. Public exploit code available and no vendor patch available.
In h2oai/h2o-3 version 3.46.0.1, the `run_tool` command exposes classes in the `water.tools` package through the `ast` parser. Rated high severity (CVSS 7.5), this vulnerability is remotely exploitable, no authentication required, low attack complexity. Public exploit code available and no vendor patch available.
A vulnerability in the h2oai/h2o-3 REST API versions 3.46.0.4 allows unauthenticated remote attackers to execute arbitrary code via deserialization of untrusted data. Rated critical severity (CVSS 9.8), this vulnerability is remotely exploitable, no authentication required, low attack complexity. Public exploit code available.
A vulnerability in the `/3/ParseSetup` endpoint of h2oai/h2o-3 version 3.46.0.1 allows for a denial of service (DoS) attack. Rated high severity (CVSS 7.5), this vulnerability is remotely exploitable, no authentication required, low attack complexity. Public exploit code available and no vendor patch available.
A vulnerability in the `/3/Parse` endpoint of h2oai/h2o-3 version 3.46.0.1 allows for a denial of service (DoS) attack. Rated high severity (CVSS 7.5), this vulnerability is remotely exploitable, no authentication required, low attack complexity. Public exploit code available and no vendor patch available.
h2o is an HTTP server with support for HTTP/1.x, HTTP/2 and HTTP/3. Rated high severity (CVSS 7.5), this vulnerability is remotely exploitable, no authentication required, low attack complexity.
h2o is an HTTP server with support for HTTP/1.x, HTTP/2 and HTTP/3. Rated high severity (CVSS 7.5), this vulnerability is remotely exploitable, no authentication required, low attack complexity.
h2o is an HTTP server with support for HTTP/1.x, HTTP/2 and HTTP/3. Rated medium severity (CVSS 4.3), this vulnerability is remotely exploitable, low attack complexity. Public exploit code available.
A vulnerability, which was classified as critical, has been found in h2oai h2o-3 3.46.0.4. Rated medium severity (CVSS 6.9), this vulnerability is remotely exploitable, no authentication required, low attack complexity. Public exploit code available and no vendor patch available.
H2O.ai H2O through 3.46.0.4 allows attackers to arbitrarily set the JDBC URL, leading to deserialization attacks, file reads, and command execution. Rated critical severity (CVSS 9.1), this vulnerability is remotely exploitable, no authentication required, low attack complexity. Public exploit code available and no vendor patch available.
In h2oai/h2o-3 version 3.46.0, the `run_tool` command in the `rapids` component allows the `main` function of any class under the `water.tools` namespace to be called. Rated high severity (CVSS 7.5), this vulnerability is remotely exploitable, no authentication required, low attack complexity. Public exploit code available and no vendor patch available.
In h2oai/h2o-3 version 3.40.0.4, an exposure of sensitive information vulnerability exists due to an arbitrary system path lookup feature. Rated medium severity (CVSS 5.3), this vulnerability is remotely exploitable, no authentication required, low attack complexity. Public exploit code available and no vendor patch available.
An S3 bucket takeover vulnerability was identified in the h2oai/h2o-3 repository. Rated high severity (CVSS 7.1), this vulnerability is no authentication required, low attack complexity. Public exploit code available and no vendor patch available.
External Control of File Name or Path in h2oai/h2o-3. Rated high severity (CVSS 8.2), this vulnerability is remotely exploitable, no authentication required, low attack complexity. Public exploit code available and no vendor patch available.
h2o is an HTTP server with support for HTTP/1.x, HTTP/2 and HTTP/3. Rated high severity (CVSS 7.5), this vulnerability is remotely exploitable, no authentication required, low attack complexity. This Allocation of Resources Without Limits vulnerability could allow attackers to exhaust system resources through uncontrolled allocation.
h2o is an HTTP server with support for HTTP/1.x, HTTP/2 and HTTP/3. Rated medium severity (CVSS 6.7), this vulnerability is low attack complexity.
A Local File Inclusion (LFI) vulnerability exists in the h2o-3 REST API, allowing unauthenticated remote attackers to read arbitrary files on the server with the permissions of the user running the. Rated high severity (CVSS 7.5), this vulnerability is remotely exploitable, no authentication required, low attack complexity. Public exploit code available and no vendor patch available.
H2O included a reference to an S3 bucket that no longer existed allowing an attacker to take over the S3 bucket URL. Rated high severity (CVSS 7.1), this vulnerability is no authentication required, low attack complexity. Public exploit code available and no vendor patch available.
H2O is vulnerable to stored XSS vulnerability which can lead to a Local File Include attack. Rated medium severity (CVSS 5.4), this vulnerability is remotely exploitable, low attack complexity. Public exploit code available and no vendor patch available.
An attacker is able to gain remote code execution on a server hosting the H2O dashboard through it's POJO model import feature. Rated critical severity (CVSS 9.8), this vulnerability is remotely exploitable, no authentication required, low attack complexity. Public exploit code available and no vendor patch available.
H2O is an HTTP server. Rated high severity (CVSS 8.2), this vulnerability is remotely exploitable, no authentication required, low attack complexity.
Buffer overflow in H2O version 2.2.4 and earlier allows remote attackers to execute arbitrary code or cause a denial of service (DoS) via unspecified vectors. Rated critical severity (CVSS 9.8), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.
H2O version 2.2.3 and earlier allows remote attackers to cause a denial of service in the server via specially crafted HTTP/2 header. Rated high severity (CVSS 7.5), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.
H2O version 2.2.3 and earlier allows remote attackers to cause a denial of service in the server via unspecified vectors. Rated medium severity (CVSS 6.5), this vulnerability is remotely exploitable, low attack complexity. No vendor patch available.
Buffer overflow in H2O version 2.2.2 and earlier allows remote attackers to cause a denial-of-service in the server via unspecified vectors. Rated high severity (CVSS 7.5), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.
H2O version 2.2.2 and earlier allows remote attackers to cause a denial of service in the server via specially crafted HTTP/1 header. Rated high severity (CVSS 7.5), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.
Use-after-free vulnerability in H2O allows remote attackers to cause a denial-of-service (DoS) or obtain server certificate private keys and possibly other information. Rated critical severity (CVSS 9.1), this vulnerability is remotely exploitable, no authentication required, low attack complexity. This Use After Free vulnerability could allow attackers to access freed memory to execute arbitrary code or crash the application.
H2O versions 2.0.3 and earlier and 2.1.0-beta2 and earlier allows remote attackers to cause a denial-of-service (DoS) via format string specifiers in a template file via fastcgi, mruby, proxy,. Rated high severity (CVSS 7.5), this vulnerability is remotely exploitable, no authentication required, low attack complexity.
lib/http2/connection.c in H2O before 1.7.3 and 2.x before 2.0.0-beta5 mishandles HTTP/2 disconnection, which allows remote attackers to cause a denial of service (use-after-free and application. Rated high severity (CVSS 7.5), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.
CRLF injection vulnerability in the on_req function in lib/handler/redirect.c in H2O before 1.6.2 and 1.7.x before 1.7.0-beta3 allows remote attackers to inject arbitrary HTTP headers and conduct. Rated low severity (CVSS 3.7), this vulnerability is remotely exploitable, no authentication required. No vendor patch available.