Skip to main content

Apache Tomcat Native EUVDEUVD-2026-85267

| CVE-2026-86243 HIGH
Buffer Over-read (CWE-126)
2026-09-23 apache GHSA-w68h-fc49-cmrg
Buffer Overflow Denial Of Service Apache Tomcat Suse Apache Tomcat Native Apache Software Foundation
7.5
CVSS 3.1 · Vendor: apache
Share

Severity by source

Vendor (apache) PRIMARY
7.5 HIGH
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
vuln.today AI
7.5 HIGH

Remote unauthenticated attacker triggers the over-read during the TLS handshake with low complexity (AV:N/AC:L/PR:N/UI:N); impact is a JVM crash so A:H only, C:N/I:N.

3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
4.0 AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
SUSE
HIGH
qualitative

Primary rating from Vendor (apache).

CVSS VectorVendor: apache

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

Lifecycle Timeline

4
CVSS changed
Sep 23, 2026 - 16:22 NVD
7.5 (HIGH)
Metadata Corrected
Sep 23, 2026 - 13:40 vuln.today
tag: Denial Of Service added
Analysis Generated
Sep 23, 2026 - 13:01 vuln.today
CVE Published
Sep 23, 2026 - 12:24 cve.org
HIGH

DescriptionCVE.org

Buffer over-read vulnerability in Apache Tomcat Native during the TLS handshake permits a malicious user to trigger a DoS via a JVM crash.

This issue affects Apache Tomcat Native: from 2.0.0 through 2.0.15, from 1.3.0 through 1.3.8. Earlier, unsupported versions may also be affected.

Users are recommended to upgrade to version 1.3.9 or 2.0.16, which fix the issue.

AnalysisAI

Denial of service via JVM crash affects Apache Tomcat Native versions 2.0.0 through 2.0.15 and 1.3.0 through 1.3.8, where a buffer over-read (CWE-126) during the TLS handshake lets a malicious client terminate the server process, rated CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H. The flaw is reachable remotely and unauthenticated with no user interaction, but only where the APR/OpenSSL-based native TLS connector is actually deployed and handling TLS connections; Tomcat instances using the pure-Java JSSE/NIO connector are not affected. …

Unlock full vulnerability intelligence

  • Risk assessment & exploitation conditions
  • Attack chain visualization
  • Remediation with exact patch versions
  • Threat intelligence from 22 sources
  • Personal watchlist & email alerts
Continue with Google Continue with GitHub

No credit card · 7-day full trial

Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
technique details hidden
Delivery
technique details hidden
Exploit
technique details hidden
Execution
technique details hidden
Impact
technique details hidden
Sign in to reveal

Vulnerability AssessmentAI

Exploitation Exploitable only when Apache Tomcat Native (the APR/OpenSSL-based TLS implementation) is deployed and handling TLS connections for Tomcat - deployments using the pure-Java JSSE/NIO connector are not affected. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment This is a denial-of-service-only flaw (JVM crash) with no confidentiality or integrity impact, disclosed by the Apache Software Foundation via its own security mailing list. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario Full exploit scenario with step-by-step reproduction available after sign-in.
Remediation Upgrade Apache Tomcat Native to version 1.3.9 (1.3.x branch) or 2.0.16 (2.0.x branch), which the vendor states fix the issue; these are the only confirmed patched releases, so any 1.3.x or 2.0.x build below those levels - including the listed ranges 1.3.0-1.3.8 and 2.0.0-2.0.15 and earlier unsupported versions - should be treated as vulnerable. … Detailed patch versions, workarounds, and compensating controls in full report.
Sign in to read full assessment

Recommended ActionAI

Within 24 hours, inventory every Tomcat instance to determine whether tomcat-native versions 2.0.0-2.0.15 or 1.3.0-1.3.8 are installed and whether the APR/OpenSSL-based native TLS connector is actually enabled and terminating TLS (check server.xml for connectors configured with Http11AprProtocol or the OpenSSL-backed TLS implementation); where the native TLS connector is not required, disable it and move affected instances to the pure-Java JSSE/NIO connector, and where it must remain, restrict inbound access to the TLS ports (typically 443/8443) to trusted networks and enable process supervision with automatic restart plus JVM crash alerting so outages are detected and shortened. …

Sign in for detailed remediation steps and compensating controls.

Threat intelligence, references, and detailed analysis are available after sign-in.

More in Tomcat

View all
CVE-2017-12617 HIGH POC
8.1 Oct 04

When running Apache Tomcat versions 9.0.0.M1 to 9.0.0, 8.5.0 to 8.5.22, 8.0.0.RC1 to 8.0.46 and 7.0.0 to 7.0.81 with HTT
CVE-2020-1938 CRITICAL POC
9.8 Feb 24

When using the Apache JServ Protocol (AJP), care must be taken when trusting incoming connections to Apache Tomcat. Rate
CVE-2023-47246 CRITICAL POC
9.8 Nov 10

In SysAid On-Premise before 23.3.36, a path traversal vulnerability leads to code execution after an attacker writes a f
CVE-2016-8735 CRITICAL POC
9.8 Apr 06

Remote code execution is possible with Apache Tomcat before 6.0.48, 7.x before 7.0.73, 8.x before 8.0.39, 8.5.x before 8
CVE-2017-12615 HIGH POC
8.1 Sep 19

When running Apache Tomcat 7.0.0 to 7.0.79 on Windows with HTTP PUTs enabled (e.g. Rated high severity (CVSS 8.1), this

CVE-2023-44487 HIGH POC
7.5 Oct 10

Denial of service against HTTP/2 server implementations allows remote unauthenticated attackers to exhaust server resour
CVE-2014-0050 HIGH POC
7.5 Apr 01

MultipartStream.java in Apache Commons FileUpload before 1.3.1, as used in Apache Tomcat, JBoss Web, and other products,
CVE-2020-13935 HIGH POC
7.5 Jul 14

The payload length in a WebSocket frame was not correctly validated in Apache Tomcat 10.0.0-M1 to 10.0.0-M6, 9.0.0.M1 to
CVE-2022-29885 HIGH POC
7.5 May 12

The documentation of Apache Tomcat 10.1.0-M1 to 10.1.0-M14, 10.0.0-M1 to 10.0.20, 9.0.13 to 9.0.62 and 8.5.38 to 8.5.78

CVE-2017-12616 HIGH
7.5 Sep 19

When using a VirtualDirContext with Apache Tomcat 7.0.0 to 7.0.80 it was possible to bypass security constraints and/or

CVE-2020-9484 HIGH POC
7.0 May 20

When using Apache Tomcat versions 10.0.0-M1 to 10.0.0-M4, 9.0.0.M1 to 9.0.34, 8.5.0 to 8.5.54 and 7.0.0 to 7.0.103 if a)
CVE-2014-0227 MEDIUM
6.4 Feb 16

java/org/apache/coyote/http11/filters/ChunkedInputFilter.java in Apache Tomcat 6.x before 6.0.42, 7.x before 7.0.55, and

Same weakness CWE-126 – Buffer Over-read

View all
CVE-2017-7668 HIGH
7.5
CVE-2017-7679 CRITICAL POC
9.8
CVE-2021-34584 CRITICAL POC
9.1
CVE-2022-1987 HIGH POC
8.1
CVE-2022-1908 HIGH POC
8.1
CVE-2022-1907 HIGH POC
8.1
CVE-2022-2124 HIGH POC
7.8
CVE-2022-2175 HIGH POC
7.8

Same technique Buffer Overflow

View all
CVE-2017-7269 CRITICAL POC
9.8
CVE-2015-5119 CRITICAL POC
9.8
CVE-2015-3113 CRITICAL POC
9.8
CVE-2011-2462 CRITICAL POC
9.8
CVE-2020-0796 CRITICAL POC
10.0
CVE-2019-11043 CRITICAL POC
9.8
CVE-2009-0927 HIGH POC
8.8
CVE-2012-1889 HIGH POC
8.8

Vendor StatusVendor

SUSE

Severity: Important
Product Status
SUSE Linux Enterprise Desktop 15 SP7 SUSE Linux Enterprise Module for Basesystem 15 SP7 Fixed
SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS Fixed
SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS Fixed
SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS Fixed
SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS Fixed

Share

EUVD-2026-85267 vulnerability details – vuln.today
Back

This site uses cookies essential for authentication and security. No tracking or analytics cookies are used. Privacy Policy