Skip to main content

OpenSSL EUVDEUVD-2026-35481

| CVE-2026-42764 HIGH
NULL Pointer Dereference (CWE-476)
7.5
CVSS 3.1 · Vendor
Share

Severity by source

Vendor (CNA) PRIMARY
7.5 HIGH
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
SUSE
5.3 MEDIUM
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Red Hat
5.9 MEDIUM
qualitative

Primary rating from Vendor (CNA).

CVSS VectorVendor

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

Lifecycle Timeline

5
Source Code Evidence Fetched
Jun 09, 2026 - 21:26 vuln.today
Analysis Generated
Jun 09, 2026 - 21:26 vuln.today
CVSS changed
Jun 09, 2026 - 21:22 NVD
7.5 (HIGH)
CVE Published
Jun 09, 2026 - 11:43 nvd
UNKNOWN (no severity yet)
CVE Published
Jun 09, 2026 - 11:43 nvd
HIGH 7.5

Description PRE-NVD

Disclosed via GitHub release of openssl/openssl. NVD scoring and full description are pending.

AnalysisAI

Denial of service in OpenSSL 3.5.x, 3.6.x, and 4.0.0 stems from a NULL pointer dereference triggered during QUIC server initial packet handling, allowing remote unauthenticated attackers to crash affected servers by sending crafted QUIC traffic. The flaw was disclosed via the OpenSSL 4.0.1 security release on 2026-06-09 alongside multiple other CVEs; no public exploit identified at time of analysis and no CISA KEV listing. Patched versions are available from the upstream project and downstream distributions including Ubuntu (USN-8414-1).

Technical ContextAI

The vulnerability resides in OpenSSL's QUIC server implementation, specifically in the code path that processes the Initial packet - the first packet sent by a client to establish a QUIC connection and which carries the TLS ClientHello inside CRYPTO frames. CWE-476 (NULL Pointer Dereference) indicates that a pointer expected to reference a valid object is accessed without first being checked, causing the process to crash. Because QUIC runs over UDP (typically port 443) and the Initial packet is processed before connection establishment completes, the dereference is reachable pre-handshake. Affected packages per CPE/EUVD data are OpenSSL 3.5.0 through versions before 3.5.7, 3.6.0 through 3.6.3, and 4.0.0 - all branches where the modern QUIC server stack is enabled.

RemediationAI

Vendor-released patches are available: upgrade to OpenSSL 3.5.7, 3.6.3, or 4.0.1 (or later) per the upstream advisory at https://openssl-library.org/news/secadv/20260609.txt and the release notes at https://github.com/openssl/openssl/releases/tag/openssl-4.0.1; the fix commits are tracked in the openssl/security repository (5e3ed29, a45a0ab, bf29a45). On Ubuntu, apply the packaged update via USN-8414-1 (https://ubuntu.com/security/notices/USN-8414-1) and restart any services linking OpenSSL (libssl). As a compensating control until patching is possible, disable the QUIC server listener or block inbound UDP to the QUIC port (typically UDP/443) at a firewall or load balancer - this eliminates the attack surface but also disables HTTP/3 and any QUIC-based services, forcing clients to fall back to TLS-over-TCP, which is acceptable for most web workloads but breaks deployments that require QUIC (low-latency, mobile, or 0-RTT use cases).

CVE-2014-0160 HIGH POC
7.5 Apr 07

The (1) TLS and (2) DTLS implementations in OpenSSL 1.0.1 before 1.0.1g do not properly handle Heartbeat Extension packe

CVE-2014-0195 MEDIUM POC
6.8 Jun 05

The dtls1_reassemble_fragment function in d1_both.c in OpenSSL before 0.9.8za, 1.0.0 before 1.0.0m, and 1.0.1 before 1.0

CVE-2014-0224 HIGH POC
7.4 Jun 05

OpenSSL before 0.9.8za, 1.0.0 before 1.0.0m, and 1.0.1 before 1.0.1h does not properly restrict processing of ChangeCiph

CVE-2016-0800 MEDIUM POC
5.9 Mar 01

The SSLv2 protocol, as used in OpenSSL before 1.0.1s and 1.0.2 before 1.0.2g and other products, requires a server to se

CVE-2015-0204 MEDIUM POC
4.3 Jan 09

The ssl3_get_key_exchange function in s3_clnt.c in OpenSSL before 0.9.8zd, 1.0.0 before 1.0.0p, and 1.0.1 before 1.0.1k

CVE-2014-3566 LOW POC
3.4 Oct 15

The SSL protocol 3.0, as used in OpenSSL through 1.0.1i and other products, uses nondeterministic CBC padding, which mak

CVE-2016-2107 MEDIUM POC
5.9 May 05

The AES-NI implementation in OpenSSL before 1.0.1t and 1.0.2 before 1.0.2h does not consider memory allocation during a

CVE-2015-1793 MEDIUM POC
6.5 Jul 09

The X509_verify_cert function in crypto/x509/x509_vfy.c in OpenSSL 1.0.1n, 1.0.1o, 1.0.2b, and 1.0.2c does not properly

CVE-2022-3602 HIGH
7.5 Nov 01

A buffer overrun can be triggered in X.509 certificate verification, specifically in name constraint checking. Rated hig

CVE-2014-3470 MEDIUM
4.3 Jun 05

The ssl3_send_client_key_exchange function in s3_clnt.c in OpenSSL before 0.9.8za, 1.0.0 before 1.0.0m, and 1.0.1 before

CVE-2017-3730 HIGH POC
7.5 May 04

In OpenSSL 1.1.0 before 1.1.0d, if a malicious server supplies bad parameters for a DHE or ECDHE key exchange then this

CVE-2016-8610 HIGH
7.5 Nov 13

A denial of service flaw was found in OpenSSL 0.9.8, 1.0.1, 1.0.2 through 1.0.2h, and 1.1.0 in the way the TLS/SSL proto

Vendor StatusVendor

SUSE

Severity: Medium
Product Status
SLES15-SP5-CHOST-BYOS-SAP-CCloud Fixed
SLES15-SP5-CHOST-BYOS-SAP-CCloud Fixed
SLES15-SP6-CHOST-BYOS Fixed
SLES15-SP6-CHOST-BYOS Fixed
SLES15-SP6-CHOST-BYOS-Aliyun Fixed

Share

EUVD-2026-35481 vulnerability details – vuln.today

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