NULL pointer dereference in OpenSSL - CVE-2026-42764

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Main Vulnerability Database Vulnerabilities #VU134274

NULL pointer dereference in OpenSSL - CVE-2026-42764

Published: June 10, 2026


Vulnerability identifier: #VU134274
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-42764
CWE-ID: CWE-476
Exploitation vector: Remote access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to NULL pointer dereference in QUIC server initial packet handling when processing an initial packet with an invalid or expired token. A remote attacker can send a crafted initial packet to cause a denial of service.

The issue is reachable only when address validation is disabled, such as when SSL_LISTENER_FLAG_NO_VALIDATE is used with SSL_new_listener().


Affected software

OpenSSL
Debian Linux
SUSE Linux Enterprise Desktop 15
SUSE Linux Enterprise Real Time 15
SUSE Linux Enterprise Server 15
SUSE Linux Enterprise Server for SAP Applications 15
Fedora
Red Hat Enterprise Linux for ARM 64
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux for x86_64
Red Hat Enterprise Linux for Power, little endian
FreeBSD
Basesystem Module
Web and Scripting Module
Ubuntu
IBM Cloud Pak for Data System
IBM MQ Operator
Netezza Appliance
IBM supplied MQ Advanced container images
Operator for PostgreSQL
LANTIME Operating System Firmware (LTOS)
EntireX
openssl (Ubuntu package)
openssl (Debian package)
libopenssl-fips-provider
libopenssl-devel
openssl
libopenssl-3-devel
libopenssl3-32bit-debuginfo
openssl-3
libopenssl3-debuginfo
libopenssl-3-fips-provider-debuginfo
openssl-3-debuginfo
libopenssl-3-fips-provider
libopenssl3
openssl-3-debugsource
libopenssl-3-fips-provider-32bit
libopenssl3-32bit
libopenssl-3-fips-provider-32bit-debuginfo
openssl (Red Hat package)
openssl3
nodejs24-docs
nodejs24-debuginfo
npm24
nodejs24
nodejs24-debugsource
nodejs24-devel

How to mitigate CVE-2026-42764

Install security update from vendor's website.

OpenSSL - addressed in versions 3.5.7, 3.6.3, 4.0.1
IBM Cloud Pak for Data System - update to 8.10.26.07.SP3
Netezza Appliance - update to 1.0.2.0
IBM MQ Operator - addressed in versions 3.2.26 SC2, 4.0.1 SC2
LANTIME Operating System Firmware (LTOS) - update to 7.10.013
IBM supplied MQ Advanced container images - update to 10.0.0.0-r2
EntireX - update to 12.1 Fix2
openssl (Ubuntu package) - addressed in versions 3.0.2-0ubuntu1.25, 3.0.13-0ubuntu3.11, 3.5.3-1ubuntu3.4, 3.5.5-1ubuntu3.2
openssl (Debian package) - addressed in versions 3.0.20-1~deb12u2, 3.5.6-1~deb13u2
libopenssl-fips-provider - update to 3.5.0-150700.3.4.1
libopenssl-devel - update to 3.5.0-150700.3.4.1
openssl - update to 3.5.0-150700.3.4.1
libopenssl-3-devel - update to 3.5.0-150700.5.45.2
libopenssl3-32bit-debuginfo - update to 3.5.0-150700.5.45.2
openssl-3 - update to 3.5.0-150700.5.45.2
libopenssl3-debuginfo - update to 3.5.0-150700.5.45.2
libopenssl-3-fips-provider-debuginfo - update to 3.5.0-150700.5.45.2
openssl-3-debuginfo - update to 3.5.0-150700.5.45.2
libopenssl-3-fips-provider - update to 3.5.0-150700.5.45.2
libopenssl3 - update to 3.5.0-150700.5.45.2
openssl-3-debugsource - update to 3.5.0-150700.5.45.2
libopenssl-3-fips-provider-32bit - update to 3.5.0-150700.5.45.2
libopenssl3-32bit - update to 3.5.0-150700.5.45.2
libopenssl-3-fips-provider-32bit-debuginfo - update to 3.5.0-150700.5.45.2
openssl (Red Hat package) - addressed in versions 3.5.5-4.el9_8, 3.5.5-4.el10_2
openssl3 - update to 3.5.5-5.el8
openssl - update to 3.5.7-1.fc44
nodejs24-docs - update to 24.18.1-150700.15.18.1
nodejs24-debuginfo - update to 24.18.1-150700.15.18.1
npm24 - update to 24.18.1-150700.15.18.1
nodejs24 - update to 24.18.1-150700.15.18.1
nodejs24-debugsource - update to 24.18.1-150700.15.18.1
nodejs24-devel - update to 24.18.1-150700.15.18.1

External References

Related Security Bulletins