NULL pointer dereference in OpenSSL - CVE-2026-63076

Vulnerability identifier: #VU145418

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-2026-63076

CWE-ID: CWE-476

Exploitation vector: Remote access

Exploit availability: No public exploit available

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

The vulnerability exists due to improper type validation leading to invalid pointer dereference in OpenSSL CMP password-based protection verification when processing a crafted protectionAlg parameter in a CMP message. A remote attacker can send a specially crafted CMP message to cause a denial of service.

CMP is a specialized feature that must be explicitly enabled, and on the client side exploitation is possible when communicating with a malicious or on-path CMP server.

OpenSSL
Debian Linux
SUSE Linux Enterprise Server 15 SP4
SUSE Linux Enterprise Server 15 SP5
SUSE Linux Enterprise Server 15 SP6
SUSE Linux Enterprise Server 15
SUSE Linux Enterprise High Performance Computing LTSS 15
SUSE Linux Enterprise High Performance Computing ESPOS 15
SUSE Linux Enterprise High Performance Computing 15
SUSE Linux Enterprise Server for SAP Applications 15
SUSE Linux Enterprise Real Time 15
SUSE Linux Enterprise Desktop 15
SUSE Linux Enterprise Micro
SUSE Linux Enterprise Micro for Rancher
IBM i
FreeBSD
SUSE Linux Enterprise Live Patching
Basesystem Module
openSUSE Leap
Ubuntu
Anolis OS
openEuler
openssl-3-livepatches-debuginfo
openssl-3-livepatches-debugsource
openssl-3-livepatches
openssl (Ubuntu package)
libopenssl-3-devel
libopenssl3-debuginfo
openssl-3-debugsource
libopenssl3
openssl-3
openssl-3-debuginfo
libopenssl3-32bit
libopenssl3-32bit-debuginfo
libopenssl-3-devel-32bit
libopenssl-3-devel-64bit
libopenssl3-64bit-debuginfo
openssl-3-doc
libopenssl3-64bit
openssl-libs
openssl-devel
openssl
openssl-doc
openssl-perl
openssl-debugsource
openssl-debuginfo
openssl-help
libopenssl-3-fips-provider-debuginfo
libopenssl-3-fips-provider-32bit-debuginfo
libopenssl-3-fips-provider-32bit
libopenssl-3-fips-provider
libopenssl-3-fips-provider-64bit
libopenssl-3-fips-provider-64bit-debuginfo
openssl (Debian package)
python3-edk2-devel
edk2-ovmf
edk2-help
edk2-aarch64
edk2-devel
edk2-debugsource
edk2-debuginfo
edk2

Install security update from vendor's website.

OpenSSL - addressed in versions 3.0.22, 3.4.7, 3.5.8, 3.6.4, 4.0.2
openssl-3-livepatches-debuginfo - addressed in versions 0.6-150600.13.19.1, 0.6-150700.16.12.1
openssl-3-livepatches-debugsource - addressed in versions 0.6-150600.13.19.1, 0.6-150700.16.12.1
openssl-3-livepatches - addressed in versions 0.6-150600.13.19.1, 0.6-150700.16.12.1
openssl (Ubuntu package) - addressed in versions 3.0.2-0ubuntu1.29, 3.0.13-0ubuntu3.15, 3.5.5-1ubuntu3.4, 3.5.5-1ubuntu3.5
libopenssl-3-devel - addressed in versions 3.0.8-150400.4.98.1, 3.0.8-150500.5.75.1, 3.1.4-150600.5.64.1, 3.5.0-150700.5.50.1
libopenssl3-debuginfo - addressed in versions 3.0.8-150400.4.98.1, 3.0.8-150500.5.75.1, 3.1.4-150600.5.64.1, 3.5.0-150700.5.50.1
openssl-3-debugsource - addressed in versions 3.0.8-150400.4.98.1, 3.0.8-150500.5.75.1, 3.1.4-150600.5.64.1, 3.5.0-150700.5.50.1
libopenssl3 - addressed in versions 3.0.8-150400.4.98.1, 3.0.8-150500.5.75.1, 3.1.4-150600.5.64.1, 3.5.0-150700.5.50.1
openssl-3 - addressed in versions 3.0.8-150400.4.98.1, 3.0.8-150500.5.75.1, 3.1.4-150600.5.64.1, 3.5.0-150700.5.50.1
openssl-3-debuginfo - addressed in versions 3.0.8-150400.4.98.1, 3.0.8-150500.5.75.1, 3.1.4-150600.5.64.1, 3.5.0-150700.5.50.1
libopenssl3-32bit - addressed in versions 3.0.8-150400.4.98.1, 3.0.8-150500.5.75.1, 3.1.4-150600.5.64.1, 3.5.0-150700.5.50.1
libopenssl3-32bit-debuginfo - addressed in versions 3.0.8-150400.4.98.1, 3.0.8-150500.5.75.1, 3.1.4-150600.5.64.1, 3.5.0-150700.5.50.1
libopenssl-3-devel-32bit - addressed in versions 3.0.8-150400.4.98.1, 3.0.8-150500.5.75.1, 3.1.4-150600.5.64.1
libopenssl-3-devel-64bit - addressed in versions 3.0.8-150400.4.98.1, 3.0.8-150500.5.75.1, 3.1.4-150600.5.64.1
libopenssl3-64bit-debuginfo - addressed in versions 3.0.8-150400.4.98.1, 3.0.8-150500.5.75.1, 3.1.4-150600.5.64.1
openssl-3-doc - addressed in versions 3.0.8-150400.4.98.1, 3.0.8-150500.5.75.1, 3.1.4-150600.5.64.1
libopenssl3-64bit - addressed in versions 3.0.8-150400.4.98.1, 3.0.8-150500.5.75.1, 3.1.4-150600.5.64.1
openssl-libs - update to 3.0.12-31
openssl-devel - update to 3.0.12-31
openssl - update to 3.0.12-31
openssl-doc - update to 3.0.12-31
openssl-perl - update to 3.0.12-31
openssl-debugsource - addressed in versions 3.0.12-53, 3.5.6-7
openssl-debuginfo - addressed in versions 3.0.12-53, 3.5.6-7
openssl - addressed in versions 3.0.12-53, 3.5.6-7
openssl-help - addressed in versions 3.0.12-53, 3.5.6-7
openssl-perl - addressed in versions 3.0.12-53, 3.5.6-7
openssl-libs - addressed in versions 3.0.12-53, 3.5.6-7
openssl-devel - addressed in versions 3.0.12-53, 3.5.6-7
libopenssl-3-fips-provider-debuginfo - addressed in versions 3.1.4-150600.5.64.1, 3.5.0-150700.5.50.1
libopenssl-3-fips-provider-32bit-debuginfo - addressed in versions 3.1.4-150600.5.64.1, 3.5.0-150700.5.50.1
libopenssl-3-fips-provider-32bit - addressed in versions 3.1.4-150600.5.64.1, 3.5.0-150700.5.50.1
libopenssl-3-fips-provider - addressed in versions 3.1.4-150600.5.64.1, 3.5.0-150700.5.50.1
libopenssl-3-fips-provider-64bit - update to 3.1.4-150600.5.64.1
libopenssl-3-fips-provider-64bit-debuginfo - update to 3.1.4-150600.5.64.1
openssl (Debian package) - update to 3.5.7-1~deb13u2
python3-edk2-devel - addressed in versions 202308-44, 202308-49, 202308-52
edk2-ovmf - addressed in versions 202308-44, 202308-49, 202308-52
edk2-help - addressed in versions 202308-44, 202308-49, 202308-52
edk2-aarch64 - addressed in versions 202308-44, 202308-49, 202308-52
edk2-devel - addressed in versions 202308-44, 202308-49, 202308-52
edk2-debugsource - addressed in versions 202308-44, 202308-49, 202308-52
edk2-debuginfo - addressed in versions 202308-44, 202308-49, 202308-52
edk2 - addressed in versions 202308-44, 202308-49, 202308-52

• https://openssl-library.org/news/secadv/20260825.txt

• Multiple vulnerabilities in OpenSSL
• Debian update for openssl
• FreeBSD update for OpenSSL
• Ubuntu update for openssl
• SUSE update for openssl-3
• Ubuntu update for openssl
• SUSE update for openssl-3
• openEuler 24.03 LTS SP3 update for openssl
• openEuler 24.03 LTS SP1 update for openssl
• SUSE update for openssl-3
• SUSE update for openssl-3-livepatches
• SUSE update for openssl-3
• SUSE update for openssl-3-livepatches
• openEuler 24.03 LTS SP4 update for edk2
• openEuler 24.03 LTS SP3 update for edk2
• openEuler 24.03 LTS SP4 update for openssl
• openEuler 24.03 LTS SP1 update for edk2
• Anolis OS update for openssl
• Multiple vulnerabilities in IBM i