NULL pointer dereference in OpenSSL - CVE-2026-42767

Vulnerability identifier: #VU134282

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-2026-42767

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 NULL pointer dereference in CRMF EncryptedValue decryption when processing a crafted CMP response containing an EncryptedValue structure with an algorithm OID but no parameters field. A remote attacker can send a crafted CMP response to cause a denial of service.

The issue can be triggered by an attacker-controlled CMP server or a man-in-the-middle.

OpenSSL
Debian Linux
SUSE Linux Enterprise Server 15 SP6
SUSE Linux Enterprise Server 15 SP5
SUSE Linux Enterprise Server 15 SP4
SUSE Linux Enterprise High Performance Computing 15
SUSE Linux Enterprise High Performance Computing ESPOS 15
SUSE Linux Enterprise High Performance Computing LTSS 15
SUSE Linux Enterprise Server 15
SUSE Linux Enterprise Server for SAP Applications 15
SUSE Linux Enterprise Desktop 15
SUSE Linux Enterprise Real Time 15
SUSE Linux Enterprise Micro for Rancher
SUSE Linux Enterprise Micro
SUSE Linux Micro
IBM i
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
Ubuntu
Basesystem Module
openSUSE Leap
openEuler
IBM Cloud Pak for Data System
IBM MQ Operator
IBM MQ for HPE NonStop
IBM MQ
IBM Cloud Pak System
OS Image for Red Hat Enterprise Linux
IBM supplied MQ Advanced container images
Operator for PostgreSQL
LANTIME Operating System Firmware (LTOS)
EntireX
openssl (Ubuntu package)
libopenssl3-64bit-debuginfo
openssl-3-doc
libopenssl-3-devel-64bit
libopenssl-3-devel
openssl-3
openssl-3-debuginfo
openssl-3-debugsource
libopenssl3
libopenssl3-debuginfo
libopenssl3-64bit
libopenssl3-32bit-debuginfo
libopenssl-3-devel-32bit
libopenssl3-32bit
openssl-debugsource
openssl
openssl-debuginfo
openssl-help
openssl-perl
openssl-libs
openssl-devel
openssl (Debian package)
libopenssl-3-fips-provider
libopenssl-3-fips-provider-debuginfo
libopenssl-3-fips-provider-64bit-debuginfo
libopenssl-3-fips-provider-64bit
libopenssl-3-fips-provider-32bit-debuginfo
libopenssl-3-fips-provider-32bit
openssl (Red Hat package)
openssl3
edk2-debugsource
edk2
edk2-debuginfo
edk2-devel
edk2-aarch64
edk2-help
edk2-ovmf
python3-edk2-devel

Install security update from vendor's website.

OpenSSL - addressed in versions 3.0.21, 3.4.6, 3.5.7, 3.6.3, 4.0.1
IBM Cloud Pak for Data System - update to 8.10.26.07.SP3
IBM Cloud Pak System - update to 2.3.6.2
IBM MQ Operator - addressed in versions 3.2.26 SC2, 4.0.1 SC2
OS Image for Red Hat Enterprise Linux - update to 5.0.3.0
LANTIME Operating System Firmware (LTOS) - update to 7.10.013
IBM MQ for HPE NonStop - update to 8.1.0.41
IBM MQ - addressed in versions 9.1.0.38, 9.2.0.44, 9.3.0.42, 9.4.0.26, 10.0.0.5
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 1.0.1f-1ubuntu2.27+esm14, 1.0.2g-1ubuntu4.20+esm16, 1.0.2n-1ubuntu5.13+esm5, 1.1.1f-1ubuntu2.24+esm4, 1.1.1-1ubuntu2.1~18.04.23+esm9, 3.0.2-0ubuntu1.25, 3.0.13-0ubuntu3.11, 3.5.3-1ubuntu3.4, 3.5.5-1ubuntu3.2
libopenssl3-64bit-debuginfo - addressed in versions 3.0.8-150400.4.90.1, 3.0.8-150500.5.69.1, 3.1.4-150600.5.56.1
openssl-3-doc - addressed in versions 3.0.8-150400.4.90.1, 3.0.8-150500.5.69.1, 3.1.4-150600.5.56.1
libopenssl-3-devel-64bit - addressed in versions 3.0.8-150400.4.90.1, 3.0.8-150500.5.69.1, 3.1.4-150600.5.56.1
libopenssl-3-devel - addressed in versions 3.0.8-150400.4.90.1, 3.0.8-150500.5.69.1, 3.1.4-15.1, 3.1.4-150600.5.56.1, 3.2.3-150700.5.36.1
openssl-3 - addressed in versions 3.0.8-150400.4.90.1, 3.0.8-150500.5.69.1, 3.1.4-15.1, 3.1.4-150600.5.56.1, 3.2.3-150700.5.36.1
openssl-3-debuginfo - addressed in versions 3.0.8-150400.4.90.1, 3.0.8-150500.5.69.1, 3.1.4-15.1, 3.1.4-150600.5.56.1, 3.2.3-150700.5.36.1
openssl-3-debugsource - addressed in versions 3.0.8-150400.4.90.1, 3.0.8-150500.5.69.1, 3.1.4-15.1, 3.1.4-150600.5.56.1, 3.2.3-150700.5.36.1
libopenssl3 - addressed in versions 3.0.8-150400.4.90.1, 3.0.8-150500.5.69.1, 3.1.4-15.1, 3.1.4-150600.5.56.1, 3.2.3-150700.5.36.1
libopenssl3-debuginfo - addressed in versions 3.0.8-150400.4.90.1, 3.0.8-150500.5.69.1, 3.1.4-15.1, 3.1.4-150600.5.56.1, 3.2.3-150700.5.36.1
libopenssl3-64bit - addressed in versions 3.0.8-150400.4.90.1, 3.0.8-150500.5.69.1, 3.1.4-150600.5.56.1
libopenssl3-32bit-debuginfo - addressed in versions 3.0.8-150400.4.90.1, 3.0.8-150500.5.69.1, 3.1.4-150600.5.56.1, 3.2.3-150700.5.36.1
libopenssl-3-devel-32bit - addressed in versions 3.0.8-150400.4.90.1, 3.0.8-150500.5.69.1, 3.1.4-150600.5.56.1
libopenssl3-32bit - addressed in versions 3.0.8-150400.4.90.1, 3.0.8-150500.5.69.1, 3.1.4-150600.5.56.1, 3.2.3-150700.5.36.1
openssl-debugsource - update to 3.0.12-52
openssl - update to 3.0.12-52
openssl-debuginfo - update to 3.0.12-52
openssl-help - update to 3.0.12-52
openssl-perl - update to 3.0.12-52
openssl-libs - update to 3.0.12-52
openssl-devel - update to 3.0.12-52
openssl (Debian package) - addressed in versions 3.0.20-1~deb12u2, 3.5.6-1~deb13u2
libopenssl-3-fips-provider - addressed in versions 3.1.4-15.1, 3.1.4-150600.5.56.1, 3.2.3-150700.5.36.1
libopenssl-3-fips-provider-debuginfo - addressed in versions 3.1.4-15.1, 3.1.4-150600.5.56.1, 3.2.3-150700.5.36.1
libopenssl-3-fips-provider-64bit-debuginfo - update to 3.1.4-150600.5.56.1
libopenssl-3-fips-provider-64bit - update to 3.1.4-150600.5.56.1
libopenssl-3-fips-provider-32bit-debuginfo - addressed in versions 3.1.4-150600.5.56.1, 3.2.3-150700.5.36.1
libopenssl-3-fips-provider-32bit - addressed in versions 3.1.4-150600.5.56.1, 3.2.3-150700.5.36.1
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
edk2-debugsource - addressed in versions 202308-41, 202308-45
edk2 - addressed in versions 202308-41, 202308-45
edk2-debuginfo - addressed in versions 202308-41, 202308-45
edk2-devel - addressed in versions 202308-41, 202308-45
edk2-aarch64 - addressed in versions 202308-41, 202308-45
edk2-help - addressed in versions 202308-41, 202308-45
edk2-ovmf - addressed in versions 202308-41, 202308-45
python3-edk2-devel - addressed in versions 202308-41, 202308-45

• https://openssl-library.org/news/secadv/20260609.txt

• Multiple vulnerabilities in OpenSSL
• Debian update for openssl
• Ubuntu update for openssl
• Ubuntu update for openssl
• Fedora 44 update for openssl
• Red Hat Enterprise Linux 10 update for openssl
• Red Hat Enterprise Linux 9 update for openssl
• FreeBSd update for OpenSSL
• openEuler 24.03 LTS SP3 update for openssl
• openEuler 24.03 LTS SP1 update for openssl
• SUSE update for openssl-3
• Multiple vulnerabilities in IBM Operator for PostgreSQL
• SUSE update for openssl-3
• Multiple vulnerabilities in IBM EntireX
• Multiple vulnerabilities in IBM MQ Operator and Queue manager container images
• Multiple vulnerabilities in IBM i
• SUSE update for openssl-3
• SUSE update for openssl-3
• SUSE update for openssl-3
• openEuler 24.03 LTS SP1 update for edk2
• openEuler 24.03 LTS SP4 update for edk2
• openEuler 24.03 LTS SP3 update for edk2
• Fedora EPEL 8 update for openssl3
• Multiple vulnerabilities in Meinberg LANTIME firmware
• Multiple vulnerabilities in IBM Cloud Pak for Data System
• Multiple vulnerabilities in IBM MQ
• Multiple vulnerabilities in IBM MQ for HPE NonStop
• Multiple vulnerabilities in IBM Cloud Pak System