NULL pointer dereference in OpenSSL - CVE-2026-42766

Vulnerability identifier: #VU134281

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-2026-42766

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 password-based CMS decryption when processing a specially crafted CMS message with an absent PasswordRecipientInfo.keyDerivationAlgorithm field. A remote attacker can send a specially crafted CMS message to cause a denial of service.

Applications that process password-encrypted CMS messages may be affected.

OpenSSL
SUSE Linux Enterprise Server 15 SP6
SUSE Linux Enterprise Server 15 SP5
SUSE Linux Enterprise Server 15 SP4
SUSE Linux Enterprise Server 12 SP5 LTSS Extended
Debian Linux
SUSE Linux Enterprise Server 12 SP5
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 High Performance Computing 12
SUSE Linux Enterprise Server 12
SUSE Linux Enterprise Server for SAP Applications 12
SUSE Linux Enterprise Desktop 15
SUSE Linux Enterprise Real Time 15
SUSE Linux Enterprise Micro for Rancher
SUSE Linux Enterprise Micro
IBM i
Fedora
Red Hat Enterprise Linux for ARM 64
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux for x86_64
FreeBSD
Ubuntu
Legacy Module
Development Tools Module
Basesystem Module
openSUSE Leap
openEuler
Anolis OS
IBM Cloud Pak for Data System
IBM MQ Operator
LANTIME Operating System Firmware (LTOS)
IBM supplied MQ Advanced container images
Operator for PostgreSQL
openssl (Ubuntu package)
openssl-1_0_0-debugsource
libopenssl1_0_0-debuginfo
openssl-1_0_0
libopenssl1_0_0
openssl-1_0_0-doc
libopenssl1_0_0-debuginfo-32bit
libopenssl-1_0_0-devel-32bit
libopenssl1_0_0-hmac-32bit
libopenssl1_0_0-32bit
libopenssl-1_0_0-devel
libopenssl1_0_0-hmac
openssl-1_0_0-debuginfo
libopenssl10-debuginfo
libopenssl10
libopenssl1_1-hmac
openssl-1_1-debuginfo
libopenssl1_1-32bit
libopenssl1_1-debuginfo-32bit
openssl-1_1
openssl-1_1-debugsource
libopenssl1_1-hmac-32bit
libopenssl-1_1-devel-32bit
libopenssl-1_1-devel
libopenssl1_1
libopenssl1_1-debuginfo
openssl-help
openssl-libs
openssl-devel
openssl-debugsource
openssl-debuginfo
openssl
openssl-1_1-doc
libopenssl-1_1-devel-64bit
libopenssl1_1-hmac-64bit
libopenssl1_1-64bit-debuginfo
libopenssl1_1-64bit
libopenssl1_1-32bit-debuginfo
compat-openssl11
compat-openssl11-debuginfo
compat-openssl11-debugsource
compat-openssl11-devel
compat-openssl11-libs
openssl-perl
openssl-3-debugsource
openssl-3-debuginfo
libopenssl3
openssl-3
libopenssl-3-devel
libopenssl3-debuginfo
libopenssl3-32bit
libopenssl-3-devel-32bit
libopenssl3-32bit-debuginfo
libopenssl3-64bit-debuginfo
libopenssl3-64bit
libopenssl-3-devel-64bit
openssl-3-doc
openssl-doc
openssl (Debian package)
libopenssl-3-fips-provider
libopenssl-3-fips-provider-debuginfo
libopenssl-3-fips-provider-32bit-debuginfo
libopenssl-3-fips-provider-32bit
libopenssl-3-fips-provider-64bit
libopenssl-3-fips-provider-64bit-debuginfo
openssl (Red Hat package)
openssl3
edk2-ovmf
python3-edk2-devel
edk2-help
edk2-aarch64
edk2-devel
edk2-debugsource
edk2-debuginfo
edk2
EntireX

Install security update from vendor's website.

OpenSSL - addressed in versions 1.0.2zq, 1.1.1zh, 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 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
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
openssl-1_0_0-debugsource - addressed in versions 1.0.2p-3.109.1, 1.0.2p-150000.3.108.1
libopenssl1_0_0-debuginfo - addressed in versions 1.0.2p-3.109.1, 1.0.2p-150000.3.108.1
openssl-1_0_0 - addressed in versions 1.0.2p-3.109.1, 1.0.2p-150000.3.108.1
libopenssl1_0_0 - addressed in versions 1.0.2p-3.109.1, 1.0.2p-150000.3.108.1
openssl-1_0_0-doc - update to 1.0.2p-3.109.1
libopenssl1_0_0-debuginfo-32bit - update to 1.0.2p-3.109.1
libopenssl-1_0_0-devel-32bit - update to 1.0.2p-3.109.1
libopenssl1_0_0-hmac-32bit - update to 1.0.2p-3.109.1
libopenssl1_0_0-32bit - update to 1.0.2p-3.109.1
libopenssl-1_0_0-devel - addressed in versions 1.0.2p-3.109.1, 1.0.2p-150000.3.108.1
libopenssl1_0_0-hmac - addressed in versions 1.0.2p-3.109.1, 1.0.2p-150000.3.108.1
openssl-1_0_0-debuginfo - addressed in versions 1.0.2p-3.109.1, 1.0.2p-150000.3.108.1
libopenssl10-debuginfo - update to 1.0.2p-150000.3.108.1
libopenssl10 - update to 1.0.2p-150000.3.108.1
libopenssl1_1-hmac - addressed in versions 1.1.1d-2.131.1, 1.1.1l-150400.7.96.2, 1.1.1l-150500.17.57.2
openssl-1_1-debuginfo - addressed in versions 1.1.1d-2.131.1, 1.1.1l-150400.7.96.2, 1.1.1l-150500.17.57.2, 1.1.1w-150600.5.32.1, 1.1.1w-150700.11.22.1
libopenssl1_1-32bit - addressed in versions 1.1.1d-2.131.1, 1.1.1l-150400.7.96.2, 1.1.1l-150500.17.57.2, 1.1.1w-150600.5.32.1, 1.1.1w-150700.11.22.1
libopenssl1_1-debuginfo-32bit - update to 1.1.1d-2.131.1
openssl-1_1 - addressed in versions 1.1.1d-2.131.1, 1.1.1l-150400.7.96.2, 1.1.1l-150500.17.57.2, 1.1.1w-150600.5.32.1, 1.1.1w-150700.11.22.1
openssl-1_1-debugsource - addressed in versions 1.1.1d-2.131.1, 1.1.1l-150400.7.96.2, 1.1.1l-150500.17.57.2, 1.1.1w-150600.5.32.1, 1.1.1w-150700.11.22.1
libopenssl1_1-hmac-32bit - addressed in versions 1.1.1d-2.131.1, 1.1.1l-150400.7.96.2, 1.1.1l-150500.17.57.2
libopenssl-1_1-devel-32bit - addressed in versions 1.1.1d-2.131.1, 1.1.1l-150400.7.96.2, 1.1.1l-150500.17.57.2, 1.1.1w-150600.5.32.1
libopenssl-1_1-devel - addressed in versions 1.1.1d-2.131.1, 1.1.1l-150400.7.96.2, 1.1.1l-150500.17.57.2, 1.1.1w-150600.5.32.1, 1.1.1w-150700.11.22.1
libopenssl1_1 - addressed in versions 1.1.1d-2.131.1, 1.1.1l-150400.7.96.2, 1.1.1l-150500.17.57.2, 1.1.1w-150600.5.32.1, 1.1.1w-150700.11.22.1
libopenssl1_1-debuginfo - addressed in versions 1.1.1d-2.131.1, 1.1.1l-150400.7.96.2, 1.1.1l-150500.17.57.2, 1.1.1w-150600.5.32.1, 1.1.1w-150700.11.22.1
openssl-help - addressed in versions 1.1.1f-43, 1.1.1wa-17, 3.0.12-52
openssl-libs - addressed in versions 1.1.1f-43, 1.1.1wa-17, 3.0.12-52
openssl-devel - addressed in versions 1.1.1f-43, 1.1.1wa-17, 3.0.12-52
openssl-debugsource - addressed in versions 1.1.1f-43, 1.1.1wa-17, 3.0.12-52
openssl-debuginfo - addressed in versions 1.1.1f-43, 1.1.1wa-17, 3.0.12-52
openssl - addressed in versions 1.1.1f-43, 1.1.1wa-17, 3.0.12-52
openssl-1_1-doc - addressed in versions 1.1.1l-150400.7.96.2, 1.1.1l-150500.17.57.2, 1.1.1w-150600.5.32.1
libopenssl-1_1-devel-64bit - addressed in versions 1.1.1l-150400.7.96.2, 1.1.1l-150500.17.57.2, 1.1.1w-150600.5.32.1
libopenssl1_1-hmac-64bit - addressed in versions 1.1.1l-150400.7.96.2, 1.1.1l-150500.17.57.2
libopenssl1_1-64bit-debuginfo - addressed in versions 1.1.1l-150400.7.96.2, 1.1.1l-150500.17.57.2, 1.1.1w-150600.5.32.1
libopenssl1_1-64bit - addressed in versions 1.1.1l-150400.7.96.2, 1.1.1l-150500.17.57.2, 1.1.1w-150600.5.32.1
libopenssl1_1-32bit-debuginfo - addressed in versions 1.1.1l-150400.7.96.2, 1.1.1l-150500.17.57.2, 1.1.1w-150600.5.32.1, 1.1.1w-150700.11.22.1
compat-openssl11 - update to 1.1.1m-19
compat-openssl11-debuginfo - update to 1.1.1m-19
compat-openssl11-debugsource - update to 1.1.1m-19
compat-openssl11-devel - update to 1.1.1m-19
compat-openssl11-libs - update to 1.1.1m-19
openssl-perl - addressed in versions 1.1.1wa-17, 3.0.12-52
openssl-3-debugsource - addressed in versions 3.0.8-150400.4.87.1, 3.0.8-150500.5.66.1, 3.1.4-150600.5.53.1, 3.2.3-150700.5.36.1
openssl-3-debuginfo - addressed in versions 3.0.8-150400.4.87.1, 3.0.8-150500.5.66.1, 3.1.4-150600.5.53.1, 3.2.3-150700.5.36.1
libopenssl3 - addressed in versions 3.0.8-150400.4.87.1, 3.0.8-150500.5.66.1, 3.1.4-150600.5.53.1, 3.2.3-150700.5.36.1
openssl-3 - addressed in versions 3.0.8-150400.4.87.1, 3.0.8-150500.5.66.1, 3.1.4-150600.5.53.1, 3.2.3-150700.5.36.1
libopenssl-3-devel - addressed in versions 3.0.8-150400.4.87.1, 3.0.8-150500.5.66.1, 3.1.4-150600.5.53.1, 3.2.3-150700.5.36.1
libopenssl3-debuginfo - addressed in versions 3.0.8-150400.4.87.1, 3.0.8-150500.5.66.1, 3.1.4-150600.5.53.1, 3.2.3-150700.5.36.1
libopenssl3-32bit - addressed in versions 3.0.8-150400.4.87.1, 3.0.8-150500.5.66.1, 3.1.4-150600.5.53.1, 3.2.3-150700.5.36.1
libopenssl-3-devel-32bit - addressed in versions 3.0.8-150400.4.87.1, 3.0.8-150500.5.66.1, 3.1.4-150600.5.53.1
libopenssl3-32bit-debuginfo - addressed in versions 3.0.8-150400.4.87.1, 3.0.8-150500.5.66.1, 3.1.4-150600.5.53.1, 3.2.3-150700.5.36.1
libopenssl3-64bit-debuginfo - addressed in versions 3.0.8-150400.4.87.1, 3.0.8-150500.5.66.1, 3.1.4-150600.5.53.1
libopenssl3-64bit - addressed in versions 3.0.8-150400.4.87.1, 3.0.8-150500.5.66.1, 3.1.4-150600.5.53.1
libopenssl-3-devel-64bit - addressed in versions 3.0.8-150400.4.87.1, 3.0.8-150500.5.66.1, 3.1.4-150600.5.53.1
openssl-3-doc - addressed in versions 3.0.8-150400.4.87.1, 3.0.8-150500.5.66.1, 3.1.4-150600.5.53.1
openssl - update to 3.0.12-26
openssl-devel - update to 3.0.12-26
openssl-doc - update to 3.0.12-26
openssl-perl - update to 3.0.12-26
openssl-libs - update to 3.0.12-26
openssl (Debian package) - addressed in versions 3.0.20-1~deb12u2, 3.5.6-1~deb13u2
libopenssl-3-fips-provider - addressed in versions 3.1.4-150600.5.53.1, 3.2.3-150700.5.36.1
libopenssl-3-fips-provider-debuginfo - addressed in versions 3.1.4-150600.5.53.1, 3.2.3-150700.5.36.1
libopenssl-3-fips-provider-32bit-debuginfo - addressed in versions 3.1.4-150600.5.53.1, 3.2.3-150700.5.36.1
libopenssl-3-fips-provider-32bit - addressed in versions 3.1.4-150600.5.53.1, 3.2.3-150700.5.36.1
libopenssl-3-fips-provider-64bit - update to 3.1.4-150600.5.53.1
libopenssl-3-fips-provider-64bit-debuginfo - update to 3.1.4-150600.5.53.1
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
EntireX - update to 11.1 Fix6
edk2-ovmf - addressed in versions 202002-38, 202011-36, 202308-41, 202308-45
python3-edk2-devel - addressed in versions 202002-38, 202011-36, 202308-41, 202308-45
edk2-help - addressed in versions 202002-38, 202011-36, 202308-41, 202308-45
edk2-aarch64 - addressed in versions 202002-38, 202011-36, 202308-41, 202308-45
edk2-devel - addressed in versions 202002-38, 202011-36, 202308-41, 202308-45
edk2-debugsource - addressed in versions 202002-38, 202011-36, 202308-41, 202308-45
edk2-debuginfo - addressed in versions 202002-38, 202011-36, 202308-41, 202308-45
edk2 - addressed in versions 202002-38, 202011-36, 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
• SUSE update for openssl-1_1
• SUSE update for openssl-3
• SUSE update for openssl-1_0_0
• SUSE update for openssl-3
• SUSE update for openssl-1_0_0
• SUSE update for openssl-1_1
• SUSE update for openssl-1_1
• SUSE update for openssl-1_1
• SUSE update for openssl-3
• openEuler 22.03 LTS SP4 update for openssl
• openEuler 20.03 LTS SP4 update for openssl
• openEuler 24.03 LTS SP3 update for openssl
• openEuler 24.03 LTS SP1 update for openssl
• openEuler 24.03 LTS SP3 update for compat-openssl11
• openEuler 24.03 LTS SP1 update for compat-openssl11
• SUSE update for openssl-1_1
• Anolis OS update for openssl
• SUSE update for openssl-3
• Multiple vulnerabilities in IBM Operator for PostgreSQL
• Multiple vulnerabilities in IBM EntireX
• Multiple vulnerabilities in IBM MQ Operator and Queue manager container images
• Multiple vulnerabilities in IBM i
• openEuler 24.03 LTS SP1 update for edk2
• openEuler 22.03 LTS SP4 update for edk2
• openEuler 20.03 LTS SP4 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