Use-after-free in OpenSSL - CVE-2026-45447

Vulnerability identifier: #VU134270

CSH Severity: High

CVSS v4: 8.4 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-45447

CWE-ID: CWE-416

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to execute arbitrary code.

The vulnerability exists due to use-after-free in the PKCS7_verify() function when processing a specially crafted PKCS#7 or S/MIME signed message during PKCS#7 signature verification. A remote attacker can send a specially crafted signed message to execute arbitrary code.

Applications using the CMS APIs for this processing are not affected.

OpenSSL
Debian Linux
SUSE Linux Enterprise Server 15 SP4
SUSE Linux Enterprise Server 15 SP6
SUSE Linux Enterprise Server 12 SP5 LTSS Extended
SUSE Linux Enterprise Server 12 SP5
SUSE Linux Enterprise Server 15 SP5
SUSE Linux Enterprise Server for SAP Applications 15
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 Real Time 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 Micro
SUSE Linux Enterprise Micro for Rancher
IBM i
Red Hat Enterprise Linux for Power, little endian
Fedora
Anolis OS
Red Hat Enterprise Linux for x86_64
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux for ARM 64
Red Hat Enterprise Linux Server - TUS
Red Hat Enterprise Linux Server - AUS
Red Hat Enterprise Linux for IBM z Systems - Extended Update Support
Red Hat Enterprise Linux for x86_64 - Extended Update Support
Red Hat Enterprise Linux for Power, little endian - Extended Update Support
Red Hat Enterprise Linux for ARM 64 - Extended Update Support
FreeBSD
Ubuntu
SUSE Linux Enterprise Live Patching
Development Tools Module
Legacy Module
Basesystem Module
openSUSE Leap
openEuler
IBM Cloud Pak for Data System
IBM MQ Operator
LANTIME Operating System Firmware (LTOS)
Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions
openssl-3-livepatches-debugsource
openssl-3-livepatches
openssl-3-livepatches-debuginfo
openssl-1_1-livepatches
openssl-1_1-livepatches-debugsource
openssl-1_1-livepatches-debuginfo
openssl (Ubuntu package)
openssl (Red Hat package)
compat-openssl10
compat-openssl10 (Red Hat package)
libopenssl1_0_0-debuginfo
openssl-1_0_0-debuginfo
openssl-1_0_0
openssl-1_0_0-debugsource
libopenssl-1_0_0-devel
libopenssl1_0_0-hmac
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
libopenssl10-debuginfo
libopenssl10
libopenssl-1_1-devel
libopenssl-1_1-devel-32bit
libopenssl1_1-hmac
openssl-1_1-debugsource
openssl-1_1
openssl-1_1-debuginfo
libopenssl1_1-32bit
libopenssl1_1-debuginfo-32bit
libopenssl1_1-hmac-32bit
libopenssl1_1
libopenssl1_1-debuginfo
openssl
openssl-help
openssl-libs
openssl-debuginfo
openssl-debugsource
openssl-devel
compat-openssl11 (Red Hat package)
openssl-perl
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
libopenssl-3-devel-64bit
openssl-3-debugsource
openssl-3-debuginfo
libopenssl3
openssl-3
libopenssl-3-devel
libopenssl3-debuginfo
openssl-3-doc
libopenssl3-64bit
libopenssl3-64bit-debuginfo
libopenssl-3-devel-32bit
libopenssl3-32bit
libopenssl3-32bit-debuginfo
openssl (Debian package)
libopenssl-3-fips-provider-64bit-debuginfo
libopenssl-3-fips-provider-64bit
libopenssl-3-fips-provider-32bit
libopenssl-3-fips-provider-debuginfo
libopenssl-3-fips-provider-32bit-debuginfo
libopenssl-3-fips-provider
openssl3
shim-aa64
shim-x64
shim-signed
shim-debugsource
shim-debuginfo
shim
shim-unsigned-x64
shim-unsigned-ia32
IBM supplied MQ Advanced container images
Operator for PostgreSQL
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-3-livepatches-debugsource - addressed in versions 0.4-150600.13.11.1, 0.4-150700.16.6.1
openssl-3-livepatches - addressed in versions 0.4-150600.13.11.1, 0.4-150700.16.6.1
openssl-3-livepatches-debuginfo - addressed in versions 0.4-150600.13.11.1, 0.4-150700.16.6.1
openssl-1_1-livepatches - addressed in versions 0.6-150400.3.20.1, 0.6-150500.6.14.1, 0.6-150600.11.6.1, 0.6-150700.13.6.1
openssl-1_1-livepatches-debugsource - addressed in versions 0.6-150400.3.20.1, 0.6-150500.6.14.1, 0.6-150600.11.6.1, 0.6-150700.13.6.1
openssl-1_1-livepatches-debuginfo - addressed in versions 0.6-150400.3.20.1, 0.6-150500.6.14.1, 0.6-150600.11.6.1, 0.6-150700.13.6.1
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 (Red Hat package) - addressed in versions 1.0.2k-26.el7_9.2, 3.5.5-4.el9_8, 3.5.5-4.el10_2
compat-openssl10 - update to 1.0.2o-4.0.2
compat-openssl10 (Red Hat package) - addressed in versions 1.0.2o-4.el8_8.1, 1.0.2o-4.el8_10.3
libopenssl1_0_0-debuginfo - 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
openssl-1_0_0 - addressed in versions 1.0.2p-3.109.1, 1.0.2p-150000.3.108.1
openssl-1_0_0-debugsource - addressed in versions 1.0.2p-3.109.1, 1.0.2p-150000.3.108.1
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
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
libopenssl10-debuginfo - update to 1.0.2p-150000.3.108.1
libopenssl10 - update to 1.0.2p-150000.3.108.1
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
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
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-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
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-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
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
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 - addressed in versions 1.1.1f-43, 1.1.1wa-17, 3.0.12-52
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-debuginfo - 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-devel - addressed in versions 1.1.1f-43, 1.1.1wa-17, 3.0.12-52
compat-openssl11 (Red Hat package) - addressed in versions 1.1.1k-4.el9_2.2, 1.1.1k-5.el9_6.3
openssl-perl - update to 1.1.1k-16.0.1
openssl-libs - update to 1.1.1k-16.0.1
openssl-devel - update to 1.1.1k-16.0.1
openssl - update to 1.1.1k-16.0.1
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
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-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
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
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
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
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 - 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-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
openssl (Debian package) - addressed in versions 3.0.20-1~deb12u2, 3.5.6-1~deb13u2
libopenssl-3-fips-provider-64bit-debuginfo - update to 3.1.4-150600.5.53.1
libopenssl-3-fips-provider-64bit - update to 3.1.4-150600.5.53.1
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-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 - addressed in versions 3.1.4-150600.5.53.1, 3.2.3-150700.5.36.1
openssl3 - update to 3.5.5-5.el8
openssl - update to 3.5.7-1.fc44
EntireX - update to 11.1 Fix6
shim-aa64 - update to 15.7-4
shim-x64 - update to 15.7-4
shim-signed - update to 15.7-27
shim-debugsource - update to 15.7-27
shim-debuginfo - update to 15.7-27
shim - update to 15.7-27
shim-unsigned-x64 - update to 15.8-4
shim-unsigned-ia32 - update to 15.8-4

• 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-1_1-livepatches
• SUSE update for openssl-1_1-livepatches
• SUSE update for openssl-3-livepatches
• SUSE update for openssl-1_1-livepatches
• 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 update for shim
• openEuler 24.03 LTS SP3 update for compat-openssl11
• openEuler 24.03 LTS SP1 update for compat-openssl11
• SUSE update for openssl-1_1
• SUSE update for openssl-1_1-livepatches
• Anolis OS update for openssl
• Anolis OS update for shim
• SUSE update for openssl-3
• SUSE update for openssl-3-livepatches
• Multiple vulnerabilities in IBM Operator for PostgreSQL
• Anolis OS update for shim-unsigned-x64
• Multiple vulnerabilities in IBM EntireX
• Red Hat Enterprise Linux 9 update for compat-openssl11
• Red Hat Enterprise Linux 8 update for compat-openssl10
• Red Hat Enterprise Linux 8 update for compat-openssl10
• Multiple vulnerabilities in IBM MQ Operator and Queue manager container images
• Anolis OS update for compat-openssl10
• Red Hat Enterprise Linux 9 update for compat-openssl11
• Multiple vulnerabilities in IBM i
• Fedora EPEL 8 update for openssl3
• Multiple vulnerabilities in Meinberg LANTIME firmware
• Red Hat Enterprise Linux 7 Extended Lifecycle Support update for openssl
• Multiple vulnerabilities in IBM Cloud Pak for Data System