Out-of-bounds read in OpenSSL - CVE-2026-34180

Vulnerability identifier: #VU134278

CSH Severity: Medium

CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-34180

CWE-ID: CWE-125

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to disclose sensitive information.

The vulnerability exists due to integer truncation in the ASN.1 decoder when parsing a crafted DER-encoded ASN.1 structure with a primitive element whose content exceeds 2 gigabytes in length. A remote attacker can supply crafted ASN.1 input to disclose sensitive information.

The issue affects only 64-bit Unix and Unix-like platforms; 32-bit platforms and 64-bit Windows are not affected.

OpenSSL
Debian Linux
SUSE Linux Enterprise Server 12 SP5 LTSS Extended
SUSE Linux Enterprise Server 12 SP5
SUSE Linux Enterprise Server 15 SP6
SUSE Linux Enterprise Server 15 SP5
SUSE Linux Enterprise Server 15 SP4
SUSE Linux Enterprise High Performance Computing LTSS 15
SUSE Linux Enterprise Server 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 Server for SAP Applications 12
SUSE Linux Enterprise Server 12
SUSE Linux Enterprise High Performance Computing 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 x86_64
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux for ARM 64
FreeBSD
Ubuntu
Legacy Module
Development Tools Module
Basesystem Module
openSUSE Leap
openEuler
Anolis OS
python-cryptography
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)
openssl (Ubuntu package)
openssl-1_0_0-debuginfo
libopenssl1_0_0-hmac
libopenssl-1_0_0-devel
openssl-1_0_0-debugsource
openssl-1_0_0
libopenssl1_0_0-debuginfo
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
libopenssl10-debuginfo
openssl-1_1-debugsource
libopenssl1_1-debuginfo
libopenssl1_1
libopenssl-1_1-devel
libopenssl-1_1-devel-32bit
libopenssl1_1-hmac-32bit
libopenssl1_1-debuginfo-32bit
libopenssl1_1-32bit
openssl-1_1-debuginfo
openssl-1_1
libopenssl1_1-hmac
openssl
openssl-debuginfo
openssl-debugsource
openssl-devel
openssl-libs
openssl-help
libopenssl-1_1-devel-64bit
openssl-1_1-doc
libopenssl1_1-32bit-debuginfo
libopenssl1_1-64bit
libopenssl1_1-64bit-debuginfo
libopenssl1_1-hmac-64bit
compat-openssl11-libs
compat-openssl11-devel
compat-openssl11-debugsource
compat-openssl11-debuginfo
compat-openssl11
openssl-perl
openssl-3-doc
libopenssl-3-devel-64bit
libopenssl3
libopenssl3-64bit
libopenssl3-64bit-debuginfo
libopenssl3-32bit-debuginfo
libopenssl-3-devel-32bit
libopenssl3-32bit
libopenssl3-debuginfo
libopenssl-3-devel
openssl-3
openssl-3-debuginfo
openssl-3-debugsource
openssl-doc
openssl (Debian package)
libopenssl-3-fips-provider-64bit-debuginfo
libopenssl-3-fips-provider-64bit
libopenssl-3-fips-provider-32bit
libopenssl-3-fips-provider-32bit-debuginfo
libopenssl-3-fips-provider-debuginfo
libopenssl-3-fips-provider
openssl (Red Hat package)
openssl3
shim-debugsource
shim-signed
shim-debuginfo
shim
edk2-debuginfo
python3-edk2-devel
edk2-ovmf
edk2-help
edk2-aarch64
edk2-devel
edk2-debugsource
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
python-cryptography - update to 48.0.1
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
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-debuginfo - 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
libopenssl-1_0_0-devel - 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
openssl-1_0_0 - 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
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 - update to 1.0.2p-150000.3.108.1
libopenssl10-debuginfo - update to 1.0.2p-150000.3.108.1
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-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 - 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 - 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-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-debuginfo-32bit - update to 1.1.1d-2.131.1
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
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
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
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 - 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
openssl-libs - 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
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
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
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
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_1-64bit-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-hmac-64bit - addressed in versions 1.1.1l-150400.7.96.2, 1.1.1l-150500.17.57.2
compat-openssl11-libs - update to 1.1.1m-19
compat-openssl11-devel - update to 1.1.1m-19
compat-openssl11-debugsource - update to 1.1.1m-19
compat-openssl11-debuginfo - update to 1.1.1m-19
compat-openssl11 - update to 1.1.1m-19
openssl-perl - addressed in versions 1.1.1wa-17, 3.0.12-52
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
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
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
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
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
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-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
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
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
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
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-doc - update to 3.0.12-26
openssl-perl - update to 3.0.12-26
openssl-libs - update to 3.0.12-26
openssl-devel - update to 3.0.12-26
openssl - 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-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-32bit-debuginfo - 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 - addressed in versions 3.1.4-150600.5.53.1, 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
EntireX - update to 11.1 Fix6
shim-debugsource - update to 15.7-27
shim-signed - update to 15.7-27
shim-debuginfo - update to 15.7-27
shim - update to 15.7-27
edk2-debuginfo - addressed in versions 202308-37, 202308-41
python3-edk2-devel - addressed in versions 202308-37, 202308-41
edk2-ovmf - addressed in versions 202308-37, 202308-41
edk2-help - addressed in versions 202308-37, 202308-41
edk2-aarch64 - addressed in versions 202308-37, 202308-41
edk2-devel - addressed in versions 202308-37, 202308-41
edk2-debugsource - addressed in versions 202308-37, 202308-41
edk2 - addressed in versions 202308-37, 202308-41

• 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 edk2
• openEuler 24.03 LTS SP1 update for edk2
• 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
• 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
• Fedora EPEL 8 update for openssl3
• python-cryptography update for OpenSSL
• 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