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OpenAdvisories

Description

Issue summary: Parsing a crafted DER-encoded ASN.1 structure with a primitive
element whose content exceeds 2 gigabytes in length may cause a heap buffer
over-read on 64-bit Unix and Unix-like platforms.

Impact summary: The heap buffer over-read may crash the application (Denial of
Service) or to load into the decoded ASN.1 object contents of memory beyond the
end of the input buffer. More typically such ASN.1 elements would instead be
truncated.

An integer truncation in OpenSSL's ASN.1 decoder causes the content length of
an ASN.1 primitive element to be mishandled when it exceeds 2 gigabytes. In the
worst case the truncated length is treated as a request to scan the binary
content for a terminating zero byte, possibly causing OpenSSL to read either
less than or beyond the end of the allocated buffer.

Applications that pass attacker-supplied data to d2i_X509(), d2i_PKCS7(), or
any other d2i_* decoding function are affected. OpenSSL's own command-line
tools are not vulnerable, as data read through the BIO layer is checked before
it reaches the affected code. The issue only affects 64-bit Unix and Unix-like
platforms; 32-bit platforms and 64-bit Windows are not affected.

The FIPS modules in 4.0, 3.6, 3.5, 3.4 and 3.0 are not affected by this issue,
as the affected code is outside the OpenSSL FIPS module boundary.

Affected products

VendorProductAffectedFixed
OpenSSL OpenSSL 4.0.0 – < 4.0.1, 3.6.0 – < 3.6.3, 3.5.0 – < 3.5.7, 3.4.0 – < 3.4.6, 3.0.0 – < 3.0.21, 1.1.1 – < 1.1.1zh, 1.0.2 – < 1.0.2zq 4.0.1

Fixed in Linux distributions

Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.

ReleasePackageFixed inAdvisory
Debian 14 openssl 3.6.3-1 —
Debian 13 openssl 3.5.6-1~deb13u2 —
Debian 12 openssl 3.0.20-1~deb12u2 —
ReleasePackageFixed inAdvisory
Ubuntu 26.10 edk2 +1 No fix yet —
Ubuntu 26.04 LTS edk2 +1 No fix yet —
Ubuntu 26.04 LTS openssl 3.5.5-1ubuntu3.2 —
Ubuntu 25.10 edk2 No fix yet —
Ubuntu 25.10 openssl 3.5.3-1ubuntu3.4 —
Ubuntu 24.04 LTS edk2 No fix yet —
Ubuntu 24.04 LTS openssl 3.0.13-0ubuntu3.11 —
Ubuntu 22.04 LTS edk2 No fix yet —
Ubuntu 22.04 LTS openssl 3.0.2-0ubuntu1.25 —
Show 14 more (older releases, extended support, other products)
ReleasePackageFixed inAdvisory
Ubuntu Pro FIPS 20.04 LTS openssl No fix yet —
Ubuntu Pro FIPS 18.04 LTS openssl No fix yet —
Ubuntu Pro FIPS 16.04 LTS openssl No fix yet —
Ubuntu Pro FIPS-updates 24.04 LTS openssl-fips 3.0.13-0ubuntu3.12+Fips1 —
Ubuntu Pro FIPS-updates 22.04 LTS openssl 3.0.2-0ubuntu1.25+Fips1 —
Ubuntu Pro FIPS-updates 22.04 LTS openssl-fips No fix yet —
Ubuntu Pro FIPS-updates 20.04 LTS openssl 1.1.1f-1ubuntu2.fips.24.4 —
Ubuntu Pro FIPS-updates 18.04 LTS openssl 1.1.1-1ubuntu2.fips.2.1~18.04.23.9 —
Ubuntu Pro FIPS-updates 16.04 LTS openssl No fix yet —
Ubuntu Pro FIPS-preview 22.04 LTS openssl +1 No fix yet —
Ubuntu Pro 22.04 LTS nodejs No fix yet —
Ubuntu Pro 20.04 LTS edk2 No fix yet —
Ubuntu Pro 20.04 LTS openssl 1.1.1f-1ubuntu2.24+esm4 —
Ubuntu Pro 18.04 LTS edk2 +1 No fix yet —
Ubuntu Pro 18.04 LTS openssl 1.1.1-1ubuntu2.1~18.04.23+esm9 —
Ubuntu Pro 18.04 LTS openssl1.0 1.0.2n-1ubuntu5.13+esm5 —
Ubuntu Pro 16.04 LTS edk2 +1 No fix yet —
Ubuntu Pro 16.04 LTS openssl 1.0.2g-1ubuntu4.20+esm16 —
Ubuntu Pro 14.04 LTS openssl 1.0.1f-1ubuntu2.27+esm14 —
ReleasePackageFixed inAdvisory
RHEL 10 openssl +3 1:3.5.5-4.el10_2 RHSA-2026:25237
RHEL 9 openssl +3 1:3.5.5-4.el9_8 RHSA-2026:25239
Show 1 more (older releases, extended support, other products)
ReleasePackageFixed inAdvisory
Red Hat Hardened Images 1 bootupd +1 0.3.2-1.hum1 RHSA-2026:67551
Red Hat Hardened Images 1 chunkah 0.6.0-3.hum1 RHSA-2026:42825
Red Hat Hardened Images 1 openssl +10 1:3.5.8-0.1.hum1 RHSA-2026:59641, RHSA-2026:59635
Red Hat Hardened Images 1 python-cryptography +1 50.0.0-1.hum1 RHSA-2026:55543
Red Hat Hardened Images 1 ruby3.3 +5 3.3.10-23.6.hum1 RHSA-2026:62562
Red Hat Hardened Images 1 ruby3.4 +5 3.4.10-31.7.hum1 RHSA-2026:62790
Red Hat Hardened Images 1 ruby4.0 +5 4.0.6-37.3.hum1 RHSA-2026:62563
Red Hat Hardened Images 1 rubygem3.3-bigdecimal 3.1.5-23.6.hum1 RHSA-2026:62562
Red Hat Hardened Images 1 rubygem3.3-bundler 2.5.22-23.6.hum1 RHSA-2026:62562
Red Hat Hardened Images 1 rubygem3.3-devel +1 3.5.22-23.6.hum1 RHSA-2026:62562
Red Hat Hardened Images 1 rubygem3.3-io-console 0.7.1-23.6.hum1 RHSA-2026:62562
Red Hat Hardened Images 1 rubygem3.3-irb 1.13.1-23.6.hum1 RHSA-2026:62562
Red Hat Hardened Images 1 rubygem3.3-json 2.7.2-23.6.hum1 RHSA-2026:62562
Red Hat Hardened Images 1 rubygem3.3-minitest 5.20.0-23.6.hum1 RHSA-2026:62562
Red Hat Hardened Images 1 rubygem3.3-power_assert 2.0.3-23.6.hum1 RHSA-2026:62562
Red Hat Hardened Images 1 rubygem3.3-psych 5.1.2-23.6.hum1 RHSA-2026:62562
Red Hat Hardened Images 1 rubygem3.3-racc 1.7.3-23.6.hum1 RHSA-2026:62562
Red Hat Hardened Images 1 rubygem3.3-rake 13.1.0-23.6.hum1 RHSA-2026:62562
Red Hat Hardened Images 1 rubygem3.3-rbs 3.4.0-23.6.hum1 RHSA-2026:62562
Red Hat Hardened Images 1 rubygem3.3-rdoc 6.6.3.1-23.6.hum1 RHSA-2026:62562
Red Hat Hardened Images 1 rubygem3.3-rexml 3.4.4-23.6.hum1 RHSA-2026:62562
Red Hat Hardened Images 1 rubygem3.3-rss 0.3.1-23.6.hum1 RHSA-2026:62562
Red Hat Hardened Images 1 rubygem3.3-test-unit 3.6.1-23.6.hum1 RHSA-2026:62562
Red Hat Hardened Images 1 rubygem3.3-typeprof 0.21.9-23.6.hum1 RHSA-2026:62562
Red Hat Hardened Images 1 rubygem4.0-bigdecimal 4.0.1-37.3.hum1 RHSA-2026:62563
Red Hat Hardened Images 1 rubygem4.0-devel +2 4.0.16-37.3.hum1 RHSA-2026:62563
Red Hat Hardened Images 1 rubygem4.0-io-console 0.8.2-37.3.hum1 RHSA-2026:62563
Red Hat Hardened Images 1 rubygem4.0-irb 1.16.0-37.3.hum1 RHSA-2026:62563
Red Hat Hardened Images 1 rubygem4.0-json 2.18.0-37.3.hum1 RHSA-2026:62563
Red Hat Hardened Images 1 rubygem4.0-minitest 6.0.0-37.3.hum1 RHSA-2026:62563
Red Hat Hardened Images 1 rubygem4.0-power_assert 3.0.1-37.3.hum1 RHSA-2026:62563
Red Hat Hardened Images 1 rubygem4.0-psych 5.3.1-37.3.hum1 RHSA-2026:62563
Red Hat Hardened Images 1 rubygem4.0-racc 1.8.1-37.3.hum1 RHSA-2026:62563
Red Hat Hardened Images 1 rubygem4.0-rake 13.3.1-37.3.hum1 RHSA-2026:62563
Red Hat Hardened Images 1 rubygem4.0-rbs 3.10.0-37.3.hum1 RHSA-2026:62563
Red Hat Hardened Images 1 rubygem4.0-rdoc 7.0.4-37.3.hum1 RHSA-2026:62563
Red Hat Hardened Images 1 rubygem4.0-rexml 3.4.4-37.3.hum1 RHSA-2026:62563
Red Hat Hardened Images 1 rubygem4.0-rss 0.3.2-37.3.hum1 RHSA-2026:62563
Red Hat Hardened Images 1 rubygem4.0-test-unit 3.7.5-37.3.hum1 RHSA-2026:62563
Red Hat Hardened Images 1 rubygem4.0-typeprof 0.31.1-37.3.hum1 RHSA-2026:62563

AlmaLinux

Errata ↗
ReleasePackageFixed inAdvisory
AlmaLinux 10 openssl +3 1:3.5.5-4.el10_2.alma.1 ALSA-2026:25237
AlmaLinux 9 openssl +3 1:3.5.5-4.el9_8 ALSA-2026:25239

Rocky Linux

Errata ↗
ReleasePackageFixed inAdvisory
Rocky Linux 10 openssl 1:3.5.5-4.el10_2 RLSA-2026:25237
Rocky Linux 9 openssl 1:3.5.5-4.el9_8 RLSA-2026:25239
ReleasePackageFixed inAdvisory
SLES 15 SP7 openssl-1_0_0 1.0.2p-150000.3.108.1 SUSE-SU-2026:2399-1
SLES 15 SP7 openssl-1_1 1.1.1w-150700.11.22.1 SUSE-SU-2026:2392-1
SLES 15 SP7 openssl-3 3.2.3-150700.5.36.1 SUSE-SU-2026:2648-1
SLES 15 SP6 openssl-1_0_0 1.0.2p-150000.3.108.1 SUSE-SU-2026:2399-1
SLES 15 SP6 openssl-1_1 1.1.1w-150600.5.32.1 SUSE-SU-2026:2404-1
SLES 15 SP6 openssl-3 3.1.4-150600.5.53.1 SUSE-SU-2026:2393-1
SLES 15 SP5 openssl-1_0_0 1.0.2p-150000.3.108.1 SUSE-SU-2026:2399-1
SLES 15 SP5 openssl-1_1 1.1.1l-150500.17.57.2 SUSE-SU-2026:2405-1
SLES 15 SP5 openssl-3 3.0.8-150500.5.66.1 SUSE-SU-2026:2397-1
SLES 15 SP4 openssl-1_0_0 1.0.2p-150000.3.108.1 SUSE-SU-2026:2399-1
SLES 15 SP4 openssl-1_1 1.1.1l-150400.7.96.2 SUSE-SU-2026:2614-1
SLES 15 SP4 openssl-3 3.0.8-150400.4.87.1 SUSE-SU-2026:2598-1
SLES 12 SP5 openssl-1_0_0 1.0.2p-3.109.1 SUSE-SU-2026:2396-1
SLES 12 SP5 openssl-1_1 1.1.1d-2.131.1 SUSE-SU-2026:2403-1
Show 13 more (older releases, extended support, other products)
ReleasePackageFixed inAdvisory
SLES for SAP 16.0 openssl-3 3.5.0-160000.8.1 SUSE-SU-2026:22315-1
SLES for SAP 15 SP6 openssl-1_0_0 1.0.2p-150000.3.108.1 SUSE-SU-2026:2399-1
SLES for SAP 15 SP6 openssl-1_1 1.1.1w-150600.5.32.1 SUSE-SU-2026:2404-1
SLES for SAP 15 SP6 openssl-3 3.1.4-150600.5.53.1 SUSE-SU-2026:2393-1
SLES for SAP 15 SP5 openssl-1_0_0 1.0.2p-150000.3.108.1 SUSE-SU-2026:2399-1
SLES for SAP 15 SP5 openssl-1_1 1.1.1l-150500.17.57.2 SUSE-SU-2026:2405-1
SLES for SAP 15 SP5 openssl-3 3.0.8-150500.5.66.1 SUSE-SU-2026:2397-1
SLES for SAP 15 SP4 openssl-1_0_0 1.0.2p-150000.3.108.1 SUSE-SU-2026:2399-1
SLES for SAP 15 SP4 openssl-1_1 1.1.1l-150400.7.96.2 SUSE-SU-2026:2614-1
SLES for SAP 15 SP4 openssl-3 3.0.8-150400.4.87.1 SUSE-SU-2026:2598-1
SLES 16.0 openssl-3 3.5.0-160000.8.1 SUSE-SU-2026:22315-1
SLE Micro 6.2 openssl-3 3.5.0-160000.8.1 SUSE-SU-2026:22251-1
SLE Micro 6.1 openssl-3 3.1.4-slfo.1.1_10.1 SUSE-SU-2026:22132-1
SLE Micro 6.0 openssl-3 3.1.4-14.1 SUSE-SU-2026:22100-1
SLE Micro 5.5 openssl-1_1 1.1.1l-150500.17.57.2 SUSE-SU-2026:2405-1
SLE Micro 5.4 openssl-1_1 1.1.1l-150400.7.96.2 SUSE-SU-2026:2614-1
SLE Micro 5.4 openssl-3 3.0.8-150400.4.87.1 SUSE-SU-2026:2598-1
SLE Micro 5.3 openssl-1_1 1.1.1l-150400.7.96.2 SUSE-SU-2026:2614-1
SLE Micro 5.3 openssl-3 3.0.8-150400.4.87.1 SUSE-SU-2026:2598-1
SLE HPC 15 SP5 openssl-1_1 1.1.1l-150500.17.57.2 SUSE-SU-2026:2405-1
SLE HPC 15 SP5 openssl-3 3.0.8-150500.5.66.1 SUSE-SU-2026:2397-1
SLE HPC 15 SP4 openssl-1_0_0 1.0.2p-150000.3.108.1 SUSE-SU-2026:2399-1
SLE HPC 15 SP4 openssl-1_1 1.1.1l-150400.7.96.2 SUSE-SU-2026:2614-1
SLE HPC 15 SP4 openssl-3 3.0.8-150400.4.87.1 SUSE-SU-2026:2598-1
ReleasePackageFixed inAdvisory
openSUSE Tumbleweed openssl-3 3.5.3-6.1 openSUSE-SU-2026:11023-1
openSUSE Leap 16.0 openssl-3 3.5.0-160000.8.1 openSUSE-SU-2026:21005-1
ReleasePackageFixed inAdvisory
Alpine v3.24 openssl 3.5.7-r0 —
Alpine v3.23 openssl 3.5.7-r0 —
Alpine v3.22 openssl 3.5.7-r0 —

Amazon Linux

ReleasePackageFixed inAdvisory
Amazon Linux 2023 openssl +5 1:3.5.5-1.amzn2023.0.5 ALAS2023-2026-1853
Amazon Linux 2 edk2-ovmf +3 20240813-312.amzn2 ALAS2-2026-3363
Amazon Linux 2 openssl +4 1:1.0.2k-24.amzn2.0.21 ALAS2-2026-3365
Amazon Linux 2 openssl11 +3 1:1.1.1zh-1.amzn2.0.1 ALAS2-2026-3364

Azure Linux

ReleasePackageFixed inAdvisory
Azure Linux 3 edk2 20240524git3e722403cd16-18 —
Azure Linux 3 openssl 3.3.7-3 —
Azure Linux 3 openssl-fips-provider No fix yet —

Oracle Linux

ReleasePackageFixed inAdvisory
Oracle Linux 10 openssl +3 1:3.5.5-5.0.1.el10_2 ELSA-2026-25237
Oracle Linux 9 openssl +3 1:3.5.5-4.0.1.el9_8 ELSA-2026-50379, ELSA-2026-25239

Wolfi

ReleasePackageFixed inAdvisory
Wolfi rolling openssl +1 3.6.3-r0 —
Wolfi rolling openssl-4.0 +2 4.0.1-r0 —

Advisories 43

References