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Fencer Vulns
medium 5.5

CVE-2026-22795 json

Missing ASN1_TYPE validation in PKCS#12 parsing

published 2026-01-27 9 mo ago modified 2026-10-15 25 d ago also EUVD-2026-4815 , GHSA-3vqq-45qg-2xf6 , JLSEC-2026-269

cvss
5.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 7%
public exploits
0
none known

Summary

Issue summary: An invalid or NULL pointer dereference can happen in an application processing a malformed PKCS#12 file.

Impact summary: An application processing a malformed PKCS#12 file can be caused to dereference an invalid or NULL pointer on memory read, resulting in a Denial of Service.

A type confusion vulnerability exists in PKCS#12 parsing code where an ASN1_TYPE union member is accessed without first validating the type, causing an invalid pointer read.

The location is constrained to a 1-byte address space, meaning any attempted pointer manipulation can only target addresses between 0x00 and 0xFF. This range corresponds to the zero page, which is unmapped on most modern operating systems and will reliably result in a crash, leading only to a Denial of Service. Exploiting this issue also requires a user or application to process a maliciously crafted PKCS#12 file. It is uncommon to accept untrusted PKCS#12 files in applications as they are usually used to store private keys which are trusted by definition. For these reasons, the issue was assessed as Low severity.

The FIPS modules in 3.5, 3.4, 3.3 and 3.0 are not affected by this issue, as the PKCS12 implementation is outside the OpenSSL FIPS module boundary.

OpenSSL 3.6, 3.5, 3.4, 3.3, 3.0 and 1.1.1 are vulnerable to this issue.

OpenSSL 1.0.2 is not affected by this issue.

Patch / fix

  • julia OpenSSL_jll 3.0.20+0, 3.5.5+0
  • julia Openresty_jll 1.29.203+0
  • OpenSSL OpenSSL 1.1.1ze, 3.0.19, 3.3.6, 3.4.4, 3.5.5, 3.6.1
  • openssl Debian 12 3.0.18-1~deb12u2
  • openssl Debian 13 3.5.4-1~deb13u2
  • openssl Debian 14 3.5.5-1

debian advisories DEBIAN-CVE-2026-22795

  • openssl Ubuntu 22.04 LTS 3.0.2-0ubuntu1.21
  • openssl Ubuntu 24.04 LTS 3.0.13-0ubuntu3.7
  • openssl Ubuntu 25.10 3.5.3-1ubuntu3
  • openssl Ubuntu 26.04 LTS 3.5.5-1ubuntu1
  • openssl Ubuntu Pro 18.04 LTS 1.1.1-1ubuntu2.1~18.04.23+esm7
  • openssl Ubuntu Pro FIPS-updates 18.04 LTS 1.1.1-1ubuntu2.fips.2.1~18.04.23.7
  • openssl Ubuntu Pro 20.04 LTS 1.1.1f-1ubuntu2.24+esm2
  • openssl Ubuntu Pro FIPS-updates 20.04 LTS 1.1.1f-1ubuntu2.fips.24.2

ubuntu advisories UBUNTU-CVE-2026-22795

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • openssl hummingbird 1 3.5.6-0.1.hum1
  • openssl-libs hummingbird 1 3.5.6-0.1.hum1
  • openssl-perl hummingbird 1 3.5.6-0.1.hum1
  • openssl-config-fips hummingbird 1 3.5.6-0.1.hum1
  • openssl-devel-engine hummingbird 1 3.5.6-0.1.hum1
  • openssl RHEL 9 1:3.5.1-7.el9_7
  • openssl-libs RHEL 9 1:3.5.1-7.el9_7
  • openssl-perl RHEL 9 1:3.5.1-7.el9_7

red hat advisories RHSA-2026:7261RHSA-2026:1473RHSA-2026:1472

  • openssl-3 Linux Micro 6.1 3.1.4-slfo.1.1_8.1
  • openssl-3 Linux Micro 6.0 3.1.4-11.1
  • openssl-3 SLES 16.0, Linux Micro 6.2, SLES for SAP applications 16.0 3.5.0-160000.5.1
  • openssl-1_1 SLES for SAP 15 SP4, SLES 15 SP4-LTSS, SLE Micro 5.4 +3 more 1.1.1l-150400.7.87.1
  • openssl-1_1 SLES for SAP 15 SP5, SLES 15 SP5-LTSS, SLE Micro 5.5 +2 more 1.1.1l-150500.17.46.1
  • openssl-1_1 SLES for SAP 15 SP6, SLES 15 SP6-LTSS, openSUSE Leap 15.6 1.1.1w-150600.5.21.1
  • openssl-1_1 SLE Micro 5.2 1.1.1d-150200.11.106.1
  • openssl-1_1 SLE Module for Legacy 15 SP7, SLE Module for Development Tools 15 SP7, SLE Module for Basesystem 15 SP7 1.1.1w-150700.11.11.1

suse advisories SUSE-SU-2026:20373-1SUSE-SU-2026:20349-1SUSE-SU-2026:20211-1SUSE-SU-2026:20223-1SUSE-SU-2026:0360-1SUSE-SU-2026:0359-1

  • openssl-3 openSUSE Tumbleweed 3.5.3-2.1
  • openssl-3 openSUSE Leap 16.0 3.5.0-160000.5.1

opensuse advisories openSUSE-SU-2026:10237-1openSUSE-SU-2026:20152-1

  • openssl AlmaLinux 10 1:3.5.1-7.el10_1.alma.1
  • openssl-libs AlmaLinux 10 1:3.5.1-7.el10_1.alma.1
  • openssl-perl AlmaLinux 10 1:3.5.1-7.el10_1.alma.1
  • openssl AlmaLinux 9 1:3.5.1-7.el9_7
  • openssl-libs AlmaLinux 9 1:3.5.1-7.el9_7
  • openssl-perl AlmaLinux 9 1:3.5.1-7.el9_7

almalinux advisories ALSA-2026:1472ALSA-2026:1473

  • openssl Rocky Linux 10 1:3.5.1-7.el10_1
  • openssl Rocky Linux 9 1:3.5.1-7.el9_7

rocky linux advisories RLSA-2026:1472RLSA-2026:1473

  • openssl Alpine 3.17 3.0.19-r0
  • openssl Alpine 3.21, Alpine 3.20 3.3.6-r0
  • openssl Alpine 3.24, Alpine 3.23, Alpine 3.22 3.5.5-r0

alpine advisories ALPINE-CVE-2026-22795

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • openssl Azure Linux 3.0 3.3.5-3
  • edk2 Azure Linux 3.0 20240524git3e722403cd16-14
  • edk2 CBL-Mariner 2.0 20230301gitf80f052277c8-47
  • hvloader CBL-Mariner 2.0 1.0.1-18

azure linux advisories AZL-75275AZL-75893AZL-76119AZL-76155

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-22795 updated cvss 5.5

openssl: OpenSSL: Denial of Service due to type confusion in PKCS#12 file processing

  • Red Hat Enterprise Linux 6 openssl, openssl-perl Red Hat Enterprise Linux 7 ovmf, OVMF, AAVMF, openssl, openssl-libs, openssl-perl Red Hat Enterprise Linux 8 edk2, shim, openssl, shim-x64, edk2-ovmf, shim-aa64, +9 more Red Hat Enterprise Linux 9 edk2, shim, shim-x64, edk2-ovmf, shim-aa64, edk2-tools, +4 more Red Hat Enterprise Linux 10 edk2, shim, shim-unsigned-x64, shim-unsigned-aarch64 Red Hat JBoss Core Services openssl
    +1 more products
    Red Hat OpenShift Container Platform 4 openshift/ose-rhel-coreos-8, openshift/ose-rhel-coreos-9
    affected: workaround, no fix available “Fix deferred”
  • Red Hat Cert Manager support for Red Hat OpenShift release 1.18 cert-manager/cert-manager-operator-rhel9 1789029076, cert-manager/jetstack-cert-manager-rhel9 1791459711, cert-manager/cert-manager-istio-csr-rhel9 1791459759, cert-manager/cert-manager-operator-bundle 1791966259, cert-manager/jetstack-cert-manager-acmesolver-rhel9 1791459707
    fixed: vendor fix RHSA-2026:82354
  • Red Hat Cost Management 4 costmanagement 1770836349
    fixed: vendor fix RHSA-2026:3228
  • Red Hat Discovery 2 discovery 1769104765, discovery 1769111774
    fixed: vendor fix RHSA-2026:1736
  • Red Hat Enterprise Linux AppStream (v. 9) openssl-perl 3.5.1-7.el9_7
    fixed: vendor fix RHSA-2026:1473
  • Red Hat Enterprise Linux AppStream (v. 10) openssl-perl 3.5.1-7.el10_1
    fixed: vendor fix RHSA-2026:1472
  • Red Hat Enterprise Linux BaseOS (v. 9) openssl 3.5.1-7.el9_7, openssl-libs 3.5.1-7.el9_7
    fixed: vendor fix RHSA-2026:1473
  • Red Hat Enterprise Linux BaseOS (v. 10) openssl 3.5.1-7.el10_1, openssl-libs 3.5.1-7.el10_1
    fixed: vendor fix RHSA-2026:1472
show 4 more
  • Red Hat Hardened Images openssl 3.5.6-0.1.hum1, openssl-libs 3.5.6-0.1.hum1, openssl-perl 3.5.6-0.1.hum1, openssl-config-fips 3.5.6-0.1.hum1, openssl-devel-engine 3.5.6-0.1.hum1
    fixed: vendor fix RHSA-2026:7261
  • Red Hat Insights proxy 1.5 insights-proxy 1770740405
    fixed: vendor fix RHSA-2026:2485
  • Red Hat Update Infrastructure 5 rhui5 1770646925, rhui5 1773670073, rhui5 1773670137, rhui5 1773672059
    fixed: vendor fix RHSA-2026:4943
  • Red Hat Cost Management 4 costmanagement 1770837277 Red Hat Update Infrastructure 5 rhui5 1770807477, rhui5 1770808689, rhui5 1770808765, rhui5 1773668803
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

cisa ICSA-24-102-01 updated cvss 5.5

Siemens SIMATIC S7-1500 TM MFP

  • Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem
    affected: mitigation, no fix available

Facts from CISA's republication of the vendor's own advisory (CSAF); the linked advisory is the authoritative source. CISA notification · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
9 mo ago

Exploit prediction

0.18% chance of exploitation in the next 30 days, higher than 7% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CISA ADP 3.1 5.5 CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
CNA 3.1 5.5 CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
OSV 3.1 5.5 CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Affected packages

ecosystem package affected fixed in
julia OpenSSL_jll
<3.0.20+0
>=3.5.0+0, <3.5.5+0
3.0.20+0
3.5.5+0
julia Openresty_jll
>=1.19.9+0, <1.29.203+0
1.29.203+0

Affected products

  • OpenSSL OpenSSL
  • Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem

Classification

Weakness
  • CWE-754 Improper Check for Unusual or Exceptional Conditions
Technology feeds

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.