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Fencer Vulns
medium 6.1

CVE-2025-11187 json

Improper validation of PBMAC1 parameters in PKCS#12 MAC verification

published 2026-01-27 9 mo ago modified 2026-07-18 3 mo ago also EUVD-2025-206402 , GHSA-hpc7-gcqm-58fv , JLSEC-2026-255

cvss
6.1
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
5.2%
EPSS 5.2% chance of exploitation in 30 days, percentile 92%
public exploits
0
none known

Summary

Issue summary: PBMAC1 parameters in PKCS#12 files are missing validation which can trigger a stack-based buffer overflow, invalid pointer or NULL pointer dereference during MAC verification.

Impact summary: The stack buffer overflow or NULL pointer dereference may cause a crash leading to Denial of Service for an application that parses untrusted PKCS#12 files. The buffer overflow may also potentially enable code execution depending on platform mitigations.

When verifying a PKCS#12 file that uses PBMAC1 for the MAC, the PBKDF2 salt and keylength parameters from the file are used without validation. If the value of keylength exceeds the size of the fixed stack buffer used for the derived key (64 bytes), the key derivation will overflow the buffer. The overflow length is attacker-controlled. Also, if the salt parameter is not an OCTET STRING type this can lead to invalid or NULL pointer dereference.

Exploiting this issue 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 this reason the issue was assessed as Moderate severity.

The FIPS modules in 3.6, 3.5 and 3.4 are not affected by this issue, as PKCS#12 processing is outside the OpenSSL FIPS module boundary.

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

OpenSSL 3.3, 3.0, 1.1.1 and 1.0.2 are not affected by this issue as they do not support PBMAC1 in PKCS#12.

Patch / fix

  • julia OpenSSL_jll 3.5.5+0
  • OpenSSL OpenSSL 3.4.4, 3.5.5, 3.6.1
  • openssl Debian 13 3.5.4-1~deb13u2
  • openssl Debian 14 3.5.5-1

debian advisories DEBIAN-CVE-2025-11187

  • openssl Ubuntu 25.10 3.5.3-1ubuntu3
  • openssl Ubuntu 26.04 LTS 3.5.5-1ubuntu1

ubuntu advisories UBUNTU-CVE-2025-11187

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-2026:1496RHSA-2026:1473RHSA-2026:1472

  • openssl-3-livepatches Linux Micro 6.1 0.4-slfo.1.1_1.1
  • openssl-3-livepatches SLES 16.0, Linux Micro 6.2, SLES for SAP applications 16.0 0.3-160000.1.1
  • openssl-3 SLES 16.0, Linux Micro 6.2, SLES for SAP applications 16.0 3.5.0-160000.5.1
  • openssl-3-livepatches SLE Live Patching 15 SP7 0.4-150700.16.6.1
  • openssl-3-livepatches SLE Live Patching 15 SP6 0.4-150600.13.11.1

suse advisories SUSE-SU-2026:2662-1SUSE-SU-2026:2411-1SUSE-SU-2026:22143-1SUSE-SU-2026:20542-1SUSE-SU-2026:20607-1SUSE-SU-2026:20211-1

  • 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 3.24, Alpine 3.23, Alpine 3.22 3.5.5-r0

alpine advisories ALPINE-CVE-2025-11187

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

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-2025-11187 updated cvss 6.1

openssl: OpenSSL: Arbitrary code execution or denial of service through crafted PKCS#12 file

  • 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 Red Hat OpenShift Container Platform 4 openshift/ose-rhel-coreos-8
    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 AppStream EUS (v. 10.0) openssl-perl 3.2.2-16.el10_0.6
    fixed: vendor fix RHSA-2026:1496
  • 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
show 6 more
  • 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
  • Red Hat Enterprise Linux BaseOS EUS (v. 10.0) openssl 3.2.2-16.el10_0.6, openssl-libs 3.2.2-16.el10_0.6
    fixed: vendor fix RHSA-2026:1496
  • 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 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 AppStream EUS (v. 10.0) openssl-debuginfo 3.2.2-16.el10_0.6, openssl-debugsource 3.2.2-16.el10_0.6, openssl-libs-debuginfo 3.2.2-16.el10_0.6 Red Hat Enterprise Linux BaseOS EUS (v. 10.0) openssl-debuginfo 3.2.2-16.el10_0.6, openssl-debugsource 3.2.2-16.el10_0.6, openssl-libs-debuginfo 3.2.2-16.el10_0.6
    +2 more products
    Red Hat OpenShift Container Platform 4 openshift/ose-rhel-coreos-9 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 SSVC

Exploitation
Proof of concept is public
Automatable
no
Technical impact
total
Assessed
7 mo ago

Exploit prediction

5.23% chance of exploitation in the next 30 days, higher than 92% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/metadust/CVE-2025-11187 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CISA ADP 3.1 6.1 CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:H
CNA 3.1 6.1 CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:H
OSV 3.1 6.1 CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:H

Affected packages

ecosystem package affected fixed in
julia OpenSSL_jll
>=3.5.0+0, <3.5.5+0
3.5.5+0

Affected products

  • OpenSSL OpenSSL

Classification

Weakness
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.