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Fencer Vulns
medium 6.2

CVE-2026-13757 json

P11-kit: stack exhaustion via unbounded recursion in rpc attribute parsing

published 2026-06-29 4 mo ago modified 2026-11-06 3 d ago also EUVD-2026-40173

cvss
6.2
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 4%
public exploits
0
none known

Summary

A flaw was found in p11-kit. The RPC message attribute parsing functions p11_rpc_message_get_attribute() and p11_rpc_message_get_attribute_array_value() form a mutually-recursive call chain with no recursion depth limit when processing nested CKA_WRAP_TEMPLATE, CKA_UNWRAP_TEMPLATE, and CKA_DERIVE_TEMPLATE attributes. An unauthenticated attacker with local access to the p11-kit RPC Unix domain socket can send a specially crafted request with deeply nested template attributes, causing stack exhaustion and crashing the p11-kit server process and its dependent services.

Patch / fix

  • Red Hat Red Hat Enterprise Linux 10 0:0.26.4-1.el10_2
  • Red Hat Red Hat Enterprise Linux 9 0:0.26.4-1.el9_8
  • Red Hat Cert Manager support for Red Hat OpenShift release 1.17 1791371069, 1791371080, 1791378395, 1791788287, 1791970484
  • Red Hat Cert Manager support for Red Hat OpenShift release 1.18 1789029076, 1791459707, 1791459711, 1791459759, 1791966259
  • Red Hat Cert Manager support for Red Hat OpenShift release 1.20 1790223279, 1790223719, 1790272426, 1790589855, 1790589912, 1790589914, 1790589998, 1790598593
  • Red Hat Cost Management 4 1790844333
  • Red Hat Red Hat Discovery 2 1786634825, 1786638573
  • Red Hat Red Hat Hardened Images 0.26.2-1.2.hum1, 0.26.4-1.hum1
  • Red Hat Red Hat Insights proxy 1.5 1786433656
  • Red Hat Red Hat Update Infrastructure 5 1786435241, 1786435483, 1786533449, 1786533457, 1786533529, 1787135742, 1787241211, 1787241260
  • p11-kit Debian 14 0.26.4-1

debian advisories DEBIAN-CVE-2026-13757

  • p11-kit Ubuntu 22.04 LTS 0.24.0-6ubuntu0.1
  • p11-kit Ubuntu 24.04 LTS 0.25.3-4ubuntu2.2
  • p11-kit Ubuntu Pro 18.04 LTS 0.23.9-2ubuntu0.1+esm1
  • p11-kit Ubuntu Pro 20.04 LTS 0.23.20-1ubuntu0.1+esm1

ubuntu advisories UBUNTU-CVE-2026-13757

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

  • p11-kit RHEL 10.2 0.26.4-1.el10_2
  • p11-kit-trust RHEL 10.2 0.26.4-1.el10_2
  • p11-kit-client RHEL 10.2 0.26.4-1.el10_2
  • p11-kit-server RHEL 10.2 0.26.4-1.el10_2
  • p11-kit RHEL 9 0.26.4-1.el9_8
  • p11-kit-trust RHEL 9 0.26.4-1.el9_8
  • p11-kit-client RHEL 9 0.26.4-1.el9_8
  • p11-kit-server RHEL 9 0.26.4-1.el9_8

red hat advisories RHSA-2026:49668RHSA-2026:49667RHSA-2026:38342RHSA-2026:37469

  • p11-kit SLES 16.0, Linux Micro 6.2, SLES for SAP applications 16.0 0.25.5-160000.3.1

suse advisories SUSE-SU-2026:24193-1SUSE-SU-2026:24255-1

  • p11-kit openSUSE Leap 16.0 0.25.5-160000.3.1
  • p11-kit openSUSE Tumbleweed 0.26.5-1.1

opensuse advisories openSUSE-SU-2026:22105-1openSUSE-SU-2026:11862-1

  • p11-kit AlmaLinux 9 0.26.4-1.el9_8
  • p11-kit-trust AlmaLinux 9 0.26.4-1.el9_8
  • p11-kit-client AlmaLinux 9 0.26.4-1.el9_8
  • p11-kit-server AlmaLinux 9 0.26.4-1.el9_8
  • p11-kit AlmaLinux 10 0.26.4-1.el10_2
  • p11-kit-trust AlmaLinux 10 0.26.4-1.el10_2
  • p11-kit-client AlmaLinux 10 0.26.4-1.el10_2
  • p11-kit-server AlmaLinux 10 0.26.4-1.el10_2

almalinux advisories ALSA-2026:49667ALSA-2026:49668

  • p11-kit Rocky Linux 10 0.26.4-1.el10_2
  • p11-kit Rocky Linux 9 0.26.4-1.el9_8

rocky linux advisories RLSA-2026:49668RLSA-2026:49667

  • p11-kit Azure Linux 3.0 0.26.5-1

azure linux advisories AZL-91743

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-2026-13757 updated cvss 6.2

p11-kit: Stack exhaustion via unbounded recursion in RPC attribute parsing

  • Red Hat Enterprise Linux 6 p11-kit, p11-kit-trust Red Hat Enterprise Linux 7 p11-kit, p11-kit-trust Red Hat Enterprise Linux 8 p11-kit, p11-kit-trust, p11-kit-server Red Hat OpenShift Container Platform 4 openshift/ose-rhel-coreos-8, openshift/ose-rhel-coreos-9 Red Hat OpenShift Container Platform 5 openshift/ose-rhel-coreos-9
    affected: workaround, no fix available “Fix deferred”
  • Red Hat Cert Manager support for Red Hat OpenShift release 1.17 cert-manager/cert-manager-operator-rhel9 1791788287, cert-manager/jetstack-cert-manager-rhel9 1791371069, cert-manager/cert-manager-istio-csr-rhel9 1791378395, cert-manager/cert-manager-operator-bundle 1791970484, cert-manager/jetstack-cert-manager-acmesolver-rhel9 1791371080
    fixed: vendor fix RHSA-2026:82336
  • 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 Cert Manager support for Red Hat OpenShift release 1.20 cert-manager/cert-manager-operator-rhel9 1790272426, cert-manager/cert-manager-operator-rhel9 1790589855, cert-manager/jetstack-cert-manager-rhel9 1790223279, cert-manager/jetstack-cert-manager-rhel9 1790589912, cert-manager/cert-manager-istio-csr-rhel9 1790223719, cert-manager/cert-manager-istio-csr-rhel9 1790589914, +2 more
    fixed: vendor fix RHSA-2026:72475
  • Red Hat Cost Management 4 costmanagement/costmanagement-metrics-rhel9-operator 1790844333
    fixed: vendor fix RHSA-2026:81201
  • Red Hat Discovery 2 discovery/discovery-ui-rhel9 1786634825, discovery/discovery-server-rhel9 1786638573
    fixed: vendor fix RHSA-2026:54760
  • Red Hat Enterprise Linux AppStream (v. 9) p11-kit-server 0.26.4-1.el9_8
    fixed: vendor fix RHSA-2026:49667
  • Red Hat Enterprise Linux AppStream (v. 10) p11-kit-server 0.26.4-1.el10_2
    fixed: vendor fix RHSA-2026:49668
show 6 more
  • Red Hat Enterprise Linux BaseOS (v. 9) p11-kit 0.26.4-1.el9_8, p11-kit-trust 0.26.4-1.el9_8, p11-kit-client 0.26.4-1.el9_8
    fixed: vendor fix RHSA-2026:49667
  • Red Hat Enterprise Linux BaseOS (v. 10) p11-kit 0.26.4-1.el10_2, p11-kit-trust 0.26.4-1.el10_2, p11-kit-client 0.26.4-1.el10_2
    fixed: vendor fix RHSA-2026:49668
  • Red Hat Hardened Images p11-kit 0.26.4-1.hum1, p11-kit 0.26.2-1.2.hum1, p11-kit-trust 0.26.4-1.hum1, p11-kit-client 0.26.4-1.hum1, p11-kit-server 0.26.4-1.hum1, mingw32-p11-kit 0.26.4-1.hum1, +6 more
    fixed: vendor fix RHSA-2026:37469
  • Red Hat Insights proxy 1.5 insights-proxy/insights-proxy-container-rhel9 1786433656
    fixed: vendor fix RHSA-2026:53371
  • Red Hat Update Infrastructure 5 rhui5/cds-rhel9 1786533457, rhui5/rhua-rhel9 1786533529, rhui5/haproxy-rhel9 1786533449, rhui5/rhua-tp-rhel9 1787241260, rhui5/installer-rhel9 1786435483, rhui5/installer-tp-rhel9 1787135742, +2 more
    fixed: vendor fix RHSA-2026:54387
  • Red Hat Cert Manager support for Red Hat OpenShift release 1.20 cert-manager/jetstack-cert-manager-acmesolver-rhel9 1790223630 Red Hat Cost Management 4 costmanagement/costmanagement-metrics-operator-bundle 1790851152 Red Hat OpenShift AI (RHOAI) rhoai/odh-llama-stack-k8s-operator-rhel9 Red Hat Update Infrastructure 5 rhui5/cds-tp-rhel9 1787241206
    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
none
Automatable
no
Technical impact
partial
Assessed
4 mo ago

Exploit prediction

0.15% chance of exploitation in the next 30 days, higher than 4% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 6.2 CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

  • Red Hat Red Hat Enterprise Linux 10
  • Red Hat Red Hat Enterprise Linux 9
  • Red Hat Cert Manager support for Red Hat OpenShift release 1.17
  • Red Hat Cert Manager support for Red Hat OpenShift release 1.18
  • Red Hat Cert Manager support for Red Hat OpenShift release 1.20
  • Red Hat Cost Management 4
  • Red Hat Red Hat Discovery 2
  • Red Hat Red Hat Hardened Images
  • Red Hat Red Hat Insights proxy 1.5
  • Red Hat Red Hat Update Infrastructure 5
  • Red Hat Red Hat Enterprise Linux 6
  • Red Hat Red Hat Enterprise Linux 7
  • Red Hat Red Hat Enterprise Linux 8
  • Red Hat Red Hat OpenShift AI (RHOAI)
  • Red Hat Red Hat OpenShift Container Platform 4
  • Red Hat Red Hat OpenShift Container Platform 5

Classification

Weakness

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.