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[USN-8687-1] p11-kit vulnerabilities

Posted on 31 August 2026
Ubuntu Security

==========================================================================Ubuntu Security Notice USN-8687-1
August 27, 2026

p11-kit vulnerabilities
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 24.04 LTS
- Ubuntu 22.04 LTS
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS

Summary:

p11-kit could be made to crash if it received specially crafted input.

Software Description:
- p11-kit: p11-glue utilities

Details:

It was discovered that p11-kit incorrectly handled certain RPC messages. A
local attacker could use this issue to cause p11-kit to crash, resulting in
a denial of service. (CVE-2026-13757)

It was discovered that p11-kit incorrectly handled nested attribute
decoding on 32-bit systems. A local attacker could use this issue to cause
p11-kit to crash, resulting in a denial of service. (CVE-2026-18938)

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 24.04 LTS
libp11-kit0 0.25.3-4ubuntu2.2
p11-kit 0.25.3-4ubuntu2.2
p11-kit-modules 0.25.3-4ubuntu2.2

Ubuntu 22.04 LTS
libp11-kit0 0.24.0-6ubuntu0.1
p11-kit 0.24.0-6ubuntu0.1
p11-kit-modules 0.24.0-6ubuntu0.1

Ubuntu 20.04 LTS
libp11-kit0 0.23.20-1ubuntu0.1+esm1
Available with Ubuntu Pro
p11-kit 0.23.20-1ubuntu0.1+esm1
Available with Ubuntu Pro
p11-kit-modules 0.23.20-1ubuntu0.1+esm1
Available with Ubuntu Pro

Ubuntu 18.04 LTS
libp11-kit0 0.23.9-2ubuntu0.1+esm1
Available with Ubuntu Pro
p11-kit 0.23.9-2ubuntu0.1+esm1
Available with Ubuntu Pro
p11-kit-modules 0.23.9-2ubuntu0.1+esm1
Available with Ubuntu Pro

In general, a standard system update will make all the necessary changes.

References:
https://ubuntu.com/security/notices/USN-8687-1
CVE-2026-13757, CVE-2026-18938

Package Information:
https://launchpad.net/ubuntu/+source/p11-kit/0.25.3-4ubuntu2.2
https://launchpad.net/ubuntu/+source/p11-kit/0.24.0-6ubuntu0.1

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