🛡️ CVE-2026-26203 — pjsip

🟡 CVSS 6.5 — Medium ✅ No Known Exploit CWE-416 NVD

6.5

CVSS Score

0 Low4 Medium7 High9 Critical10

Description

PJSIP is a free and open source multimedia communication library. Versions prior to 2.17 have a critical heap buffer underflow vulnerability in PJSIP's H.264 packetizer. The bug occurs when processing malformed H.264 bitstreams without NAL unit start codes, where the packetizer performs unchecked pointer arithmetic that can read from memory located before the allocated buffer. Version 2.17 contains a patch for the issue.

How this vulnerability can be exploited

This issue can be reached with local access to the system, attack complexity is low, an attacker needs low-level privileges on the target. No user interaction is required. The scope is changed, meaning a successful attack can affect components beyond the vulnerable one. Rated impact: confidentiality none, integrity none, availability high.

Weakness class

CVE-2026-26203 is classified as CWE-416: Use After Free. Memory is used after being released, so its contents may already belong to something else.

Affected software

CVE-2026-26203 is recorded against 1 package.

pjsip (fixed in 2.17)

Timeline and source

Published on 19 February 2026 and last revised on 17 June 2026. No public exploit is currently recorded for this entry. A vendor advisory or fix has been published. Record sourced from NVD.

References

github.com
github.com

CVE-2026-26203 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Alpine Debian Ubuntu

Details

Severity MEDIUM

CVSS Score 6.5

CVSS Vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H

CWE CWE-416

Public Exploit ✅ No

Source NVD

Published 2026-02-19

Updated 2026-08-11

Modified 2026-06-17

Fix URL https://github.com/pjsip/pjproject/commit/5aee54f09d4f91538d55279d7316591b28fded6c

Affected Packages

Software	From version	Fixed in
pjsip	—	2.17

References

Patch https://github.com/pjsip/pjproject/commit/5aee54f09d4f91538d55279d7316591b28fded6c

Patch, Vendor Advisory https://github.com/pjsip/pjproject/security/advisories/GHSA-p965-mf7j-gwv8

🔗 NVD 🔗 Mitre ✅ Fix / Advisory

Similar Threats

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