CVE-2026-26203

MEDIUM

6.5

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.

CVE Details

CVSS v3.1 Score6.5

SeverityMEDIUM

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

Attack VectorLOCAL

ComplexityLOW

Privileges RequiredLOW

User InteractionNONE

Published2/19/2026

Last Modified2/20/2026

Sourcenvd

Honeypot Sightings0

Affected Products

pjsip:pjsip

Weaknesses (CWE)

CWE-416

References

https://github.com/pjsip/pjproject/commit/5aee54f09d4f91538d55279d7316591b28fded6c(security-advisories@github.com)

https://github.com/pjsip/pjproject/security/advisories/GHSA-p965-mf7j-gwv8(security-advisories@github.com)

IOC Correlations

No correlations recorded

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