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.

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Fixes

Solution

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Workaround

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History

Fri, 20 Feb 2026 10:15:00 +0000

Type Values Removed Values Added
First Time appeared Pjsip
Pjsip pjmedia-video
Vendors & Products Pjsip
Pjsip pjmedia-video

Fri, 20 Feb 2026 01:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Thu, 19 Feb 2026 20:00:00 +0000

Type Values Removed Values Added
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.
Title PJSIP's pjmedia-video has use-after-free in H264 packetizer when packetizing fragmented NAL
Weaknesses CWE-416
References
Metrics cvssV4_0

{'score': 5.1, 'vector': 'CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:N/SA:L'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-02-19T21:22:31.050Z

Reserved: 2026-02-11T19:56:24.814Z

Link: CVE-2026-26203

cve-icon Vulnrichment

Updated: 2026-02-19T21:15:32.089Z

cve-icon NVD

Status : Received

Published: 2026-02-19T20:25:43.113

Modified: 2026-02-19T20:25:43.113

Link: CVE-2026-26203

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-02-20T09:54:14Z

Weaknesses