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CVE-2026-26203

PJSIP's pjmedia-video has use-after-free in H264 packetizer when packetizing fragmented NAL

Published: Feb 19, 2026Updated: Feb 20, 2026 Sources: CVE List NVDCWE-416
NVD MITRE
6.5CVSSMEDIUM
EPSS Score
0.1%
Top 98.9%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

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.

CVSS Vector Breakdown

AV:LAC:LPR:LUI:NS:CC:NI:NA:H
Exploitability
AV:LAttack Vector
Local
AC:LAttack Complexity
Low
PR:LPrivileges Required
Low
UI:NUser Interaction
None
Scope
S:CScope
Changed
Impact
C:NConfidentiality
None
I:NIntegrity
None
A:HAvailability
High
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Weaknesses

CWE-416

Affected Products

pjsippjsip
Mixed
Communications / voip-telephony
pjmedia-videopjsip
Mixed
Communications / voip-telephony
pjsiposs-projectCommunicationsaka pjproject, pjmedia-video, pjsip

Attack Graph

Products CVE Techniques Tactics

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Exploitability

Official Patch Available

MITRE ATT&CK

2 techniques
Initial Access
Privilege Escalation
View detailed technique mapping

References

https://github.com/pjsip/pjproject/commit/5aee54f09d4f91538d55279d7316591b28fded6c
github.com
https://github.com/pjsip/pjproject/security/advisories/GHSA-p965-mf7j-gwv8
github.com

Timeline

Published
Feb 19, 2026
Last Updated
Feb 20, 2026

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