CVE-2026-26203 | THREATINT

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.

PUBLISHED Reserved 2026-02-11 | Published 2026-02-19 | Updated 2026-02-19 | Assigner GitHub_M

MEDIUM: 5.1CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:N/SA:L

Problem types

CWE-416: Use After Free

Product status

< 2.17

affected

References

github.com/...roject/security/advisories/GHSA-p965-mf7j-gwv8

github.com/...ommit/5aee54f09d4f91538d55279d7316591b28fded6c

cve.org (CVE-2026-26203)

nvd.nist.gov (CVE-2026-26203)

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