CVE-2026-28799

PJSIP: Heap use-after-free in PJSIP presence subscription termination handler

State: Published
Severity: 8.7 High
Published: Mar 6, 2026
Updated: Mar 9, 2026
Reserved: Mar 3, 2026

Description

PJSIP is a free and open source multimedia communication library written in C. Prior to version 2.17, a heap use-after-free vulnerability exists in PJSIP's event subscription framework (evsub.c) that is triggered during presence unsubscription (SUBSCRIBE with Expires=0). This issue has been patched in version 2.17.

Scores

CVSS	Score	Vector	Source
4.0	8.7 High	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N	GitHub_M

Weaknesses

CWE-416 Use After Free

Affected Products

Product	Versions
pjprojectpjsip	< 2.17Affected

References

https://github.com/pjsip/pjproject/security/advisories/GHSA-8fj4-fv9f-hjpc
https://github.com/pjsip/pjproject/commit/e06ff6c64741cc1675fd3296615910f532f6b1a1

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