CVE-2026-28799: Pjsip

High severity, CVSS 7.5. EPSS: 0.5% chance of exploitation in the next 30 days.

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.

Affected products

• Pjsip Pjsip: before 2.17 (fixed in 2.17)

Published 2026-03-06. Last modified 2026-06-17.