Vulnerability · Published Mar 6, 2026 · Assigned by GitHub_M
CVE-2026-28799PJSIP: Heap use-after-free in PJSIP presence subscription termination handler
High 8.7
In plain English
A high-severity use-after-free in pjproject from pjsip. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 26% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine:v3.24 | pjproject | 2.17-r0 | ALPINE-CVE-2026-28799 |
| Debian:14 | asterisk | 1:22.10.0+dfsg+~cs6.17.60671434-1 | DEBIAN-CVE-2026-28799 |
Affected products (as reported)
Weakness: CWE-416 · Vector: 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