CVE-2026-28799
7.5
HIGH
CVSS 3.1
EPSS 0.29%
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.
How to fix CVE-2026-28799
To remediate CVE-2026-28799, upgrade the affected package to a fixed version below.
- Debian/asterisk—upgrade to 1:16.28.0~dfsg-0+deb11u10 or later
Is CVE-2026-28799 being exploited?
Low — EPSS is 0.3%, meaning exploitation activity has not been observed at scale.
Affected packages (1)
- from 0, < 1:16.28.0~dfsg-0+deb11u10
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | HIGH7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |