Use-after-free in pjsip - CVE-2026-28799

 

Use-after-free in pjsip - CVE-2026-28799

Published: March 6, 2026


Vulnerability identifier: #VU123622
CSH Severity: High
CVSS v4: 9.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-28799
CWE-ID: CWE-416
Exploitation vector: Remote access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote attacker to compromise vulnerable system.

The vulnerability exists due to a use-after-free error in the presence subscription termination handler. A remote attacker can execute arbitrary code on the target system.


Affected software

pjsip
Asterisk Open Source
Certified Asterisk

How to mitigate CVE-2026-28799

Install updates from vendor's website.

pjsip - update to 2.17
Asterisk Open Source - addressed in versions 20.19.0, 21.12.2, 22.9.0, 23.3.0
Certified Asterisk - addressed in versions 20.7-cert10, 22.8-cert2

External References

Related Security Bulletins