Stack-based buffer overflow in pjsip - #VU156283
Published: October 21, 2026
Vulnerability identifier: #VU156283
CSH Severity: Medium
CVSS v4: 8.2 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: N/A
CWE-ID: CWE-121
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause a denial of service by crashing the application.
The vulnerability exists due to a stack-based buffer overflow in update_render_state() in pjmedia/src/pjmedia/vid_conf.c when rebuilding the render state for a sink connected to five or more video sources. A remote attacker can change the frame size of a connected video source to trigger writes beyond two four-entry stack arrays and cause an application crash.
Affected software
pjsip
Remediation
Install security update from vendor's website.
pjsip - update to 2.18