NULL pointer dereference in pjsip - #VU165889
Published: November 11, 2026
Vulnerability identifier: #VU165889
CSH Severity: Medium
CVSS v4: 8.7 [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]
CVE-ID: N/A
CWE-ID: CWE-476
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to crash applications using pjsua-lib or PJSUA2, causing a denial of service.
The vulnerability exists due to a null pointer dereference in pjsua-lib's SDP offer handling when a disabled media line lacks connection information at both media and session levels. A remote attacker can send a crafted INVITE to an application accepting incoming calls with a configured account, or a re-INVITE or UPDATE during an established call, to crash the process.
Affected software
pjsip
Remediation
Install security update from vendor's website.
pjsip - update to 2.18