Reachable assertion in pjsip - #VU165888
Published: November 11, 2026
Vulnerability identifier: #VU165888
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-617
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 aborting applications using the PJSIP transaction layer.
The vulnerability exists due to a reachable assertion in the INVITE server transaction handler when requests with mismatched request-line and CSeq methods are matched to acknowledged INVITE transactions with assertions enabled. A remote attacker can send crafted requests whose Via branch and CSeq method select such a transaction to trigger the assertion and terminate the process.
Affected software
pjsip
Remediation
Install security update from vendor's website.
pjsip - update to 2.18