Uncontrolled Recursion in pjsip - #VU142524
Published: August 14, 2026
Vulnerability identifier: #VU142524
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-674
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to uncontrolled recursion in the pj_xml_parse() XML parser when parsing deeply nested XML documents in incoming SIP request bodies. A remote attacker can send a specially crafted SIP request with a deeply nested XML body to cause a denial of service.
The issue is reachable through XML bodies used by the presence/PIDF, dialog-info, and message-composition event packages, and production builds are affected because the existing recursion guard is only effective in debug builds.
Affected software
pjsip
Remediation
Install security update from vendor's website.
pjsip - update to 2.18