Use-after-free in pjsip - #VU155836
Published: October 15, 2026
Vulnerability identifier: #VU155836
CSH Severity: High
CVSS v4: 8.8 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: N/A
CWE-ID: CWE-416
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to disclose application memory or cause a denial of service.
The vulnerability exists due to use-after-free in the PJSUA2 callbacks in endpoint.cpp when returning application-supplied values to PJSUA-LIB. A remote attacker can send an INVITE with a Replaces header, a REFER, or a SUBSCRIBE to disclose application memory or cause a denial of service.
Exploitation requires an application that customizes the affected callback values, such as response reasons, response headers and bodies, or SRTP crypto keys, or sets a custom Call-ID in a call setting. Applications using the PJSUA-LIB C API directly are not affected.
Affected software
pjsip
Remediation
Install security update from vendor's website.
pjsip - update to 2.18