Use-after-free in pjsip - #VU155834
Published: October 15, 2026
Vulnerability identifier: #VU155834
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-416
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 use-after-free in the pj_ice_sess_on_rx_pkt() and pj_ice_sess_send_data() functions in ice_session.c when an ICE session is restarted while application data is being received. A remote attacker can restart ICE during a call, for example by sending a re-INVITE with new ICE credentials while media is being received, to cause a denial of service.
Only applications that use ICE are affected, including PJSUA-LIB and PJSUA2 applications with ICE enabled for media.
Affected software
pjsip
Remediation
Install security update from vendor's website.
pjsip - update to 2.18