Use-after-free in pjsip - #VU156281
Published: October 21, 2026
Vulnerability identifier: #VU156281
CSH Severity: Medium
CVSS v4: 6.3 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:L/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 potentially disclose application memory or cause a denial of service.
The vulnerability exists due to use-after-free in the PJSIP SIP TCP and TLS transport functions tcp_create() and tls_create() when an application destroys a listener with a published address while connections created by that listener remain open. A remote attacker can interact with a surviving connection to potentially receive application memory through references to freed listener data or cause unexpected application termination.
Affected software
pjsip
Remediation
Install security update from vendor's website.
pjsip - update to 2.18