Stack-based buffer overflow in pjsip - CVE-2026-57163
Published: August 3, 2026
Vulnerability identifier: #VU140812
CSH Severity: High
CVSS v4: 9.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-57163
CWE-ID: CWE-121
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to execute arbitrary code or cause a denial of service.
The vulnerability exists due to stack-based buffer overflow in tls_cert_get_info() in ssl_sock_gtls.c when parsing the Subject Alternative Name extension of a peer certificate during the TLS handshake. A remote attacker can present a crafted certificate to execute arbitrary code or cause a denial of service.
Only builds using the GnuTLS backend are vulnerable, and the issue can be triggered before any SIP-level authentication.
Affected software
pjsip
How to mitigate CVE-2026-57163
Cybersecurity Help is currently unaware of any official solution to address this vulnerability.