CVE-2026-57163

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CVE-2026-57163

Summary: PJSIP: Stack overflow parsing a TLS peer certificate's SubjectAltName in GnuTLS backend

Details: PJSIP is a free and open source multimedia communication library written in C. Prior to commit c4a151a, a stack buffer overflow exists in the GnuTLS TLS backend when parsing the Subject Alternative Name extension of a peer certificate (tls_cert_get_info() in ssl_sock_gtls.c). Only GnuTLS builds are affected (--with-gnutls); OpenSSL and Apple SecureTransport/Network.framework builds are not affected. While extracting certificate information after a TLS handshake, an incorrect buffer-size value can cause an oversized SubjectAltName entry to be written past the end of a fixed-size stack buffer. A network-positioned attacker presenting a crafted certificate — a malicious server to a connecting client, or a malicious client to a server that requests certificates — can trigger this during the TLS handshake, before any SIP-level authentication. Impact may range from unexpected application termination to control flow hijack/memory corruption. This issue has been patched via commit c4a151a.

References: https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/57xxx/CVE-2026-57163.json, https://github.com/pjsip/pjproject/security/advisories/GHSA-jm2j-6rg6-qvwx, https://nvd.nist.gov/vuln/detail/CVE-2026-57163, https://github.com/pjsip/pjproject/commit/c4a151af86fadd16d9480b2603eeb2abf4fb4f78