CVE-2026-57163 PUBLISHED

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

Assigner: GitHub_M
Reserved: 24.06.2026 Published: 04.09.2026 Updated: 04.09.2026

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.

Metrics

CVSS Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N
CVSS Score: 8.8

Product Status

Vendor pjsip
Product pjproject
Versions
  • Version < c4a151af86fadd16d9480b2603eeb2abf4fb4f78 is affected

References

Problem Types

  • CWE-121: Stack-based Buffer Overflow CWE