Vulnerability Details CVE-2026-57163
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.002
EPSS Ranking 14.4%
CVSS Severity
CVSS v3 Score 9.1
Products affected by CVE-2026-57163
-
cpe:2.3:a:teluu:pjsip:0.5.0.1
-
cpe:2.3:a:teluu:pjsip:0.5.10
-
cpe:2.3:a:teluu:pjsip:0.5.10.1
-
cpe:2.3:a:teluu:pjsip:0.5.10.2
-
cpe:2.3:a:teluu:pjsip:0.5.10.3
-
cpe:2.3:a:teluu:pjsip:0.5.10.4
-
cpe:2.3:a:teluu:pjsip:0.5.2
-
cpe:2.3:a:teluu:pjsip:0.5.3
-
cpe:2.3:a:teluu:pjsip:0.5.4
-
cpe:2.3:a:teluu:pjsip:0.5.5.1
-
cpe:2.3:a:teluu:pjsip:0.5.6
-
cpe:2.3:a:teluu:pjsip:0.5.6.1
-
cpe:2.3:a:teluu:pjsip:0.5.7
-
cpe:2.3:a:teluu:pjsip:0.5.8
-
cpe:2.3:a:teluu:pjsip:0.5.9
-
cpe:2.3:a:teluu:pjsip:0.7.0
-
cpe:2.3:a:teluu:pjsip:0.8.0
-
cpe:2.3:a:teluu:pjsip:0.9.0
-
cpe:2.3:a:teluu:pjsip:1.0
-
cpe:2.3:a:teluu:pjsip:1.0.1
-
cpe:2.3:a:teluu:pjsip:1.0.2
-
cpe:2.3:a:teluu:pjsip:1.0.3
-
cpe:2.3:a:teluu:pjsip:1.1
-
cpe:2.3:a:teluu:pjsip:1.10
-
cpe:2.3:a:teluu:pjsip:1.12
-
cpe:2.3:a:teluu:pjsip:1.14
-
cpe:2.3:a:teluu:pjsip:1.14.2
-
cpe:2.3:a:teluu:pjsip:1.16
-
cpe:2.3:a:teluu:pjsip:1.2
-
cpe:2.3:a:teluu:pjsip:1.3
-
cpe:2.3:a:teluu:pjsip:1.4
-
cpe:2.3:a:teluu:pjsip:1.4.5
-
cpe:2.3:a:teluu:pjsip:1.5
-
cpe:2.3:a:teluu:pjsip:1.5.5
-
cpe:2.3:a:teluu:pjsip:1.6
-
cpe:2.3:a:teluu:pjsip:1.7
-
cpe:2.3:a:teluu:pjsip:1.8
-
cpe:2.3:a:teluu:pjsip:1.8.10
-
cpe:2.3:a:teluu:pjsip:1.8.5
-
cpe:2.3:a:teluu:pjsip:2.0
-
cpe:2.3:a:teluu:pjsip:2.0.1
-
cpe:2.3:a:teluu:pjsip:2.1
-
cpe:2.3:a:teluu:pjsip:2.10
-
cpe:2.3:a:teluu:pjsip:2.11
-
cpe:2.3:a:teluu:pjsip:2.11.1
-
cpe:2.3:a:teluu:pjsip:2.12
-
cpe:2.3:a:teluu:pjsip:2.12.1
-
cpe:2.3:a:teluu:pjsip:2.13
-
cpe:2.3:a:teluu:pjsip:2.13.1
-
cpe:2.3:a:teluu:pjsip:2.14
-
cpe:2.3:a:teluu:pjsip:2.14.1
-
cpe:2.3:a:teluu:pjsip:2.15
-
cpe:2.3:a:teluu:pjsip:2.15.1
-
cpe:2.3:a:teluu:pjsip:2.16
-
cpe:2.3:a:teluu:pjsip:2.17
-
cpe:2.3:a:teluu:pjsip:2.2
-
cpe:2.3:a:teluu:pjsip:2.2.1
-
cpe:2.3:a:teluu:pjsip:2.3
-
cpe:2.3:a:teluu:pjsip:2.4
-
cpe:2.3:a:teluu:pjsip:2.4.5
-
cpe:2.3:a:teluu:pjsip:2.5
-
cpe:2.3:a:teluu:pjsip:2.5.1
-
cpe:2.3:a:teluu:pjsip:2.5.5
-
cpe:2.3:a:teluu:pjsip:2.6
-
cpe:2.3:a:teluu:pjsip:2.7
-
cpe:2.3:a:teluu:pjsip:2.7.1
-
cpe:2.3:a:teluu:pjsip:2.7.2
-
cpe:2.3:a:teluu:pjsip:2.8
-
cpe:2.3:a:teluu:pjsip:2.9