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.
- Score
- 8.8 high
- Published
- 2026-09-04
- Links
- NVD · cve.org · Report wrong data
Matched ports (1)
| Port | Package | Version | Status | Maintainer |
|---|---|---|---|---|
| net/pjsip | pjsip | 2.14.1 | unaddressed | oliver.epper@gmail.com |
Template for a VuXML entry
Range taken from the CVE record, check it before committing. make newentry in security/vuxml creates the vid.
<vuln vid="FIXME (make newentry)">
<topic>FIXME -- FIXME</topic>
<affects>
<package>
<name>pjsip</name>
<range><lt>FIXME</lt></range>
</package>
</affects>
<description>
<body xmlns="http://www.w3.org/1999/xhtml">
<p>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.</p>
</body>
</description>
<references>
<cvename>CVE-2026-57163</cvename>
<url>https://nvd.nist.gov/vuln/detail/CVE-2026-57163</url>
</references>
<dates>
<discovery>2026-09-04</discovery>
<entry>2026-10-26</entry>
</dates>
</vuln>