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Vulnerability record · CVE-2026-57163 · published 4 September 2026

CVE-2026-57163: Teluu pjsip stack-based buffer overflow vulnerability

Teluu · Pjsip

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.

8.8 CVSS 4.0 High EPSS 0.40% · top 68.2% CWE-121 · Stack-based buffer overflow
8.8CVSS 4.0 base score
0.40%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References
11 Sep 2026Last modified by NVD

Description

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.

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/pjsip/pjproject/commit/c4a151af86fadd16d9480b2603eeb2abf4fb4f78 Patch
https://github.com/pjsip/pjproject/security/advisories/GHSA-jm2j-6rg6-qvwx PatchVendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2023-38703Teluu pjsip use after free vulnerabilityPJSIP is a free and open source multimedia communication library written in C with high level API in C, C++, Java, C#, and Python languages. SRTP is …EPSS 1.3%9.8CVE-2022-23537Teluu pjsip heap-based buffer overflow vulnerabilityPJSIP is a free and open source multimedia communication library written in C language implementing standard based protocols such as SIP, SDP, RTP, S…EPSS 1.0%9.8CVE-2022-31031Teluu pjsip classic buffer overflow vulnerabilityPJSIP is a free and open source multimedia communication library written in C language implementing standard based protocols such as SIP, SDP, RTP, S…EPSS 2.0%9.8CVE-2022-24754Teluu pjsip classic buffer overflow vulnerabilityPJSIP is a free and open source multimedia communication library written in C language. In versions prior to and including 2.12 PJSIP there is a stac…EPSS 2.1%9.8CVE-2022-23608Teluu pjsip use after free vulnerabilityPJSIP is a free and open source multimedia communication library written in C language implementing standard based protocols such as SIP, SDP, RTP, S…EPSS 4.0%9.8CVE-2021-43299Teluu pjsip stack-based buffer overflow vulnerabilityStack overflow in PJSUA API when calling pjsua_player_create. An attacker-controlled 'filename' argument may cause a buffer overflow since it is copi…EPSS 2.5%9.8CVE-2021-43300Teluu pjsip stack-based buffer overflow vulnerabilityStack overflow in PJSUA API when calling pjsua_recorder_create. An attacker-controlled 'filename' argument may cause a buffer overflow since it is co…EPSS 2.4%9.8CVE-2021-43301Teluu pjsip stack-based buffer overflow vulnerabilityStack overflow in PJSUA API when calling pjsua_playlist_create. An attacker-controlled 'file_names' argument may cause a buffer overflow since it is …EPSS 2.4%

Source: NIST National Vulnerability Database (record CVE-2026-57163), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.