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CVE-2026-57163— PJSIP: Stack overflow parsing a TLS peer certificate's SubjectAltName in GnuTLS backend

Quick assessment

Affected
pjsip pjproject
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

PJSIP 是一个用 C 语言编写的免费开源多媒体通信库。在提交 c4a151a 之前，GnuTLS TLS 后端在解析对端证书的“主题备用名称”（Subject Alternative Name）扩展时存在栈缓冲区溢出漏洞（位于 中的 函数）。仅 GnuTLS 构建版本受影响（使用 参数编译的版本）；OpenSSL 以及 Apple SecureTransport/Network.framework 构建版本不受影响。 在 TLS 握手后提取证书信息时，错误的缓冲区大小值可能导致过长的 SubjectAltNam

CVSS 8.8 · High

Affected Version Matrix 1

VendorProduct Version RangeStatus
pjsip pjproject < c4a151af86fadd16d9480b2603eeb2abf4fb4f78 affected
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I. Basic Information for CVE-2026-57163

Vulnerability Information
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Vulnerability Title
PJSIP: Stack overflow parsing a TLS peer certificate's SubjectAltName in GnuTLS backend
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
栈缓冲区溢出
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
pjsip pjproject < c4a151af86fadd16d9480b2603eeb2abf4fb4f78 -

II. Public POCs for CVE-2026-57163

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III. Intelligence Information for CVE-2026-57163

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Patches & Fixes for CVE-2026-57163 (1)

Vendor Advisories for CVE-2026-57163 (1)

Same Patch Batch · pjsip · 2026-09-04 · 8 CVEs total

CVE-2026-57162 8.8 HIGH PJSIP: Stack overflow parsing SDP a=crypto attributes
CVE-2026-57161 8.8 HIGH PJSIP: Stack overflow handling Service-Route headers in a registration response
CVE-2026-57159 8.4 HIGH PJSIP: SDP parser out-of-bounds write in remote payload-type map maintenance
CVE-2026-57164 8.3 HIGH PJSIP: Heap overflow in the HTTP client
CVE-2026-57160 6.9 MEDIUM PJSIP: SIP message header buffer overflow
CVE-2026-57165 6.3 MEDIUM PJSIP: Pre-authentication overflow in the telnet CLI history
CVE-2026-57166 6.3 MEDIUM PJSIP: Pre-authentication overflow in the telnet CLI error

IV. Related Vulnerabilities

Same product: pjproject
Same vendor: pjsip
Same weakness: CWE-121

V. Comments for CVE-2026-57163

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