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CVE-2026-57163

9.1, critical

Pjsip pjproject Stack-based Buffer Overflow Vulnerability

NVD (opens in a new tab) CVE.org (opens in a new tab)
CVSS
9.1, critical critical CVSS v3.1
EPSS, next 30 days
0.4% higher than 32.8% of scored CVEs
Exploitation
No public evidence
Published
4 Sept 2026a month ago

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.

Details

Vendor
Pjsip
Product
pjproject
Weakness
CWE-121 (opens in a new tab)
Status
Analyzed
Updated
11 Sept 2026
Assigner
security-advisories@github.com

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H

References 2

Patches and fixes 2

The kind is read from NVD's tags where present and from the shape of the URL otherwise, so treat it as a hint.

Other Pjsip CVEs

Every Pjsip CVE we hold

Same vendor in what we hold, not a known link between the flaws.

  • CVE-2026-77396 Pjsip pjproject Heap-based Buffer Overflow Vulnerability EPSS 0.2% 7.1, high
  • CVE-2026-57162 Pjsip pjproject Stack-based Buffer Overflow Vulnerability EPSS 0.6% 9.1, critical
  • CVE-2026-57159 PJSIP is a free and open source multimedia communication library written in C EPSS 0.6% 7.5, high
  • CVE-2026-57161 Pjsip pjproject Stack-based Buffer Overflow Vulnerability EPSS 0.5% 8.2, high

Beyond this page

Is CVE-2026-57163 in your network?

This page tells you how dangerous CVE-2026-57163 is out there. Whether it sits on one of your devices, only a scan of your own network can tell. That is what our systems do, every day, for the companies we protect.

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  • EXYS7950 KONDRA

    Detect it if it's exploited

    Until the patch is applied, Kondra monitors your network, events and endpoints in real time. It keeps an inventory of the software installed on every endpoint, and its anomaly detection rules flag what an attacker does once inside.

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Check your exposure

Assembled from the NVD 2.0 API, the CISA Known Exploited Vulnerabilities Catalog and FIRST EPSS. Scores are as of our last collection on 17 Oct 2026, not the live upstream state.