CVE-2026-57163: PJSIP is a free and open source multimedia communication library written in C

Q: How do I fix CVE-2026-57163?

pjsip: upgrade to newer than 2.17. Exact commands for each OS are on this page.

Q: Is CVE-2026-57163 being exploited?

CVE-2026-57163 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-57163 affect?

CVE-2026-57163 affects pjsip. Severity is critical (CVSS 9.1). 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_

Q: How urgent is CVE-2026-57163?

Priority 45/100. Critical severity; Remotely exploitable, no login, no user action

This month

CRITICAL 9.1REMOTEUPGRADE

CVE-2026-57163 is a critical-severity flaw (CVSS 9.1) affecting pjsip. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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

Why this priority

Critical severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.1 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.4% (top 66%)
CISA exploited list	No
Weakness	CWE-121
Published	2026-09-04
Last modified	2026-09-11

Publisher (CNA): GitHub, Inc. · Vendor: teluu

Last updated 2026-09-11 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-09-04 18:17 UTCPublished CVE record published
2026-09-11 15:51 UTCUpdated Record last modified

teluu pjsip UPGRADE

Affected: <= 2.17

Fixed in: newer than 2.17

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy pjsip || rpm -q pjsip || pjsip --version

2. UPGRADE to newer than 2.17 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade pjsip

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade pjsip

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-57163?

pjsip: upgrade to newer than 2.17. Exact commands for each OS are on this page.

Is CVE-2026-57163 being exploited?

CVE-2026-57163 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-57163 affect?

CVE-2026-57163 affects pjsip. Severity is critical (CVSS 9.1). 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_

How urgent is CVE-2026-57163?

Priority 45/100. Critical severity; Remotely exploitable, no login, no user action

Software pages

OpenSSL vulnerabilities · GnuTLS vulnerabilities

Related CVEs

CVE-2026-40892 CRITICAL 9.8 UPGRADE PJSIP is a free and open source multimedia communication library written in C
CVE-2026-41415 CRITICAL 9.1 UPGRADE PJSIP is a free and open source multimedia communication library written in C
CVE-2026-40614 HIGH 8.8 UPGRADE PJSIP is a free and open source multimedia communication library written in C
CVE-2026-42225 MEDIUM 5.9 UPGRADE PJSIP is a free and open source multimedia communication library written in C
CVE-2026-41416 HIGH 7.5 UPGRADE PJSIP is a free and open source multimedia communication library written in C

References

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