CVE-2026-84975: PJSIP is a free and open source multimedia communication library written in C

Q: How do I fix CVE-2026-84975?

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

Q: Is CVE-2026-84975 being exploited?

CVE-2026-84975 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-2026-84975 affect?

CVE-2026-84975 affects pjsip. Severity is high (CVSS 7.4). PJSIP is a free and open source multimedia communication library written in C. In 2.17 and earlier, the OpenSSL and GnuTLS backends in pjlib/src/pj/ssl_sock_ossl.c and pjlib/src/pj/ssl_sock_gtls.c copy DNS SubjectAltName values with string

Q: How urgent is CVE-2026-84975?

Priority 34/100. High severity; Remotely exploitable, no login, no user action

Routine

HIGH 7.4REMOTEUPGRADE

CVE-2026-84975 is a high-severity flaw (CVSS 7.4) 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. In 2.17 and earlier, the OpenSSL and GnuTLS backends in pjlib/src/pj/ssl_sock_ossl.c and pjlib/src/pj/ssl_sock_gtls.c copy DNS SubjectAltName values with string functions that recalculate their length and truncate an embedded NUL byte. With server verification enabled through --tls-verify-server for the PJSIP TLS/SIPS transport, a certificate containing a DNS SubjectAl

Why this priority

High severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.4 (High)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	None
EPSS exploit chance	0.2% (top 86%)
CISA exploited list	No
Weakness	CWE-295, CWE-297
Published	2026-09-18
Last modified	2026-10-20

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

Last updated 2026-10-20 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-09-18 18:17 UTCPublished CVE record published
2026-10-20 19:52 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-2026-84975?

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

Is CVE-2026-84975 being exploited?

CVE-2026-84975 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-2026-84975 affect?

CVE-2026-84975 affects pjsip. Severity is high (CVSS 7.4). PJSIP is a free and open source multimedia communication library written in C. In 2.17 and earlier, the OpenSSL and GnuTLS backends in pjlib/src/pj/ssl_sock_ossl.c and pjlib/src/pj/ssl_sock_gtls.c copy DNS SubjectAltName values with string

How urgent is CVE-2026-84975?

Priority 34/100. High 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
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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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