What is CVE-2026-42225?

CVE-2026-42225 is a medium-severity vulnerability in Pjsip Pjproject, classified under Improper Certificate Validation. CVSS score: 5.9/10. Published 2026-05-07.

How severe is CVE-2026-42225?

Medium severity. CVSS v3 base score is 5.9 out of 10.

Vulnerability in Pjsip Pjproject

CVE-2026-42225

PJSIP is a free and open source multimedia communication library written in C. Prior to version 2.17, on GnuTLS builds, the SIP TLS transport (sip_transport_tls) can accept connections with invalid or untrusted certificates even when the application explicitly enables certificate verification via verify_server = PJ_TRUE or verify_client = PJ_TRUE. This issue has been patched in version 2.17.

Vulnerability class: Improper Certificate Validation

Published 2026-05-07 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N.

EPSS exploit prediction

EPSS: 0.003 (17.0th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 17th percentile — 17.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.002 · newest: 0.003 · change: +0.001

Affected products

Pjsip Pjproject — versions < 2.17
Teluu Pjsip

Weakness classification (CWE)

CWE-295 — Improper Certificate Validation

References

github.com/pjsip/pjproject/security/advisories/GHSA-x2fv-6j6c-pxmx (Patch, Vendor Advisory)
github.com/pjsip/pjproject/commit/ef684252bb62b0716675b6e99ad7fe4c90e28920 (Patch)
github.com/pjsip/pjproject/releases/tag/2.17 (Product, Release Notes)

Frequently asked questions

What is CVE-2026-42225?: CVE-2026-42225 is a medium-severity vulnerability in Pjsip Pjproject, classified under Improper Certificate Validation. CVSS score: 5.9/10. Published 2026-05-07.
How severe is CVE-2026-42225?: Medium severity. CVSS v3 base score is 5.9 out of 10.