CVE-2026-42225 GnuTLS backend silently skips certificate chain verification when verify_peer is false
Attackers can bypass TLS certificate verification in PJSIP GnuTLS builds, allowing man-in-the-middle attacks against SIP connections.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-42225?
CVE-2026-42225 is a high-severity vulnerability in pjsip pjproject, published on 7 May 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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.
Weakness: CWE-295
Which versions are affected by CVE-2026-42225?
It affects 1 product.
Products include Teluu Pjsip.
How do I fix CVE-2026-42225?
Upgrade to a fixed version.
Is CVE-2026-42225 being exploited?
There is no known exploitation of CVE-2026-42225 in the wild and no public exploit code.
Other vulnerabilities in pjsip pjproject
- CVE-2023-38703 PJSIP has use-after-free vulnerability in SRTP media transport
- CVE-2022-39269 Media transport downgrade from the secure version (SRTP) to non-secure (RTP) in pjsip
- CVE-2026-57161 PJSIP: Stack overflow handling Service-Route headers in a registration response
- CVE-2026-57162 PJSIP: Stack overflow parsing SDP a=crypto attributes
- CVE-2026-57163 PJSIP: Stack overflow parsing a TLS peer certificate's SubjectAltName in GnuTLS backend
Sources
Also known as DEBIAN-CVE-2026-42225, GHSA-x2fv-6j6c-pxmx, UBUNTU-CVE-2026-42225.