Protection Mechanism Failure in cURL - CVE-2025-13034

Vulnerability details

The vulnerability allows a remote attacker to bypass implemented security restrictions.

The vulnerability exists due to insufficient implementation of security measures. When using CURLOPT_PINNEDPUBLICKEY option with libcurl or --pinnedpubkey with the curl tool, curl should check the public key of the server certificate to verify the peer. This check was skipped in a certain condition that would then make curl allow the connection without performing the proper check, thus not noticing a possible impostor.

To skip this check, the connection had to be done with QUIC with ngtcp2 built to use GnuTLS and the user had to explicitly disable the standard certificate verifiation.

Affected software

How to mitigate CVE-2025-13034

External References

• https://curl.se/docs/CVE-2025-13034.html

Related Security Bulletins

• Multiple vulnerabilities in cURL
• Tenable Network Monitor update for third-party components
• Meinberg LANTIME firmware update for third-party components
• Multiple vulnerabilities in Tenable Security Center
• Ubuntu update for curl
• Ubuntu update for curl