Vulnerability Report

CVE-2025-13034

Title: Pinned Public Key Check Bypass in curl with QUIC and GnuTLS

Other

Proof Of Concept

No public PoC currently indexed for CVE-2025-13034.

CWE Category NVD-CWE-noinfo

Published Date Jan 08, 2026

Modified Date Jan 20, 2026

Exploit Status Not Found

Score 5.9 CVSS v

Exploit Probability (EPSS)

0.23%

Vulnerability Summary

CVE-2025-13034: 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 verification.

Impacted Vendors

daniel_stenberg 1

haxx 1

Reference Links

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

CVSS v3.1

Source Entity 134c704f-9b21-4f2e-91b3-4a467353bcc0

Severity MEDIUM

5.9

Attack Vector

NETWORK

Complexity

HIGH

Privileges

N/A

Interaction

NONE

Confidentiality

N/A

Integrity

N/A

Availability

N/A

Scope

UNCHANGED

RAW VECTOR CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N

Associated Attack Patterns (CAPEC)

Total: Patterns