CVE-2025-13034
Medium
Description
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.
SeverityMedium
CVSS5.9
Exploit probability—
ProductHaxx Curl
PublishedJan 8, 2026
First seenJan 8, 2026
Weakness typeCWE-295CWE-295
How to fix
Update
- haxx curl8.18.0 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| haxx curl | 8.8.0 ≤ v < 8.18.0 | 8.18.0 |
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