CVE-2025-5025: Haxx Curl

Medium severity, CVSS 4.8. EPSS: 0.3% chance of exploitation in the next 30 days.

libcurl supports *pinning* of the server certificate public key for HTTPS transfers. Due to an omission, this check is not performed when connecting with QUIC for HTTP/3, when the TLS backend is wolfSSL. Documentation says the option works with wolfSSL, failing to specify that it does not for QUIC and HTTP/3. Since pinning makes the transfer succeed if the pin is fine, users could unwittingly connect to an impostor server without noticing.

Affected products

• Haxx Curl: from 8.5.0, before 8.14.0 (fixed in 8.14.0)

Published 2025-05-28. Last modified 2026-06-17.