CVE-2025-4947: Haxx Curl

Medium severity, CVSS 6.5. EPSS: 0.3% chance of exploitation in the next 30 days.

libcurl accidentally skips the certificate verification for QUIC connections when connecting to a host specified as an IP address in the URL. Therefore, it does not detect impostors or man-in-the-middle attacks.

Affected products

• Haxx Curl: from 8.8.0, before 8.14.0 (fixed in 8.14.0)

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