CVE-2026-7009: Haxx Curl

Medium severity, CVSS 5.3. EPSS: 0.3% chance of exploitation in the next 30 days.

When curl is told to use the Certificate Status Request TLS extension, often referred to as *OCSP stapling*, to verify that the server certificate is valid, it fails to detect OCSP problems and instead wrongly consider the response as fine.

Affected products

• Haxx Curl: from 8.17.0, before 8.20.0 (fixed in 8.20.0)

Published 2026-05-13. Last modified 2026-06-17.