CVE-2026-18924: Haxx Curl

Critical severity, CVSS 9.1. EPSS: 0.6% chance of exploitation in the next 30 days.

A flaw in libcurl's handling of HTTP/2 Server Push streams, when the parent handle is set to share connections with other handles, can lead to use-after-free in the cleanup process.

Affected products

• Haxx Curl: from 7.44.0, before 8.22.0 (fixed in 8.22.0)

Published 2026-09-06. Last modified 2026-09-15.