CVE-2026-8925: Haxx Curl

Critical severity, CVSS 9.8. EPSS: 1.1% chance of exploitation in the next 30 days.

The curl logic that works with SASL authentication could end up cleaning up the GSASL context *twice* without clearing the pointer in between, making it `free()` the same pointer twice.

Affected products

• Haxx Curl: from 8.15.0, before 8.21.0 (fixed in 8.21.0)

Published 2026-07-03. Last modified 2026-09-15.