CVE-2026-6429: Haxx Curl

Medium severity, CVSS 5.3. EPSS: 0.5% chance of exploitation in the next 30 days.

When asked to both use a `.netrc` file for credentials and to follow HTTP redirects, libcurl could leak the password used for the first host to the followed-to host under certain circumstances.

Affected products

• Haxx Curl: from 7.14.0, before 8.20.0 (fixed in 8.20.0)

Published 2026-05-13. Last modified 2026-09-15.