CVE-2025-49506: Apache Apr-Util

High severity, CVSS 7.5. EPSS: 0.4% chance of exploitation in the next 30 days.

APR-util versions 1.6.3 (and earlier) function apr_password_validate() was not constant-time with regards to hashes or passwords comparisons, potentially leaking their content via a side channel timing attack particularly on platforms without crypt() such as  Windows, BeOS, NetWare, or Android. Users are recommended to upgrade to version 1.6.4, which fixes this issue.

Affected products

• Apache Apr-Util: from 1.2.0, before 1.6.4 (fixed in 1.6.4)

Published 2026-08-06. Last modified 2026-09-29.