CVE-2026-34501: Apache Apr-Util

High severity, CVSS 7.5. EPSS: 0.5% chance of exploitation in the next 30 days.

Heap-based Buffer Overflow vulnerability in Apache Portable Runtime Utility redis client. This issue affects Apache Portable Runtime Utility: from 1.6.0 through 1.6.3. Users are recommended to upgrade to version 1.6.4, which fixes the issue.

Affected products

• Apache Apr-Util: from 1.6.0, before 1.6.4 (fixed in 1.6.4)

Published 2026-08-06. Last modified 2026-08-07.