CVE-2026-34356: Apache HTTP Server

High severity, CVSS 7.5. EPSS: 1.2% chance of exploitation in the next 30 days.

Heap-based Buffer Overflow vulnerability in Apache HTTP Server with malicious backend servers and ProxyPassReverseCookie* This issue affects Apache HTTP Server: from 2.4.0 through 2.4.67. Users are recommended to upgrade to version 2.4.68, which fixes the issue.

Affected products

• Apache HTTP Server: from 2.4.0, before 2.4.68 (fixed in 2.4.68)

Published 2026-06-08. Last modified 2026-07-23.