CVE-2026-33857: Apache HTTP Server

Medium severity, CVSS 5.3. EPSS: 0.9% chance of exploitation in the next 30 days.

Out-of-bounds Read vulnerability in mod_proxy_ajp of Apache HTTP Server. This issue affects Apache HTTP Server: through 2.4.66. Users are recommended to upgrade to version 2.4.67, which fixes the issue.

Affected products

• Apache HTTP Server: before 2.4.67 (fixed in 2.4.67)

Published 2026-05-04. Last modified 2026-06-17.