CVE-2026-33523

CVE-2026-33523: Apache HTTP Server: multiple modules: HTTP response splitting forwarding malicious status line

Vendor Apache Software Foundation

Product Apache HTTP Server

Weakness CWE-443

Published May 4, 2026

Last update May 4, 2026

View on NVD All CVEs

CVSS base score

—

What the vulnerability does

Description

HTTP response splitting vulnerability in multiple Apache HTTP Server modules with untrusted or compromised backend servers. This issue affects Apache HTTP Server: from through 2.4.66. Users are recommended to upgrade to version 2.4.67, which fixes the issue.

Key dates

Disclosure timeline

May 4, 2026 CVE published

May 4, 2026 Record updated