CVE-2026-33523

MEDIUM 6.5

Apache HTTP Server: multiple modules: HTTP response splitting forwarding malicious status line

CVSS Score

6.5

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-443
Vendor	apache software foundation
Product	apache http server
Published	May 4, 2026
Last Updated	May 4, 2026

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Affected Versions

Apache Software Foundation / Apache HTTP Server

2.4.0 ≤ 2.4.66

References

NVD ↗ CVE.org ↗ EPSS Data ↗

httpd.apache.org: https://httpd.apache.org/security/vulnerabilities_24.html openwall.com: http://www.openwall.com/lists/oss-security/2026/05/04/23

Credits

Haruki Oyama (Waseda University) Merih Mengisteab Dawit Jeong