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.

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Fixes

Solution

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Workaround

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History

Mon, 04 May 2026 18:30:00 +0000

Type Values Removed Values Added
References

Mon, 04 May 2026 17:15:00 +0000

Type Values Removed Values Added
First Time appeared Apache
Apache http Server
Vendors & Products Apache
Apache http Server

Mon, 04 May 2026 16:15:00 +0000

Type Values Removed Values Added
Metrics cvssV3_1

{'score': 6.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N'}

ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Mon, 04 May 2026 15:00:00 +0000

Type Values Removed Values Added
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.
Title Apache HTTP Server: multiple modules: HTTP response splitting forwarding malicious status line
Weaknesses CWE-443
References

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: apache

Published:

Updated: 2026-05-04T17:32:49.282Z

Reserved: 2026-03-20T17:29:39.696Z

Link: CVE-2026-33523

cve-icon Vulnrichment

Updated: 2026-05-04T17:32:49.282Z

cve-icon NVD

Status : Undergoing Analysis

Published: 2026-05-04T15:16:04.227

Modified: 2026-05-04T18:16:27.673

Link: CVE-2026-33523

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-05-04T17:30:04Z

Weaknesses