Vulnerability DatabaseCVE-2026-33523
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CVE-2026-33523
Published:May 04, 2026
Updated:May 16, 2026
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.
Affected Packages
https://github.com/apache/httpd.git (GITHUB):
Affected version(s) >=2.4.1 <2.4.67
Fix Suggestion:
Update to version 2.4.67
Related Resources (2)
http://www.openwall.com/lists/oss-security/2026/05/04/23
https://httpd.apache.org/security/vulnerabilities_24.html
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CVSS v4
Base Score:
6.9
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
LOW
Vulnerable System Integrity
LOW
Vulnerable System Availability
NONE
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
6.5
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
LOW
Integrity
LOW
Availability
NONE
EPSS
Base Score:
0.17