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NVD Vulnerability Details :

CVE-2026-33523

Analyzed

Source-security@apache.org

Published At-04 May, 2026 | 15:16

Updated At-04 May, 2026 | 20:21

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.

Date Added	Due Date	Vulnerability Name	Required Action
	N/A

Metrics

Type	Version	Base score	Base severity	Vector
Secondary	3.1	6.5	MEDIUM	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

Type: Secondary

Version: 3.1

Base score: 6.5

Base severity: MEDIUM

Vector:

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

CPE Matches

The Apache Software Foundation

>>http_server>>Versions from 2.4.0(inclusive) to 2.4.67(exclusive)

cpe:2.3:a:apache:http_server:*:*:*:*:*:*:*:*

Weaknesses

CWE ID	Type	Source
CWE-443	Secondary	security@apache.org
NVD-CWE-Other	Primary	nvd@nist.gov

CWE ID: CWE-443

Type: Secondary

Source: security@apache.org

CWE ID: NVD-CWE-Other

Type: Primary

Source: nvd@nist.gov

References

Hyperlink	Source	Resource
https://httpd.apache.org/security/vulnerabilities_24.html	security@apache.org	Vendor Advisory
http://www.openwall.com/lists/oss-security/2026/05/04/23	af854a3a-2127-422b-91ae-364da2661108	Mailing List Third Party Advisory

Hyperlink: https://httpd.apache.org/security/vulnerabilities_24.html

Source: security@apache.org

Resource:

Vendor Advisory

Hyperlink: http://www.openwall.com/lists/oss-security/2026/05/04/23

Source: af854a3a-2127-422b-91ae-364da2661108

Resource:

Mailing List

Third Party Advisory

CISA Catalog

Metrics

CPE Matches

Weaknesses

Evaluator Description

Evaluator Impact

Evaluator Solution

Vendor Statements

References

Change History