CVE-2026-33523

Severity CVSS v4.0:

Pending analysis

Type:

Unavailable / Other

Publication date:

04/05/2026

Last modified:

04/05/2026

Description

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

Impact

Vector 3.x

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N CVSS v3.1 Severity and Metrics:

Base Score: 6.50 MEDIUM
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): None
Scope (S): Unchanged
Confidentiality (C): Low
Integrity (I): Low
Availability (A): None