CVE-2026-33523

Published May 4, 2026

Last updated 4 days ago

Overview

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.
Source
security@apache.org
NVD status
Analyzed
Products
http_server

Risk scores

CVSS 3.1

Type
Secondary
Base score
6.5
Impact score
2.5
Exploitability score
3.9
Vector string
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Severity
MEDIUM

Weaknesses

security@apache.org
CWE-443
nvd@nist.gov
NVD-CWE-Other

Social media

Hype score
Not currently trending

Configurations