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CVE Vulnerability Details :
CVE-2026-33523
PUBLISHED
More InfoOfficial Page
Assigner-apache
Assigner Org ID-f0158376-9dc2-43b6-827c-5f631a4d8d09
View Known Exploited Vulnerability (KEV) details
Published At-04 May, 2026 | 14:40
Updated At-04 May, 2026 | 17:32
Rejected At-
▼CVE Numbering Authority (CNA)
Apache HTTP Server: multiple modules: HTTP response splitting forwarding malicious status line

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 Products
Vendor
The Apache Software FoundationApache Software Foundation
Product
Apache HTTP Server
Default Status
unaffected
Versions
Affected
  • From 2.4.0 through 2.4.66 (semver)
Problem Types
TypeCWE IDDescription
CWECWE-443CWE-443: HTTP response splitting
Type: CWE
CWE ID: CWE-443
Description: CWE-443: HTTP response splitting
Metrics
VersionBase scoreBase severityVector
Metrics Other Info
Textual description of severity
text:
low
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
finder
Haruki Oyama (Waseda University)
finder
Merih Mengisteab
finder
Dawit Jeong
Timeline
EventDate
reported2026-03-05 12:00:00
2.4.67 released2026-05-04 12:00:00
fixed in 2.4.x by r19333602026-05-04 12:00:00
Event: reported
Date: 2026-03-05 12:00:00
Event: 2.4.67 released
Date: 2026-05-04 12:00:00
Event: fixed in 2.4.x by r1933360
Date: 2026-05-04 12:00:00
Replaced By
Rejected Reason
References
HyperlinkResource
https://httpd.apache.org/security/vulnerabilities_24.html
vendor-advisory
Hyperlink: https://httpd.apache.org/security/vulnerabilities_24.html
Resource:
vendor-advisory
▼Authorized Data Publishers (ADP)
1. CISA ADP Vulnrichment
Affected Products
Metrics
VersionBase scoreBase severityVector
3.16.5MEDIUM
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
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
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
2. CVE Program Container
Affected Products
Metrics
VersionBase scoreBase severityVector
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
http://www.openwall.com/lists/oss-security/2026/05/04/23
N/A
Hyperlink: http://www.openwall.com/lists/oss-security/2026/05/04/23
Resource: N/A
Details not found