Use After Free Vulnerability in Apache HTTP Server's mod_rewrite
CVE-2026-56154

9.8CRITICAL

Key Information:

Vendor

Apache
Status
Apache Http Server
Vendor
CVE Published:
1 October 2026

What is CVE-2026-56154?

A Use After Free vulnerability has been identified in the Apache HTTP Server's mod_rewrite module when processing lookahead directives. This flaw can lead to unexpected behavior when the server interprets certain configurations, potentially allowing attackers to manipulate server processes or execute unintended commands. Users of affected versions should review their configurations and apply recommended patches to mitigate risk.

Affected Version(s)

Apache HTTP Server 2.4.0 <= 2.4.68

References

https://httpd.apache.org/security/vulnerabilities_24.html
vendor-advisory

CVSS V3.1

Score:
9.8
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Nebula Security (@nebusecurity)
.