CVE-2026-56154

Public on 2026-10-01

Modified on 2026-10-03

Description

Use After Free vulnerability in Apache HTTP Server's mod_rewrite when using lookahead (%{LA-U:HTTP:...})

This issue affects Apache HTTP Server: from 2.4.0 through 2.4.68.

Severity

Medium

See what this means

CVSS v3 Base Score

4.8

See breakdown

Affected Packages

Platform	Package	Status
Amazon Linux 2 - Core	httpd	Pending Fix
Amazon Linux 2023	httpd	Pending Fix
Amazon Linux 2027 Preview	httpd	Pending Fix

CVSS Scores

	Score Type	Score	Vector
Amazon Linux	CVSSv3	4.8	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:L

References

FAQs regarding Amazon Linux ALAS/CVE Severity Red Hat: CVE-2026-56154 Mitre: CVE-2026-56154