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 severity
Medium
See what this means
CVSS v3 Base Score
4.8
See breakdown

Affected Packages

Platform Package Release Date Advisory Status
Amazon Linux 2 - Core httpd 2026-10-12 ALAS2-2026-3990 Fixed
Amazon Linux 2023 httpd 2026-10-12 ALAS2023-2026-3202 Fixed
Amazon Linux 2027 Preview httpd 2026-10-12 ALAS2027-2026-207 Fixed

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