CVE-2026-56154

criticalpriority · track · 0EPSS 0.005 · 45 %ileDEUS

grimoire priorityP2 · Scheduled

Exploitable?

—

no known exploitation

Likely / severe?

0.54% (45th) EPSS

CVSS 9.8 · critical

Is it mine?

10 products

Check your exposure

Who says so?

3 sources

cert_bund · nvd · osv

EPSS · scored 2026-10-27

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.

cvss

Technical severity, 0–10. One row per scoring source.

9.8

010

base score 0–10 · higher = more severe · hover a vector to decode

v3.19.8criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Hsecondaryexploitability 3.9 · impact 5.9

v3.19criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:Usecondary · CVSS-BT (t0sche)

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Exploitation: none · Automatable: yes · Technical Impact: totalcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-416US

affected products (10)

Products and version ranges known to be affected.

Amazon Linux 2all versionscert_bundDEcpe:/o:amazon:linux_2:-
Debian Linuxall versionscert_bundDEcpe:/o:debian:debian_linux:-
IBM HTTP Serverall versionscert_bundDEcpe:/a:ibm:http_server:-
Oracle Linuxall versionscert_bundDEcpe:/o:oracle:linux:-
RESF Rocky Linuxall versionscert_bundDEcpe:/o:resf:rocky_linux:-
Red Hat Enterprise Linuxall versionscert_bundDEcpe:/o:redhat:enterprise_linux:-
Ubuntu Linuxall versionscert_bundDEcpe:/o:canonical:ubuntu_linux:-
Apache HTTP Server< 2.4.69cert_bundDE
apache http server2.4.0 → 2.4.69nvdUScpe:2.3:a:apache:http_server:*:*:*:*:*:*:*:*
Bitnami apache2.4.0 → 2.4.69osvUSpkg:bitnami/apache

advisories (2)

Vendor and ecosystem advisories describing this.

WID-SEC-W-2026-3703Apache HTTP Server: Mehrere SchwachstellenDeutsch2026-10-01csaf · cert_bundDE
Ein Angreifer kann mehrere Schwachstellen in Apache HTTP Server ausnutzen, um beliebigen Programmcode auszuführen, die Authentifizierung zu umgehen, vertrauliche Informationen offenzulegen, Daten zu manipulieren oder Denial-of-Service-Zustände zu verursachen.
BIT-apache-2026-56154Apache HTTP Server: mod_rewrite use-after-free via %{LA-U:HTTP:...}2026-10-06vendor · osvUS
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.

sources

Which sources assert this record, and when.

cert_bund nvd osv NVD CVE.org MITRE

published 2026-10-01modified 2026-10-05

references (2) nvd

External citations — patches, advisories, analysis.

http://www.openwall.com/lists/oss-security/2026/10/01/17Mailing ListThird Party Advisory
https://httpd.apache.org/security/vulnerabilities_24.htmlVendor Advisory

scry

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