Is CVE-2026-44631 in the CISA KEV catalog?

No. CVE-2026-44631 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2026-44631?

CVE-2026-44631 has a CVSS v3 base score of 9.4 (Important).

What is the EPSS score for CVE-2026-44631?

CVE-2026-44631 has an EPSS score of 0.49% (39th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2026-44631?

Upgrade apache2 on debian 11 to 2.4.67-1~deb11u3 or later. Fixes are available for 59 affected products.

CVE & CISA-KEV Catalog

CVE-2026-44631

HIGH

9.4

CVSS v3

NVD

Description

Buffer Underwrite vulnerability in Apache HTTP Server on crafted regular expressions in the configuration. This issue affects Apache HTTP Server: from 2.4.0 through 2.4.67. Users are recommended to upgrade to version 2.4.68, which fixes the issue.

CWE-124

How to fix

Remediation Available

apache2Debian

Fixed in:2.4.67-1~deb11u3CVE-2026-44631

Fixed in:2.4.68-1~deb12u1CVE-2026-44631

Fixed in:2.4.68-1~deb13u1CVE-2026-44631

Fixed in:2.4.68-1CVE-2026-44631

httpdRocky

Fixed in:0:2.4.63-13.el10_2.4RHSA-2026:34109

Fixed in:0:2.4.62-13.el9_8.5RHSA-2026:41906

httpdRed Hat / RHEL

Fixed in:0:2.4.63-13.el10_2.4RHSA-2026:34109

Fixed in:0:2.4.62-13.el9_8.5RHSA-2026:41906

httpd-coreRocky

Fixed in:0:2.4.63-13.el10_2.4RHSA-2026:34109

Fixed in:0:2.4.62-13.el9_8.5RHSA-2026:41906

httpd-coreRed Hat / RHEL

Fixed in:0:2.4.63-13.el10_2.4RHSA-2026:34109

Fixed in:0:2.4.62-13.el9_8.5RHSA-2026:41906

httpd-core-debuginfoRocky

Fixed in:0:2.4.63-13.el10_2.4RHSA-2026:34109

Fixed in:0:2.4.62-13.el9_8.5RHSA-2026:41906

httpd-core-debuginfoRed Hat / RHEL

Fixed in:0:2.4.63-13.el10_2.4RHSA-2026:34109

Fixed in:0:2.4.62-13.el9_8.5RHSA-2026:41906

httpd-debuginfoRed Hat / RHEL

Fixed in:0:2.4.63-13.el10_2.4RHSA-2026:34109

Fixed in:0:2.4.62-13.el9_8.5RHSA-2026:41906

httpd-debuginfoRocky

Fixed in:0:2.4.63-13.el10_2.4RHSA-2026:34109

Fixed in:0:2.4.62-13.el9_8.5RHSA-2026:41906

httpd-debugsourceRed Hat / RHEL

Fixed in:0:2.4.63-13.el10_2.4RHSA-2026:34109

Fixed in:0:2.4.62-13.el9_8.5RHSA-2026:41906

httpd-debugsourceRocky

Fixed in:0:2.4.63-13.el10_2.4RHSA-2026:34109

Fixed in:0:2.4.62-13.el9_8.5RHSA-2026:41906

httpd-develRocky

Fixed in:0:2.4.63-13.el10_2.4RHSA-2026:34109

Fixed in:0:2.4.62-13.el9_8.5RHSA-2026:41906

httpd-develRed Hat / RHEL

Fixed in:0:2.4.63-13.el10_2.4RHSA-2026:34109

Fixed in:0:2.4.62-13.el9_8.5RHSA-2026:41906

httpd-filesystemRed Hat / RHEL

Fixed in:0:2.4.63-13.el10_2.4RHSA-2026:34109

Fixed in:0:2.4.62-13.el9_8.5RHSA-2026:41906

httpd-filesystemRocky

Fixed in:0:2.4.63-13.el10_2.4RHSA-2026:34109

Fixed in:0:2.4.62-13.el9_8.5RHSA-2026:41906

httpd-manualRocky

Fixed in:0:2.4.63-13.el10_2.4RHSA-2026:34109

Fixed in:0:2.4.62-13.el9_8.5RHSA-2026:41906

httpd-manualRed Hat / RHEL

Fixed in:0:2.4.63-13.el10_2.4RHSA-2026:34109

Fixed in:0:2.4.62-13.el9_8.5RHSA-2026:41906

httpd-toolsRocky

Fixed in:0:2.4.63-13.el10_2.4RHSA-2026:34109

Fixed in:0:2.4.62-13.el9_8.5RHSA-2026:41906

httpd-toolsRed Hat / RHEL

Fixed in:0:2.4.63-13.el10_2.4RHSA-2026:34109

Fixed in:0:2.4.62-13.el9_8.5RHSA-2026:41906

httpd-tools-debuginfoRocky

Fixed in:0:2.4.63-13.el10_2.4RHSA-2026:34109

Fixed in:0:2.4.62-13.el9_8.5RHSA-2026:41906

httpd-tools-debuginfoRed Hat / RHEL

Fixed in:0:2.4.63-13.el10_2.4RHSA-2026:34109

Fixed in:0:2.4.62-13.el9_8.5RHSA-2026:41906

mod_ldapRed Hat / RHEL

Fixed in:0:2.4.63-13.el10_2.4RHSA-2026:34109

Fixed in:0:2.4.62-13.el9_8.5RHSA-2026:41906

mod_ldapRocky

Fixed in:0:2.4.63-13.el10_2.4RHSA-2026:34109

Fixed in:0:2.4.62-13.el9_8.5RHSA-2026:41906

mod_ldap-debuginfoRed Hat / RHEL

Fixed in:0:2.4.63-13.el10_2.4RHSA-2026:34109

Fixed in:0:2.4.62-13.el9_8.5RHSA-2026:41906

mod_ldap-debuginfoRocky

Fixed in:0:2.4.63-13.el10_2.4RHSA-2026:34109

Fixed in:0:2.4.62-13.el9_8.5RHSA-2026:41906

mod_luaRocky

Fixed in:0:2.4.63-13.el10_2.4RHSA-2026:34109

Fixed in:0:2.4.62-13.el9_8.5RHSA-2026:41906

mod_luaRed Hat / RHEL

Fixed in:0:2.4.63-13.el10_2.4RHSA-2026:34109

Fixed in:0:2.4.62-13.el9_8.5RHSA-2026:41906

mod_lua-debuginfoRed Hat / RHEL

Fixed in:0:2.4.63-13.el10_2.4RHSA-2026:34109

Fixed in:0:2.4.62-13.el9_8.5RHSA-2026:41906

mod_lua-debuginfoRocky

Fixed in:0:2.4.63-13.el10_2.4RHSA-2026:34109

Fixed in:0:2.4.62-13.el9_8.5RHSA-2026:41906

mod_proxy_htmlRed Hat / RHEL

Fixed in:1:2.4.63-13.el10_2.4RHSA-2026:34109

Fixed in:1:2.4.62-13.el9_8.5RHSA-2026:41906

mod_proxy_htmlRocky

Fixed in:1:2.4.63-13.el10_2.4RHSA-2026:34109

Fixed in:1:2.4.62-13.el9_8.5RHSA-2026:41906

mod_proxy_html-debuginfoRed Hat / RHEL

Fixed in:1:2.4.63-13.el10_2.4RHSA-2026:34109

Fixed in:1:2.4.62-13.el9_8.5RHSA-2026:41906

mod_proxy_html-debuginfoRocky

Fixed in:1:2.4.63-13.el10_2.4RHSA-2026:34109

Fixed in:1:2.4.62-13.el9_8.5RHSA-2026:41906

mod_sessionRocky

Fixed in:0:2.4.63-13.el10_2.4RHSA-2026:34109

Fixed in:0:2.4.62-13.el9_8.5RHSA-2026:41906

mod_sessionRed Hat / RHEL

Fixed in:0:2.4.63-13.el10_2.4RHSA-2026:34109

Fixed in:0:2.4.62-13.el9_8.5RHSA-2026:41906

mod_session-debuginfoRocky

Fixed in:0:2.4.63-13.el10_2.4RHSA-2026:34109

Fixed in:0:2.4.62-13.el9_8.5RHSA-2026:41906

mod_session-debuginfoRed Hat / RHEL

Fixed in:0:2.4.63-13.el10_2.4RHSA-2026:34109

Fixed in:0:2.4.62-13.el9_8.5RHSA-2026:41906

mod_sslRed Hat / RHEL

Fixed in:1:2.4.63-13.el10_2.4RHSA-2026:34109

Fixed in:1:2.4.62-13.el9_8.5RHSA-2026:41906

mod_sslRocky

Fixed in:1:2.4.63-13.el10_2.4RHSA-2026:34109

Fixed in:1:2.4.62-13.el9_8.5RHSA-2026:41906

mod_ssl-debuginfoRed Hat / RHEL

Fixed in:1:2.4.63-13.el10_2.4RHSA-2026:34109

Fixed in:1:2.4.62-13.el9_8.5RHSA-2026:41906

mod_ssl-debuginfoRocky

Fixed in:1:2.4.63-13.el10_2.4RHSA-2026:34109

Fixed in:1:2.4.62-13.el9_8.5RHSA-2026:41906

apache2Ubuntu

Fixed in:2.4.7-1ubuntu4.22+esm14USN-8571-1

Fixed in:2.4.18-2ubuntu3.17+esm19USN-8571-1

Fixed in:2.4.29-1ubuntu4.27+esm10USN-8571-1

Fixed in:2.4.41-4ubuntu3.23+esm5USN-8571-1

Fixed in:2.4.52-1ubuntu4.23USN-8516-1

Fixed in:2.4.58-1ubuntu8.15USN-8516-1

apache2-binUbuntu

Fixed in:2.4.7-1ubuntu4.22+esm14USN-8571-1

Fixed in:2.4.18-2ubuntu3.17+esm19USN-8571-1

Fixed in:2.4.29-1ubuntu4.27+esm10USN-8571-1

Fixed in:2.4.41-4ubuntu3.23+esm5USN-8571-1

apache2-devUbuntu

Fixed in:2.4.7-1ubuntu4.22+esm14USN-8571-1

Fixed in:2.4.18-2ubuntu3.17+esm19USN-8571-1

Fixed in:2.4.29-1ubuntu4.27+esm10USN-8571-1

Fixed in:2.4.41-4ubuntu3.23+esm5USN-8571-1

apache2-mpm-eventUbuntu

Fixed in:2.4.7-1ubuntu4.22+esm14USN-8571-1

apache2-mpm-itkUbuntu

Fixed in:2.4.7-1ubuntu4.22+esm14USN-8571-1

apache2-mpm-preforkUbuntu

Fixed in:2.4.7-1ubuntu4.22+esm14USN-8571-1

apache2-mpm-workerUbuntu

Fixed in:2.4.7-1ubuntu4.22+esm14USN-8571-1

apache2-ssl-devUbuntu

Fixed in:2.4.29-1ubuntu4.27+esm10USN-8571-1

Fixed in:2.4.41-4ubuntu3.23+esm5USN-8571-1

apache2-suexecUbuntu

Fixed in:2.4.7-1ubuntu4.22+esm14USN-8571-1

apache2-suexec-customUbuntu

Fixed in:2.4.7-1ubuntu4.22+esm14USN-8571-1

Fixed in:2.4.18-2ubuntu3.17+esm19USN-8571-1

Fixed in:2.4.29-1ubuntu4.27+esm10USN-8571-1

Fixed in:2.4.41-4ubuntu3.23+esm5USN-8571-1

apache2-suexec-pristineUbuntu

Fixed in:2.4.7-1ubuntu4.22+esm14USN-8571-1

Fixed in:2.4.18-2ubuntu3.17+esm19USN-8571-1

Fixed in:2.4.29-1ubuntu4.27+esm10USN-8571-1

Fixed in:2.4.41-4ubuntu3.23+esm5USN-8571-1

apache2-utilsUbuntu

Fixed in:2.4.7-1ubuntu4.22+esm14USN-8571-1

Fixed in:2.4.18-2ubuntu3.17+esm19USN-8571-1

Fixed in:2.4.29-1ubuntu4.27+esm10USN-8571-1

Fixed in:2.4.41-4ubuntu3.23+esm5USN-8571-1

apache2.2-binUbuntu

Fixed in:2.4.7-1ubuntu4.22+esm14USN-8571-1

libapache2-mod-macroUbuntu

Fixed in:1:2.4.7-1ubuntu4.22+esm14USN-8571-1

libapache2-mod-mdUbuntu

Fixed in:2.4.41-4ubuntu3.23+esm5USN-8571-1

libapache2-mod-proxy-htmlUbuntu

Fixed in:1:2.4.7-1ubuntu4.22+esm14USN-8571-1

libapache2-mod-proxy-uwsgiUbuntu

Fixed in:2.4.41-4ubuntu3.23+esm5USN-8571-1

httpdWindows application

Affected:2.4.0 2.4.68Fixed in:2.4.68Apache Lounge

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityLow

IntegrityHigh

AvailabilityHigh

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:H/E:U

Exploit Intelligence

0.49%probability of exploitation in 30 days

39thpercentile

Low risk: more likely to be exploited than 39% of all known CVEs.

References

Vendor Advisory1

httpd.apache.org

Third-Party Advisory1

openwall.com

Related Vulnerabilities

Other CWE-124 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2015-2426	High	8.8	87%	KEV	-
CVE-2023-25610	Critical	9.8	18%	-	Fix
CVE-2018-5388	Medium	6.5	4.0%	-	Fix
CVE-2018-15361	Critical	9.8	2.9%	-	Fix
CVE-2021-36064	High	7.8	2.7%	-	Fix
CVE-2023-48230	Medium	5.9	1.9%	-	Fix

Embed a live status badge for CVE-2026-44631

Markdown

[![CVE-2026-44631](https://tridentstack.com/cve/badge/CVE-2026-44631.svg)](https://tridentstack.com/cve/CVE-2026-44631)

HTML

<a href="https://tridentstack.com/cve/CVE-2026-44631"><img src="https://tridentstack.com/cve/badge/CVE-2026-44631.svg" alt="CVE-2026-44631"></a>

Find and fix vulnerabilities across your fleet

TridentStack Control continuously scans your Windows, macOS, and Linux fleet for known vulnerabilities, prioritizes them by severity and active exploitation, and patches them automatically.

See how it works Start freeThis CVE lookup is free and always will be.

This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-06-11.