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CVE-2026-44631

41
FAUCET Score

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.

First published: Jun 8, 2026Last modified: Jun 8, 2026

Impacted Technologies

VendorProductVersion(s)CPE
>= 2.4.0, < 2.4.68CPE matchmatch criteria
cpe:2.3:a:apache:http_server:*:*:*:*:*:*:*:*
>= 2.4.0, <= 2.4.67CPE match
cpe:2.3:a:apache:http_server:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

9.8CRITICAL

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.50%
Probability of exploitation in next 30 days
EPSS Percentile
40.2%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0050 is in the 19th percentile among its peer group of 36,862 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (9)

apachepatch availablevia llm_extracted
Fixed in: 2.4
ubuntupatch availablevia ubuntu_usn
Product: apache2 (focal)Fixed in: 2.4.41-4ubuntu3.23+esm5
ubuntupatch availablevia ubuntu_usn
Product: apache2 (trusty)Fixed in: 2.4.7-1ubuntu4.22+esm14
ubuntupatch availablevia ubuntu_usn
Product: apache2 (xenial)Fixed in: 2.4.18-2ubuntu3.17+esm19
ubuntupatch availablevia ubuntu_usn
Product: apache2 (bionic)Fixed in: 2.4.29-1ubuntu4.27+esm10
ubuntupatch availablevia ubuntu_usn
Product: apache2 (resolute)Fixed in: 2.4.66-2ubuntu2.4
ubuntupatch availablevia ubuntu_usn
Product: apache2 (jammy)Fixed in: 2.4.52-1ubuntu4.23
ubuntupatch availablevia ubuntu_usn
Product: apache2 (noble)Fixed in: 2.4.58-1ubuntu8.15
apachevendor investigatingvia vendor_rss
View patch

Vendor Advisories (5)

ubuntuUSN-8571-1

Apache HTTP Server vulnerabilities

Jul 20, 2026
ubuntuUSN-8516-1

Apache HTTP Server vulnerabilities

Jul 8, 2026
microsoft2026-Jun/CVE-2026-44631Important

Apache HTTP Server: Heap Underflow in `ap_regname` via Signed Char Overflow

Jun 9, 2026
apacheapache:www.mail-archive.com/[email protected]/msg11217.htmlLOW

CVE-2026-44631: Apache HTTP Server: Heap Underflow in `ap_regname` via Signed Char Overflow

Jun 8, 2026
apachellm-apache-f398f8ed28802aa3LOW

Apache HTTP Server 2.4 vulnerabilities - The Apache HTTP Server Project

Mar 2, 2026

References

openwall.com / lists/oss-security/2026/06/08/14
Mailing ListThird Party Advisory
httpd.apache.org / security/vulnerabilities_24.html
Vendor Advisory