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

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-44631
StatePUBLISHED
Assignerapache
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-08 16:16:40 UTC
Updated2026-07-23 07:10:00 UTC
DescriptionBuffer 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.

Risk And Classification

Primary CVSS: v3.1 9.8 CRITICAL from ADP

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

EPSS: 0.005050000 probability, percentile 0.390500000 (date 2026-06-17)

Problem Types: CWE-124 | CWE-124 CWE-124: Buffer Underwrite

VersionSourceTypeScoreSeverityVector
3.1ADPDECLARED9.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
3.1134c704f-9b21-4f2e-91b3-4a467353bcc0Secondary9.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

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

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Apache Http Server All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Apache Software Foundation Apache HTTP Server affected 2.4.0 2.4.67 semver Not specified

References

ReferenceSourceLinkTags
www.openwall.com/lists/oss-security/2026/06/08/14 af854a3a-2127-422b-91ae-364da2661108 www.openwall.com Mailing List, Third Party Advisory
httpd.apache.org/security/vulnerabilities_24.html [email protected] httpd.apache.org Vendor Advisory
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Zhenpeng (Leo) Lin at depthfirst (en)

CNA: Bartlomiej Dmitruk (en)

Additional Advisory Data

SourceTimeEvent
CNA2026-04-27T12:00:00.000Zreported
CNA2026-06-05T12:00:00.000Zfixed in 2.4.x by r1935015
CNA2026-06-08T12:00:00.000Z2.4.68 released

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