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CVE-2026-44631

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

Published: Jun 8, 2026Updated: Jun 8, 2026 Sources: CVE List NVD

9.8CVSS

CRITICAL

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.

EPSS Score

N/A

CISA KEV

Not in KEV

Exploits

No Known Exploits

Remediation

No Fix Available

CVSS Vector Breakdown

Exploitability

AV:NAttack Vector

Network

AC:LAttack Complexity

Low

PR:NPrivileges Required

None

UI:NUser Interaction

None

Scope

S:UScope

Unchanged

Impact

C:HConfidentiality

High

I:HIntegrity

High

A:HAvailability

High

Weaknesses

CWE-124

Affected Products

Apache HTTP Server

Apache Software Foundation

Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.

References

https://httpd.apache.org/security/vulnerabilities_24.html

httpd.apache.org

http://www.openwall.com/lists/oss-security/2026/06/08/14

openwall.com

Timeline

Published

Jun 8, 2026

Last Updated

Jun 8, 2026

News mentions

Emergency Patch Release Secures Apache HTTP Server Deployments Against Remote Attacks
en-us·Daily CyberSecurity (securityonline.info)· Summary only·Jun 9, 2026

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