CVE-2026-44631

CRITICAL 9.8

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

CVSS Score

9.8

EPSS Score

0.0%

EPSS Percentile

0th

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	CWE-124
Vendor	apache software foundation
Product	apache http server
Published	Jun 8, 2026
Last Updated	Jun 8, 2026

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Affected Versions

Apache Software Foundation / Apache HTTP Server

2.4.0 ≤ 2.4.67

References

NVD ↗ CVE.org ↗ EPSS Data ↗

httpd.apache.org: https://httpd.apache.org/security/vulnerabilities_24.html openwall.com: http://www.openwall.com/lists/oss-security/2026/06/08/14

Credits

Zhenpeng (Leo) Lin at depthfirst Bartlomiej Dmitruk