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CVE-2026-44631 Apache CVE debrief

A 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.

Vendor
Apache
Product
HTTP Server
CVSS
CRITICAL 9.8
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-08
Original CVE updated
2026-06-11
Advisory published
2026-06-08
Advisory updated
2026-06-11

Who should care

Users of Apache HTTP Server versions from 2.4.0 through 2.4.67

Technical summary

The vulnerability is a Buffer Underwrite issue in Apache HTTP Server, which can be triggered by crafted regular expressions in the configuration. The Common Vulnerabilities and Exposures (CVE) score for this issue is 9.8, indicating a Critical severity level.

Defensive priority

high

Recommended defensive actions

  • Upgrade to Apache HTTP Server version 2.4.68 or later

Evidence notes

The vulnerability affects Apache HTTP Server versions from 2.4.0 through 2.4.67.

Official resources

CVE-2026-44631 was published on [2026-06-08T16:16:40.583Z](https://www.cve.org/CVERecord?id=CVE-2026-44631) and modified on [2026-06-11T04:01:49.173Z](https://nvd.nist.gov/vuln/detail/CVE-2026-44631).