PatchSiren cyber security CVE debrief

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: 2026-07-23
Advisory published: 2026-06-08
Advisory updated: 2026-07-23

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.

Sources and references

Verified primary and authoritative sources

CVE-2026-44631 CVE Program record
Publisher, destination, and source semantics verified

URL: https://www.cve.org/CVERecord?id=CVE-2026-44631

CVE Program - Official CVE Program record with source-provided CVE metadata.
CVE-2026-44631 NVD vulnerability detail
Publisher, destination, and source semantics verified

URL: https://nvd.nist.gov/vuln/detail/CVE-2026-44631

NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Mitigation or vendor reference
Unverified legacy reference

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

[email protected] - Vendor Advisory

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.