Cyber Resilience

CVE-2026-44631

CriticalUpdated

Published: 08 June 2026

Published
08 June 2026
Modified
17 June 2026
KEV Added
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Patch
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CVSS Score v3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS Score 0.0049 38.3th percentile
Risk Priority 70 floored blend · peak EPSS

Summary

CVE-2026-44631 is a critical-severity Buffer Underflow (CWE-124) vulnerability in Apache Http Server. Its CVSS base score is 9.8 (Critical).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 38.3th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

EU & UK References

Vulnerability details

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(s)
CWE-124

Related Threats

MITRE ATT&CK Enterprise TechniquesAI

T1190 Exploit Public-Facing Application Initial Access
Adversaries may attempt to exploit a weakness in an Internet-facing host or system to initially access a network.
attack.mitre.org →
Why these techniques?

Buffer underwrite in Apache HTTP Server config regex handling enables remote exploitation of a public-facing web server (critical CVSS, memory corruption to RCE).

Confidence: HIGH · MITRE ATT&CK Enterprise v19.0

Affected Assets

apache
http server
2.4.0 — 2.4.68

Mitigating Controls

No mitigating controls mapped yet. The per-CVE control annotator has not reached this CVE.

References