What is CVE-2026-44631?

CVE-2026-44631 is a critical-severity vulnerability in Apache Http_server, classified under Buffer Underwrite. CVSS score: 9.8/10. Published 2026-06-08.

How severe is CVE-2026-44631?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Vulnerability in Apache Http_server

CVE-2026-44631

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…

EPSS: 0.005 (39.0th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Apache Http_server
Apache Software Foundation Http Server — versions 2.4.0

Weakness classification (CWE)

CWE-124 — Buffer Underwrite

References

security@apache.org (vendor-advisory, Vendor Advisory)
af854a3a-2127-422b-91ae-364da2661108 (Mailing List, Third Party Advisory)

Frequently asked questions

What is CVE-2026-44631?: CVE-2026-44631 is a critical-severity vulnerability in Apache Http_server, classified under Buffer Underwrite. CVSS score: 9.8/10. Published 2026-06-08.
How severe is CVE-2026-44631?: Critical severity. CVSS v3 base score is 9.8 out of 10.