CVE-2026-44631
Apache HTTP Server: Heap Underflow in `ap_regname` via Signed Char Overflow
9.8
CRITICAL
CVSS 3.1
Description
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.
How to fix CVE-2026-44631
To remediate CVE-2026-44631, upgrade the affected package to a fixed version below.
- Bitnami/apache—upgrade to 2.4.68 or later
- Debian/apache2—no fix listed
Is CVE-2026-44631 being exploited?
No exploitation signal available. Neither CISA KEV nor a current EPSS score has been published for CVE-2026-44631.
Affected packages (2)
- >= 2.4.0, < 2.4.68
- from 0
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| nvd | CVSS 3.1 | CRITICAL9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| osv | CVSS 3.1 | CRITICAL9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |