CVE-2026-44631CWE-124

Apache HTTP Server: Heap Underflow in `ap_regname` via Signed Char Overflow

Critical · published June 8, 2026

CVSS v3.1
9.8
EPSS
1%
Percentile
54.3
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
9.8 · CRITICAL
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.00746 · 54.3th percentile
Weakness
CWE-124 · Buffer Underwrite ('Buffer Underflow')
Published
2026-06-08T15:19Z
EPSS history
Timeline
  • 08 JUN 15:19Z
    Apache HTTP Server: Heap Underflow in `ap_regname` via Signed Char Overflow
    cvelistv5