Apache HTTP Server: Heap Underflow in `ap_regname` via Signed Char Overflow
Summary
| CVE | CVE-2026-44631 |
|---|---|
| State | PUBLISHED |
| Assigner | apache |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-06-08 16:16:40 UTC |
| Updated | 2026-06-08 16:16:40 UTC |
| 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. |
Risk And Classification
Problem Types: CWE-124 | CWE-124 CWE-124: Buffer Underwrite
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Apache Software Foundation | Apache HTTP Server | affected 2.4.0 2.4.67 semver | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| httpd.apache.org/security/vulnerabilities_24.html | [email protected] | httpd.apache.org | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
Vendor Comments And Credit
Discovery Credit
CNA: Zhenpeng (Leo) Lin at depthfirst (en)
CNA: Bartlomiej Dmitruk (en)
Additional Advisory Data
| Source | Time | Event |
|---|---|---|
| CNA | 2026-04-27T12:00:00.000Z | reported |
| CNA | 2026-06-05T12:00:00.000Z | fixed in 2.4.x by r1935015 |
| CNA | 2026-06-08T12:00:00.000Z | 2.4.68 released |
There are currently no legacy QID mappings associated with this CVE.