CVE-2026-44186: Apache HTTP Server: Loop in `proxy_ftp_handler` in mod_proxy_ftp

[Eric Covener <covener () apache org>]

Severity: moderate 

Affected versions:

- Apache HTTP Server 2.4.0 through 2.4.67

Description:

Loop with Unreachable Exit Condition ('Infinite Loop') vulnerability in the mod_proxy_ftp module in Apache HTTP Server 
with an attacker controlled backend FTP server.

This issue affects undefined: from 2.4.0 through 2.4.67.

Users are recommended to upgrade to version 2.4.68, which fixes the issue.

Credit:

Zhenpeng (Leo) Lin at depthfirst (finder)

References:

https://httpd.apache.org/security/vulnerabilities_24.html
https://httpd.apache.org/
https://www.cve.org/CVERecord?id=CVE-2026-44186

Timeline:

2026-04-27: reported
2026-06-05: fixed in 2.4.x by r1935004
2026-06-08: 2.4.68 released