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

What is CVE-2026-44186?

CVE-2026-44186 is a high-severity denial of service vulnerability in Apache Http Server, published on 8 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official 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.

Weakness: CWE-835

Which versions are affected by CVE-2026-44186?

1 open source package ship an affected version, including apache. It affects 1 product.

Products include Apache Http Server.

How do I fix CVE-2026-44186?

Upgrade apache to 2.4.68 or later.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2026-44186 being exploited?

There is no known exploitation of CVE-2026-44186 in the wild and no public exploit code.

Other vulnerabilities in Apache Http Server

• CVE-2021-42013 Apache HTTP Server Path Traversal Exploited Critical 9.8
• CVE-2024-38475 Apache HTTP Server Improper Escaping of Output Exploited Critical 9.1
• CVE-2021-40438 Apache HTTP Server-Side Request Forgery (SSRF) Exploited Critical 9.0
• CVE-2019-0211 Apache HTTP Server Privilege Escalation Exploited High 7.8
• CVE-2021-41773 Apache HTTP Server Path Traversal Exploited High 7.5

All Apache Http Server vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as ALPINE-CVE-2026-44186, AZL-89741, BELL-CVE-2026-44186, BIT-apache-2026-44186, CLSA-2026-1782144906, CLSA-2026-1782153378 and 10 more.