Input validation error in Apache HTTP Server - CVE-2026-63045
Published: October 1, 2026
Vulnerability identifier: #VU153104
CSH Severity: Low
CVSS v4: 0 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-63045
CWE-ID: CWE-20
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause the proxy to open a data connection to an arbitrary third-party host.
The vulnerability exists due to improper input validation in mod_proxy_ftp PASV reply address handling when processing a crafted PASV response from an untrusted FTP server. A remote attacker can send a crafted PASV response to cause the proxy to open a data connection to an arbitrary third-party host.
The issue is limited to forward proxy configurations.
Affected software
Apache HTTP Server
How to mitigate CVE-2026-63045
Install security update from vendor's website.
Apache HTTP Server - update to 2.4.69