php FrankenPHP up to 1.12.x cgi.go splitPos path traversal

Summaryinfo

A vulnerability classified as critical was found in php FrankenPHP up to 1.12.x. This impacts the function splitPos of the file cgi.go. Such manipulation leads to path traversal. This vulnerability is referenced as CVE-2026-128025. It is possible to launch the attack remotely. No exploit is available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability was found in php FrankenPHP up to 1.12.x. It has been rated as critical. Affected by this issue is the function splitPos of the file cgi.go. The manipulation with an unknown input leads to a path traversal vulnerability. Using CWE to declare the problem leads to CWE-22. The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. Impacted is confidentiality, integrity, and availability. CVE summarizes:

FrankenPHP before 1.13.0 contains a path-split interpretation conflict in splitPos in cgi.go that allows unauthenticated attackers to execute protected PHP scripts by embedding .php inside a filename component. Attackers can request paths like /uploads/a.php.txt/b.php to execute uploads/a.php despite route-level or WAF deny rules and forge PATH_INFO, SCRIPT_NAME, and PHP_SELF values.

The advisory is shared for download at github.com. This vulnerability is handled as CVE-2026-128025 since 11/12/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1006.

Upgrading to version 1.13.0 eliminates this vulnerability.

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Productinfo

Type

• Programming Language Software

Vendor

• php

Name

• FrankenPHP

Version

• 1.0
• 1.1
• 1.2
• 1.3
• 1.4
• 1.5
• 1.6
• 1.7
• 1.8
• 1.9
• 1.10
• 1.11
• 1.12

License

• open-source

Website

• Product: https://github.com/php/frankenphp/

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CPE 2.2info

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