CVE-2026-128025
Deferred Deferred - Pending Action

FrankenPHP Path Traversal via splitPos in cgi.go

Publication date: 2026-11-13

Last updated on: 2026-11-13

Assigner: VulnCheck

Description
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.

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Meta Information

Published
2026-11-13
Last Modified
2026-11-13
Generated
2026-11-13
AI Q&A
2026-11-13
EPSS Evaluated
N/A
NVD
CVE-2026-128025
EUVD
EUVD-2026-125077

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
frankenphp frankenphp to 1.13.0 (exc)

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Exploitability

CWE
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KEV
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CWE ID Description
CWE-436 Product A handles inputs or steps differently than Product B, which causes A to perform incorrect actions based on its perception of B's state.

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Executive Summary

FrankenPHP before 1.13.0 has a flaw where attackers can bypass security controls by embedding .php inside a filename component. This allows unauthenticated execution of protected PHP scripts via crafted paths like /uploads/a.php.txt/b.php, tricking the system into treating the path as valid despite route-level or WAF rules.

Detection Guidance

Check FrankenPHP versions before 1.13.0 by running frankenphp -v or inspecting package versions. Test for path-split conflicts by requesting paths like /uploads/a.php.txt/b.php to see if protected PHP scripts execute despite deny rules.

Impact Analysis

Attackers could execute unauthorized PHP scripts on your server, potentially leading to data breaches, unauthorized access, or further compromise of your system. This bypasses intended security measures, allowing malicious activity even if protections are in place.

Compliance Impact

This vulnerability could lead to unauthorized access or data exposure, violating GDPR's data protection requirements or HIPAA's safeguards for protected health information. Non-compliance risks legal penalties, fines, and reputational damage.

Mitigation Strategies

Upgrade FrankenPHP to version 1.13.0 or later immediately. Review and tighten WAF rules to block requests with embedded .php in path components. Audit server configurations to ensure route-level deny rules are enforced.

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