CVE-2026-45062

HIGH

FrankenPHP: Unsafe Unicode Handling in CGI Path Splitting Allows Execution of Non-PHP Files

Title source: cna
STIX 2.1

Description

FrankenPHP is a modern application server for PHP. From version 1.11.2 to before version 1.12.3, the splitPos() function in cgi.go misuses golang.org/x/text/search with search.IgnoreCase when the request path contains a non-ASCII byte. Two distinct flaws in that fallback let an attacker mislead FrankenPHP into treating a non-.php file as a .php script. In any deployment where the attacker can place content into a file served by FrankenPHP (uploads, file storage, etc.), this can be escalated to remote code execution by crafting a URL whose path triggers either flaw. This issue has been patched in version 1.12.3.

References (2)

Core 2
Core References
X_Refsource_Misc x_refsource_misc
https://github.com/php/frankenphp/releases/tag/v1.12.3

Scores

CVSS v3 8.1
EPSS 0.0057
EPSS Percentile 42.4%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

CISA SSVC

Vulnrichment
Exploitation poc
Automatable no
Technical Impact total

Details

CWE
CWE-176 CWE-178 CWE-20
Status published
Products (2)
dunglas/frankenphp 1.11.2 - 1.12.3Go
php/frankenphp >= 1.11.2, < 1.12.3
Published Jun 10, 2026
Tracked Since Jun 11, 2026