CVE-2026-42549
Medium · 4.4CVSS
4.4
EPSS
0.2%
Published
May 13, 2026
CISA due date
—
The record
Flight is an extensible micro-framework for PHP. Prior to 3.18.1, the make:controller CLI command calls mkdir(..., recursive: true) on a path built from the user-supplied controller name, before Nette's class-name validation runs. The class-file write is correctly rejected by Nette when the name contains /, but the recursive directory creation side effect is already committed — including directories located outside the project root through ../ traversal. This vulnerability is fixed in 3.18.1.
Affected packages
| Ecosystem | Package | Introduced | Fixed |
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