flightphp up to 3.18.0 CLI Command Call path traversal

Summaryinfo

A vulnerability, which was classified as critical, was found in flightphp up to 3.18.0. Affected is an unknown function of the component CLI Command Call Handler. Executing a manipulation can lead to path traversal. This vulnerability is handled as CVE-2026-42549. It is possible to launch the attack on the local host. There is not any exploit available. You should upgrade the affected component.

Detailsinfo

A vulnerability classified as critical was found in flightphp up to 3.18.0. This vulnerability affects some unknown functionality of the component CLI Command Call Handler. The manipulation with an unknown input leads to a path traversal vulnerability. The CWE definition for the vulnerability is 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. As an impact it is known to affect integrity, and availability. CVE summarizes:

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.

The advisory is shared for download at github.com. This vulnerability was named CVE-2026-42549 since 04/28/2026. The exploitation appears to be easy. The attack needs to be approached locally. There are neither technical details nor an exploit publicly available. The MITRE ATT&CK project declares the attack technique as T1006.

Upgrading to version 3.18.1 eliminates this vulnerability.

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Productinfo

Name

• flightphp

Version

• 3.0
• 3.1
• 3.2
• 3.3
• 3.4
• 3.5
• 3.6
• 3.7
• 3.8
• 3.9
• 3.10
• 3.11
• 3.12
• 3.13
• 3.14
• 3.15
• 3.16
• 3.17
• 3.18.0

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CPE 2.2info

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