adonisjs core up to 10.1.1 Multipart File path traversal

Summaryinfo

A vulnerability classified as critical was found in adonisjs core up to 10.1.1. This vulnerability affects unknown code of the component Multipart File Handler. Executing a manipulation can lead to path traversal. This vulnerability is registered as CVE-2026-21440. It is possible to launch the attack remotely. No exploit is available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability has been found in adonisjs core up to 10.1.1 and classified as critical. This vulnerability affects an unknown function of the component Multipart File 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 confidentiality, integrity, and availability. CVE summarizes:

AdonisJS is a TypeScript-first web framework. A Path Traversal vulnerability in AdonisJS multipart file handling may allow a remote attacker to write arbitrary files to arbitrary locations on the server filesystem. This impacts @adonisjs/bodyparser through version 10.1.1 and 11.x prerelease versions prior to 11.0.0-next.6. This issue has been patched in @adonisjs/bodyparser versions 10.1.2 and 11.0.0-next.6.

The advisory is available at github.com. This vulnerability was named CVE-2026-21440 since 12/29/2025. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. The technical details are unknown and an exploit is not available. This vulnerability is assigned to T1006 by the MITRE ATT&CK project.

Upgrading to version 10.1.2 or 11.0.0-next.6 eliminates this vulnerability. The upgrade is hosted for download at github.com. Applying the patch 143a16f35602be8561215611582211dec280cae6 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

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Productinfo

Vendor

• adonisjs

Name

• core

Version

• 10.1.0
• 10.1.1

License

• open-source

Website

• Product: https://github.com/adonisjs/core/

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