A critical vulnerability, tracked as CVE-2026-21440, has been identified in the multipart file handling component of the AdonisJS web framework. This flaw allows remote attackers to exploit a path traversal weakness, enabling arbitrary file writes to any location on the server filesystem. The vulnerability affects @adonisjs/bodyparser through version 10.1.1 and 11.x prerelease versions prior to 11.0.0-next.6, and has been assigned a CVSS 4.0 critical severity rating.
The issue has been addressed in patched releases: @adonisjs/bodyparser versions 10.1.2 and 11.0.0-next.6. Organizations using AdonisJS are strongly advised to update to the latest secure versions to mitigate the risk of remote code execution and potential server compromise. No specific affected product table has been published, but the vulnerability is confirmed to be remotely exploitable and poses a significant threat to unpatched deployments.

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CVE-2026-21440 was publicly disclosed as a critical path traversal vulnerability with CVSS 9.2, allowing unauthenticated remote attackers to write arbitrary files on affected servers. Public advisories warned that the issue could lead to remote code execution depending on server configuration.
AdonisJS released fixes for CVE-2026-21440 in @adonisjs/bodyparser version 10.1.2 and 11.0.0-next.6. The vulnerability affects versions through 10.1.1 and prerelease 11.x versions before 11.0.0-next.6.
Security researcher Hunter Wodzenski (also referred to as Wodzen) discovered and reported a path traversal vulnerability in the @adonisjs/bodyparser package used by AdonisJS multipart file handling. The flaw stems from unsafe handling of client-supplied filenames in MultipartFile.move(), enabling arbitrary file writes.
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