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CVE-2026-21440 PoC — AdonisJS Path Traversal in Multipart File Handling

Source
https://github.com/redpack-kr/Ashwesker-CVE-2026-21440
Associated Vulnerability
Title:AdonisJS Path Traversal in Multipart File Handling (CVE-2026-21440)
Description: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.
Description
CVE-2026-21440
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