---
id: CVE-2026-48795
title: '@adonisjs/bodyparser has an incomplete fix for CVE-2026-25754'
summary: '@adonisjs/bodyparser has an incomplete fix for CVE-2026-25754'
severity: high
cvss: 8.6
cwe:
  - CWE-1321
vendor: adonisjs
product: '@adonisjs/bodyparser'
ecosystem: npm
affected:
  - '@adonisjs/bodyparser >= 10.1.3, <= 10.1.4'
  - '@adonisjs/bodyparser >= 11.0.0-next.9, <= 11.0.1'
patched:
  - '@adonisjs/bodyparser 10.1.5'
  - '@adonisjs/bodyparser 11.0.3'
published: '2026-06-30'
updated: '2026-06-30'
source: GHSA
sourceUrl: 'https://github.com/advisories/GHSA-qcm7-3vpr-hj5h'
references:
  - url: 'https://github.com/adonisjs/core/security/advisories/GHSA-f5x2-vj4h-vg4c'
  - url: 'https://github.com/adonisjs/core/security/advisories/GHSA-qcm7-3vpr-hj5h'
  - url: >-
      https://github.com/adonisjs/bodyparser/commit/40e1c71f958cffb74f6b91bed6630dca979062ed
  - url: 'https://github.com/adonisjs/bodyparser/releases/tag/v10.1.5'
  - url: 'https://github.com/adonisjs/bodyparser/releases/tag/v11.0.3'
  - url: 'https://github.com/advisories/GHSA-qcm7-3vpr-hj5h'
tags:
  - ghsa
  - npm
ingestedAt: '2026-06-30T21:24:14.398Z'
epss: 0.00547
epssPercentile: 0.44728
---

## Overview

### Summary

The fix for [GHSA-f5x2-vj4h-vg4c](https://github.com/adonisjs/core/security/advisories/GHSA-f5x2-vj4h-vg4c) / CVE-2026-25754 introduced in commit [`40e1c71`](https://github.com/adonisjs/bodyparser/commit/40e1c71f958cffb74f6b91bed6630dca979062ed) is incomplete and can be bypassed through nested prototype pollution payloads.

The original patch replaced the internal `FormFields` storage object with `Object.create(null)`, preventing direct payloads such as `__proto__.polluted`. However, payloads containing a non-dangerous segment before `__proto__` or `constructor.prototype`, such as `user.__proto__.polluted`, still lead to `Object.prototype` pollution.

This issue is exploitable remotely through a single unauthenticated `multipart/form-data` request using the default configuration.

### Affected versions

- `>= 10.1.3 < 10.1.5`
- `>= 11.0.0-next.9 < 11.0.3`

### Details

The regression tests added by the original fix only covered direct payloads such as:

- `__proto__.polluted`
- `constructor.prototype.polluted`

These payloads are blocked because the root object no longer inherits from `Object.prototype`.

However, lodash `_.set()` (via `@poppinss/utils`) still creates intermediate objects using plain `{}` values. Once a normal segment is encountered, subsequent `__proto__` or `constructor.prototype` segments regain access to `Object.prototype`.

### Impact

An unauthenticated attacker can remotely pollute `Object.prototype` on any route accepting multipart/form-data requests behind `BodyParserMiddleware`.

Because the pollution is process-wide, the impact may include authorization bypasses, unexpected behavior in downstream libraries, or prototype pollution gadget chains leading to remote code execution.

### Patches

Fixes targeting v6 and v7 have been published below.

Users should upgrade to a version that includes the following fix:

- https://github.com/adonisjs/bodyparser/releases/tag/v10.1.5
- https://github.com/adonisjs/bodyparser/releases/tag/v11.0.3

### References

- [CWE-1321](https://cwe.mitre.org/data/definitions/1321.html)
- Prior advisory this bypasses: [GHSA-f5x2-vj4h-vg4c](https://github.com/adonisjs/core/security/advisories/GHSA-f5x2-vj4h-vg4c) / CVE-2026-25754

## Affected packages

- `@adonisjs/bodyparser >= 10.1.3, <= 10.1.4`
- `@adonisjs/bodyparser >= 11.0.0-next.9, <= 11.0.1`

## Remediation

Upgrade to a patched release:

- `@adonisjs/bodyparser 10.1.5`
- `@adonisjs/bodyparser 11.0.3`