GHSA-QCM7-3VPR-HJ5H

Vulnerability from github – Published: 2026-06-30 18:34 – Updated: 2026-06-30 18:34
VLAI
Summary
@adonisjs/bodyparser has an incomplete fix for CVE-2026-25754
Details

Summary

The fix for GHSA-f5x2-vj4h-vg4c / CVE-2026-25754 introduced in commit 40e1c71 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

Severity
8.6 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H
Show details on source website
To clipboard 

{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 10.1.4"
      },
      "package": {
        "ecosystem": "npm",
        "name": "@adonisjs/bodyparser"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "10.1.3"
            },
            {
              "fixed": "10.1.5"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 11.0.1"
      },
      "package": {
        "ecosystem": "npm",
        "name": "@adonisjs/bodyparser"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "11.0.0-next.9"
            },
            {
              "fixed": "11.0.3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-48795"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-1321"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-06-30T18:34:32Z",
    "nvd_published_at": null,
    "severity": "HIGH"
  },
  "details": "### Summary\n\nThe 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.\n\nThe 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.\n\nThis issue is exploitable remotely through a single unauthenticated `multipart/form-data` request using the default configuration.\n\n### Affected versions\n\n- `\u003e= 10.1.3 \u003c 10.1.5`\n- `\u003e= 11.0.0-next.9 \u003c 11.0.3`\n\n### Details\n\nThe regression tests added by the original fix only covered direct payloads such as:\n\n- `__proto__.polluted`\n- `constructor.prototype.polluted`\n\nThese payloads are blocked because the root object no longer inherits from `Object.prototype`.\n\nHowever, 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`.\n\n### Impact\n\nAn unauthenticated attacker can remotely pollute `Object.prototype` on any route accepting multipart/form-data requests behind `BodyParserMiddleware`.\n\nBecause 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.\n\n### Patches\n\nFixes targeting v6 and v7 have been published below.\n\nUsers should upgrade to a version that includes the following fix:\n\n- https://github.com/adonisjs/bodyparser/releases/tag/v10.1.5\n- https://github.com/adonisjs/bodyparser/releases/tag/v11.0.3\n\n### References\n\n- [CWE-1321](https://cwe.mitre.org/data/definitions/1321.html)\n- Prior advisory this bypasses: [GHSA-f5x2-vj4h-vg4c](https://github.com/adonisjs/core/security/advisories/GHSA-f5x2-vj4h-vg4c) / CVE-2026-25754",
  "id": "GHSA-qcm7-3vpr-hj5h",
  "modified": "2026-06-30T18:34:32Z",
  "published": "2026-06-30T18:34:32Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/adonisjs/core/security/advisories/GHSA-f5x2-vj4h-vg4c"
    },
    {
      "type": "WEB",
      "url": "https://github.com/adonisjs/core/security/advisories/GHSA-qcm7-3vpr-hj5h"
    },
    {
      "type": "WEB",
      "url": "https://github.com/adonisjs/bodyparser/commit/40e1c71f958cffb74f6b91bed6630dca979062ed"
    },
    {
      "type": "WEB",
      "url": "https://github.com/adonisjs/bodyparser/releases/tag/v10.1.5"
    },
    {
      "type": "WEB",
      "url": "https://github.com/adonisjs/bodyparser/releases/tag/v11.0.3"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/adonisjs/core"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "@adonisjs/bodyparser has an incomplete fix for CVE-2026-25754"
}



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