CVE-2026-48795: @adonisjs/bodyparser @adonisjs/bodyparser Has An Incomplete Fix Vulnerability

{
  "schema_version" : "1.4.0",
  "id" : "GHSA-qcm7-3vpr-hj5h",
  "modified" : "2026-06-30T18:34:32Z",
  "published" : "2026-06-30T18:34:32Z",
  "aliases" : [ "CVE-2026-48795" ],
  "summary" : "@adonisjs/bodyparser has an incomplete fix for CVE-2026-25754",
  "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- `>= 10.1.3 < 10.1.5`\n- `>= 11.0.0-next.9 < 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",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "npm",
      "name" : "@adonisjs/bodyparser"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "10.1.3"
      }, {
        "fixed" : "10.1.5"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 10.1.4"
    }
  }, {
    "package" : {
      "ecosystem" : "npm",
      "name" : "@adonisjs/bodyparser"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "11.0.0-next.9"
      }, {
        "fixed" : "11.0.3"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 11.0.1"
    }
  } ],
  "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"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-1321" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-06-30T18:34:32Z",
    "nvd_published_at" : null
  }
}