GHSA-7MX3-VVMW-HJMV

Vulnerability from github – Published: 2026-10-05 22:56 – Updated: 2026-10-05 22:56
VLAI
Summary
GraphQL Tools has prototype pollution in well-established utility function `mergeDeep`
Details

Closed by https://github.com/ardatan/graphql-tools/pull/8423 Mitigated in Hive Gateway by https://github.com/graphql-hive/gateway/pull/2600

A client can alias fields to constructor, __proto__ or prototype so that the response keys from two subgraphs collide on those names during result merging. Because mergeDeep recursed through inherited properties, the merge walked {}.constructor to Object, then Object.__proto__ to Function.prototype, and wrote a subgraph-supplied value over Function.prototype.call, breaking every subsequent request in the process until restart. This is remotely triggerable by an unauthenticated client with a single query against any supergraph that merges an object from two subgraphs, which is the ordinary @shareable or entity case, so it is a denial of service rather than a theoretical hardening issue.

{
  shared {
    fieldA
    constructor: fieldB {
      __proto__: child {
        call: value
      }
    }
  }
}
Severity
8.2 (High)
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
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{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 12.0.0"
      },
      "package": {
        "ecosystem": "npm",
        "name": "@graphql-tools/utils"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "12.0.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-104852"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-1321"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-10-05T22:56:46Z",
    "nvd_published_at": null,
    "severity": "HIGH"
  },
  "details": "Closed by https://github.com/ardatan/graphql-tools/pull/8423\nMitigated in Hive Gateway by https://github.com/graphql-hive/gateway/pull/2600\n\nA client can alias fields to `constructor`, `__proto__` or `prototype` so that the response keys from two subgraphs collide on those names during result merging. Because `mergeDeep` recursed through inherited properties, the merge walked `{}.constructor` to `Object`, then `Object.__proto__` to `Function.prototype`, and wrote a subgraph-supplied value over `Function.prototype.call`, breaking every subsequent request in the process until restart. This is remotely triggerable by an unauthenticated client with a single query against any supergraph that merges an object from two subgraphs, which is the ordinary `@shareable` or entity case, so it is a denial of service rather than a theoretical hardening issue.\n\n\n```graphql\n{\n  shared {\n    fieldA\n    constructor: fieldB {\n      __proto__: child {\n        call: value\n      }\n    }\n  }\n}\n```",
  "id": "GHSA-7mx3-vvmw-hjmv",
  "modified": "2026-10-05T22:56:47Z",
  "published": "2026-10-05T22:56:46Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/ardatan/graphql-tools/security/advisories/GHSA-7mx3-vvmw-hjmv"
    },
    {
      "type": "WEB",
      "url": "https://github.com/ardatan/graphql-tools/pull/8423"
    },
    {
      "type": "WEB",
      "url": "https://github.com/graphql-hive/gateway/pull/2600"
    },
    {
      "type": "WEB",
      "url": "https://github.com/ardatan/graphql-tools/commit/0b9529f1988fd36186a7c106a6efe0356f1b7f2e"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/ardatan/graphql-tools"
    },
    {
      "type": "WEB",
      "url": "https://github.com/ardatan/graphql-tools/releases/tag/@graphql-tools/utils@12.0.1"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "GraphQL Tools has prototype pollution in well-established utility function `mergeDeep`"
}



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