{"id":"GHSA-hmfr-rx46-4jx2","summary":"GraphQL Armor Max-Depth Plugin Bypass via Introspection Query Obfuscation","details":"### Summary\nA query depth restriction using the `max-depth` property can be bypassed if `ignoreIntrospection` is enabled (which is the default configuration) by naming your query/fragment `__schema`.\n\n### Details\nAt the start of the `countDepth` function, we have the following check for the `ignoreIntrospection` option:\n\n```typescript\n    if (this.config.ignoreIntrospection && 'name' in node && node.name?.value === '__schema') {\n        return 0;\n    }\n```\n\nHowever, the `node` can be one of: `FieldNode`, `FragmentDefinitionNode`, `InlineFragmentNode`, `OperationDefinitionNode`, `FragmentSpreadNode`.\n\nFor example, consider sending the following query:\n\n```graphql\nquery hello {\n  books {\n    title\n  }\n}\n```\n\nThis would create an `OperationDefinitionNode` where `node.name.value == 'hello'`\n\nThe proper way to handle this is to check explicitly for the `__schema` field, which corresponds to a `FieldNode`.\n\nThe fix is\n\n```typescript\n    if (\n      this.config.ignoreIntrospection &&\n      'name' in node &&\n      node.name?.value === '__schema' &&\n      node.kind === Kind.FIELD\n    ) {\n      return 0;\n    }\n```\n\nThis ensures that the node is explicitly a `FieldNode`.\n\n### PoC\n\nMax depth: `6`\n\n```graphql\nquery {\n  books {\n    author {\n      books {\n        author {\n          ...__schema\n        }\n      }\n    }\n  }\n}\nfragment __schema on Author {\n  books {\n    title\n  }\n}\n```\n\n### Impact\n\nThis issue affects applications using the GraphQL Armor Depth Limit plugin with `ignoreIntrospection` enabled.\n\n### Fix\n\nThis is fixed in [PR#823](https://github.com/Escape-Technologies/graphql-armor/pull/823)","modified":"2025-08-26T18:42:37Z","published":"2025-08-26T18:42:37Z","database_specific":{"severity":"MODERATE","github_reviewed":true,"github_reviewed_at":"2025-08-26T18:42:37Z","nvd_published_at":null,"cwe_ids":["CWE-400"]},"references":[{"type":"WEB","url":"https://github.com/Escape-Technologies/graphql-armor/security/advisories/GHSA-hmfr-rx46-4jx2"},{"type":"WEB","url":"https://github.com/Escape-Technologies/graphql-armor/pull/823"},{"type":"WEB","url":"https://github.com/Escape-Technologies/graphql-armor/commit/1f923bc09f5f053f60b6ba2bd419d4b94cbe1db3"},{"type":"PACKAGE","url":"https://github.com/Escape-Technologies/graphql-armor"}],"affected":[{"package":{"name":"@escape.tech/graphql-armor-max-depth","ecosystem":"npm","purl":"pkg:npm/%40escape.tech/graphql-armor-max-depth"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"2.4.2"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2025/08/GHSA-hmfr-rx46-4jx2/GHSA-hmfr-rx46-4jx2.json","last_known_affected_version_range":"\u003c= 2.4.1"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L"}]}