GraphQL Tools: Per-request connection parameters persist into later users' WebSocket authentications

{
  "id": "1022d621b069e0989a20c6c469a82b9209be7f63a703a9e2590070e2cdce1b0b",
  "url": "https://www.cve.org/CVERecord?id=CVE-2026-118665",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "GraphQL Tools: Per-request connection parameters persist into later users' WebSocket authentications",
    "summary": "GraphQL Tools provides utilities for building, stitching, and mocking GraphQL schemas. Prior to version 1.1.36 of the GraphQL Tools legacy WebSocket executor package, buildWSLegacyExecutor in packages/executors/legacy-ws/src/index.ts retains request.extensions.connectionParams in the closure-scoped executorConnectionParams object after cleanupWebsocket closes a connection. When one executor is reused across different authorization contexts, a later request that omits a sensitive key can send an earlier caller's Authorization or tenant value in its connection_init payload, causing the downstream server to authenticate the later caller as the earlier user. Applications that create a new executor for every request are not affected. This issue is fixed in version 1.1.36 of the GraphQL Tools legacy WebSocket executor package.",
    "evidence": "cve:CVE-2026-118665",
    "products": [
      {
        "name": {
          "value": "graphql-tools",
          "evidence": "/containers/cna/affected/0/product"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": []
      },
      {
        "name": {
          "value": "executor-legacy-ws",
          "evidence": "/containers/cna/affected/1/product"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-118665",
      "aliases": [
        "CVE-2026-118665"
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "version": "4.0",
            "baseScore": 8.2,
            "attackVector": "NETWORK",
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N",
            "userInteraction": "NONE",
            "attackComplexity": "HIGH",
            "attackRequirements": "PRESENT",
            "privilegesRequired": "NONE",
            "subIntegrityImpact": "NONE",
            "vulnIntegrityImpact": "NONE",
            "subAvailabilityImpact": "NONE",
            "vulnAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "vulnConfidentialityImpact": "HIGH"
          }
        }
      ],
      "affected": [
        {
          "vendor": "ardatan",
          "product": "graphql-tools",
          "versions": [
            {
              "status": "affected",
              "version": "< 9.0.36"
            }
          ]
        },
        {
          "vendor": "@graphql-tools",
          "product": "executor-legacy-ws",
          "versions": [
            {
              "status": "affected",
              "version": "< 1.1.36"
            }
          ]
        }
      ],
      "modified": "2026-10-28T20:41:47.228Z",
      "provider": "cve",
      "references": [
        "https://github.com/ardatan/graphql-tools/security/advisories/GHSA-434m-5hcj-pxf3",
        "https://github.com/ardatan/graphql-tools/pull/8480",
        "https://github.com/ardatan/graphql-tools/commit/c2f226e6f68236be9e4a577f29faeaa92547458b",
        "https://github.com/ardatan/graphql-tools/releases/tag/@graphql-tools/executor-legacy-ws@1.1.36"
      ],
      "provider_metadata": {
        "cna": {
          "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
          "shortName": "GitHub_M",
          "dateUpdated": "2026-10-28T20:41:47.228Z"
        }
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-118665",
        "evidence": "/cveMetadata/cveId"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/containers/cna/metrics"
  },
  "source_id": "core-cve",
  "document_id": 487934,
  "published_at": "2026-10-28T20:41:47.228+00:00"
}