CVE-2026-118666

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{"affected": [{"affectedData": [{"product": "graphql-tools", "vendor": "ardatan", "versions": [{"status": "affected", "version": "< 9.0.36"}]}, {"product": "executor-legacy-ws", "vendor": "@graphql-tools", "versions": [{"status": "affected", "version": "< 1.1.36"}]}], "source": "security-advisories@github.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "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 reuses one WebSocket and replaces its single websocket.onmessage handler whenever a new overlapping subscription starts. The handler delivers LEGACY_WS.DATA frames to the newest observer without comparing data.id with the subscription operation id, so a caller using the same executor can receive another user's authorized subscription payload while the earlier caller's stream is starved. This issue is fixed in version 1.1.36 of the GraphQL Tools legacy WebSocket executor package."}], "id": "CVE-2026-118666", "lastModified": "2026-11-03T00:17:18.020", "metrics": {"cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "HIGH", "attackRequirements": "PRESENT", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 6.0, "baseSeverity": "MEDIUM", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "privilegesRequired": "LOW", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:H/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "version": "4.0", "vulnAvailabilityImpact": "LOW", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "NONE", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-118666", "options": [{"exploitation": "poc"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-11-02T23:58:06.321580Z", "version": "2.0.3"}}]}, "published": "2026-10-28T21:16:56.980", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/ardatan/graphql-tools/commit/c2f226e6f68236be9e4a577f29faeaa92547458b"}, {"source": "security-advisories@github.com", "url": "https://github.com/ardatan/graphql-tools/pull/8480"}, {"source": "security-advisories@github.com", "url": "https://github.com/ardatan/graphql-tools/releases/tag/@graphql-tools/executor-legacy-ws@1.1.36"}, {"source": "security-advisories@github.com", "url": "https://github.com/ardatan/graphql-tools/security/advisories/GHSA-mp66-8ww2-pcwm"}, {"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "url": "https://github.com/ardatan/graphql-tools/security/advisories/GHSA-mp66-8ww2-pcwm"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Awaiting Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-200"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{"bugzilla": {"description": "executor-legacy-ws: executor-legacy-ws: Information disclosure via overlapping WebSocket subscriptions", "id": "2563191", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2563191"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.9", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:L", "status": "draft"}, "cwe": "CWE-488", "details": ["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 reuses one WebSocket and replaces its single websocket.onmessage handler whenever a new overlapping subscription starts. The handler delivers LEGACY_WS.DATA frames to the newest observer without comparing data.id with the subscription operation id, so a caller using the same executor can receive another user's authorized subscription payload while the earlier caller's stream is starved. This issue is fixed in version 1.1.36 of the GraphQL Tools legacy WebSocket executor package.", "A flaw was found in the GraphQL Tools legacy WebSocket executor. When handling concurrent subscriptions, the executor reuses a single WebSocket connection and replaces the active message handler without validating incoming subscription operation identifiers. A user sharing the executor can exploit this vulnerability by initiating an overlapping subscription, leading to information disclosure through intercepting another user's subscription payload while starving the earlier subscriber's data stream."], "name": "CVE-2026-118666", "public_date": "2026-10-28T20:45:58Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-118666\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-118666\nhttps://github.com/ardatan/graphql-tools/commit/c2f226e6f68236be9e4a577f29faeaa92547458b\nhttps://github.com/ardatan/graphql-tools/pull/8480\nhttps://github.com/ardatan/graphql-tools/releases/tag/@graphql-tools/executor-legacy-ws@1.1.36\nhttps://github.com/ardatan/graphql-tools/security/advisories/GHSA-mp66-8ww2-pcwm"], "statement": "This vulnerability is rated as Moderate severity because, while an unauthorized party could intercept another subscriber's private data stream, successful exploitation requires concurrent overlapping subscriptions on an executor instance shared across multiple client contexts. Applications that create dedicated executor instances per client request or use modern GraphQL WebSocket transport protocols instead of the legacy executor package are not vulnerable to this cross-tenant data routing defect. Under typical Red Hat environments, the legacy WebSocket executor is not deployed or utilized by default.", "threat_severity": "Moderate"}

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