{"cve":"CVE-2026-118666","nvd":{"published":"2026-10-28T21:16:56.980","modified":"2026-10-28T21:16:56.980","status":"Received","description":"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.","cvss_v4":{"vector":"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","score":6.0},"cvss_v3":null,"cwes":["CWE-200"],"references":["https://github.com/ardatan/graphql-tools/commit/c2f226e6f68236be9e4a577f29faeaa92547458b","https://github.com/ardatan/graphql-tools/pull/8480","https://github.com/ardatan/graphql-tools/releases/tag/@graphql-tools/executor-legacy-ws@1.1.36","https://github.com/ardatan/graphql-tools/security/advisories/GHSA-mp66-8ww2-pcwm"],"products":[],"source":"nvd","synced_at":"2026-10-28T21:45:43.571453220+00:00"},"epss":null,"kev":null,"osv":[{"id":"GHSA-mp66-8ww2-pcwm","url":"https://osv.dev/vulnerability/GHSA-mp66-8ww2-pcwm","summary":"GraphQL Tools: Shared legacy executor routes one subscription's results to a different caller","modified":"2026-10-28T21:15:06.071885626Z","packages":[{"ecosystem":"npm","name":"@graphql-tools/executor-legacy-ws","purl":"pkg:npm/%40graphql-tools/executor-legacy-ws","ranges":["<1.1.36"],"fixed":["1.1.36"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}