CVE-2026-118665

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CVE-2026-118665

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

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 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.

References: https://github.com/ardatan/graphql-tools/releases/tag/@graphql-tools/[email protected], https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/118xxx/CVE-2026-118665.json, https://github.com/ardatan/graphql-tools/security/advisories/GHSA-434m-5hcj-pxf3, https://nvd.nist.gov/vuln/detail/CVE-2026-118665, https://github.com/ardatan/graphql-tools/commit/c2f226e6f68236be9e4a577f29faeaa92547458b, https://github.com/ardatan/graphql-tools/pull/8480