CVE-2026-118666

UNKNOWN 0.0

GraphQL Tools: Shared legacy executor routes one subscription's results to a different caller

CVSS Score

0.0

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-200
Vendor	ardatan
Product	graphql-tools
Published	Oct 28, 2026

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Affected Versions

ardatan / graphql-tools

< 9.0.36

@graphql-tools / executor-legacy-ws

< 1.1.36

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/ardatan/graphql-tools/security/advisories/GHSA-mp66-8ww2-pcwm github.com: https://github.com/ardatan/graphql-tools/pull/8480 github.com: https://github.com/ardatan/graphql-tools/commit/c2f226e6f68236be9e4a577f29faeaa92547458b github.com: https://github.com/ardatan/graphql-tools/releases/tag/@graphql-tools/[email protected]