CVE-2026-118666

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

No CVSS.

References

Link	Resource
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

Configurations

No configuration.

History

28 Oct 2026, 21:16

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-10-28 21:16

Updated : 2026-10-29 15:50

NVD link : CVE-2026-118666

Mitre link : CVE-2026-118666

CVE.ORG link : CVE-2026-118666

JSON object : View

Products Affected

No product.

CWE

CWE-200

Exposure of Sensitive Information to an Unauthorized Actor

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