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CVE-2026-118666— GraphQL Tools: Shared legacy executor routes one subscription's results to a different caller

Quick assessment

Affected
ardatan graphql-tools
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

GraphQL Tools 提供用于构建、拼接和模拟 GraphQL Schema 的工具。在 GraphQL Tools 的 legacy WebSocket executor 包版本 1.1.36 之前，位于 packages/executors/legacy-ws/src/index.ts 中的 buildWSLegacyExecutor 函数会复用同一个 WebSocket 连接，并在有新的重叠订阅启动时，替换其唯一的 websocket.onmessage 事件处理器。该处理器在将 LEGACY_WS.D

CVSS 6.0 · Medium
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I. Basic Information for CVE-2026-118666

Vulnerability Information
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Vulnerability Title
GraphQL Tools: Shared legacy executor routes one subscription's results to a different caller
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
信息暴露
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
ardatan graphql-tools < 9.0.36 -
@graphql-tools executor-legacy-ws < 1.1.36 -

II. Public POCs for CVE-2026-118666

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III. Intelligence Information for CVE-2026-118666

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Other References for CVE-2026-118666 (4)

IV. Related Vulnerabilities

Same product: graphql-tools
Same vendor: ardatan
Same weakness: CWE-200