6.0
MediumCVSS 4.0 · from GitHub_M
CVE-2026-118666
GraphQL Tools: Shared legacy executor routes one subscription's results to a different caller
graphql-tools · Information exposure · CWE-200Affectedgraphql-tools, executor-legacy-ws
FixNo fix listed yet.
PublishedOct 28, 20:45 · GitHub_M
ScoredOct 28 · 6.0 · GitHub_M
Exploit code publicNone known · checked 21:18 UTC
ExploitedNone known · CISA KEV checked 22:06 UTC
What we know
No known exploitation. CISA KEV, checked 22:06 UTC.
No public exploit code known. Exploit-DB, Metasploit, Nuclei, checked 21:18 UTC.
An attacker needs network access and an account. CVSS: network, low privileges.
It only works under certain conditions, which makes it harder to pull off. CVSS: high attack complexity.
A successful attack can read data. CVSS impact.
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.
From GitHub_M
Affected and fixed versions
ProductAffectedFixed ingraphql-tools< 9.0.36–executor-legacy-ws< 1.1.36–
Exploit code
Exploit-DBnone knownMetasploitnone knownNucleinone known