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

Advisory record · `GHSA-mp66-8ww2-pcwm`

- **Identifiers:** `GHSA-mp66-8ww2-pcwm` · `CVE-2026-118666`
- **State:** Confirmed
- **Severity:** CVSS 6.0 Medium
- **Critical:** No
- **Weakness (CWE):** [CWE-200](https://cwe.mitre.org/data/definitions/200.html)
- **Tags:** [Information disclosure](https://agentprime.io/advisories/tag/info-disclosure.md)
- **Published:** 28 Oct 2026
- **Updated:** 28 Oct 2026
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 28 Oct 2026, 21:05 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Affected packages

- `@graphql-tools/executor-legacy-ws` (npm): affected `<1.1.36`; fixed in `1.1.36`

## Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

## Severity and exploitation

- 6.0 Medium, CVSS 4.0: `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`, from CNA (GitHub_M)

- **CISA KEV:** Not listed.
- **EPSS:** 0.0034, the 27th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

- 28 Oct 2026, 20:45 UTC: [Confirmed by the CVE List](https://www.cve.org/CVERecord?id=CVE-2026-118666)
- 28 Oct 2026, 21:16 UTC: [Confirmed by NVD](https://nvd.nist.gov/vuln/detail/CVE-2026-118666)
- 31 Oct 2026, 13:32 UTC: First seen by agentprime
- 31 Oct 2026, 13:32 UTC: [Confirmed by OSV](https://osv.dev/vulnerability/GHSA-mp66-8ww2-pcwm)

## Sources

- [GitHub Advisory Database: GHSA-mp66-8ww2-pcwm](https://github.com/advisories/GHSA-mp66-8ww2-pcwm)
- [OSV: GHSA-mp66-8ww2-pcwm](https://osv.dev/vulnerability/GHSA-mp66-8ww2-pcwm)
- <https://github.com/ardatan/graphql-tools/security/advisories/GHSA-mp66-8ww2-pcwm>
- <https://github.com/ardatan/graphql-tools/pull/8480>
- <https://github.com/ardatan/graphql-tools/commit/c2f226e6f68236be9e4a577f29faeaa92547458b>
- <https://github.com/ardatan/graphql-tools>
- <https://github.com/ardatan/graphql-tools/releases/tag/@graphql-tools/executor-legacy-ws@1.1.36>

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.

## Check whether this affects you

A Match means an installed version is in the affected range above. Most don’t affect the app; agentprime hasn’t analysed this one yet.

- With the agentprime MCP server (<https://api.agentprime.io/mcp>), ask your agent to check the project: `check_lockfile` sends a lockfile, `check_packages` a list of installed packages, and both return the Matches and the upgrades that clear them. `get_advisory` returns this record. Setup: <https://agentprime.io/mcp.md>
- In a browser: <https://agentprime.io/check/> reads your lockfile in the browser, never uploading it.
- Whether it touches your code, with file and line: the Claude Code plugin, <https://agentprime.io/plugin.md>
- As JSON: <https://api.agentprime.io/v1/advisories/GHSA-mp66-8ww2-pcwm>, or `POST https://api.agentprime.io/v1/match` with your packages (<https://agentprime.io/api.md>)

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The web page: <https://agentprime.io/advisories/GHSA-mp66-8ww2-pcwm/>. Everything for agents: <https://agentprime.io/llms.txt>.