GraphQL Tools: Per-request connection parameters persist into later users' WebSocket authentications

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS 4.0

8.2 · CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N · score source

EPSS

• CVE-2026-118665: 0.39% estimated exploitation activity in the next 30 days; percentile 32.95 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

Stale authentication state in `@graphql-tools/executor-legacy-ws`: per-request `extensions.connectionParams` persist in executor closure state and are replayed in a later caller's `connection_init`

Report metadata | Field | Value | | --- | --- | | Package | `@graphql-tools/executor-legacy-ws` (npm, `pkg:npm/%40graphql-tools/executor-legacy-ws`) | | Repository | https://github.com/ardatan/graphql-tools | | Component | `buildWSLegacyExecutor` (`packages/executors/legacy-ws/src/index.ts`) | | Vulnerability class | Stale authentication state / credential reuse across requests | | Verified against | Commit `b5d1c36ebb8ed3868260ffee5bbcbb423ad5c1f1`; npm release `1.1.33` installed and exercised. During validation the same behaviour was also observed on the current latest release `1.1.35`, and the unreset closure is still present on `master`. | | API surface | Public documented API (`buildWSLegacyExecutor`, and `request.extensions.connectionParams` on the returned executor) | |…

Published by the source

28 Oct 2026, 21:05 UTC

Last modified by the source

28 Oct 2026, 21:15 UTC

Source last checked

29 Oct 2026, 06:00 UTC

1. Revision 2 · amended · 29 Oct 2026

   Amended from osv record GHSA-434m-5hcj-pxf3

2. Revision 1 · created · 28 Oct 2026

   Published from ghsa record GHSA-434m-5hcj-pxf3

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# Patch Next advisory brief: CVE-2026-118665

Advisory: GraphQL Tools: Per-request connection parameters persist into later users' WebSocket authentications
IDs: CVE-2026-118665, GHSA-434m-5hcj-pxf3
Record: https://patchnext.com/advisories/cve-2026-118665 (revision 2, source checked 29 Oct 2026, 06:00 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 8.2)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: @graphql-tools/executor-legacy-ws 1.1.36. A vendor fix does not mean a deployment is fixed.

## Affected components
- npm @graphql-tools/executor-legacy-ws: affected < 1.1.36; fixed in 1.1.36

## Suggested inspection (read-only)
- `npm ls @graphql-tools/executor-legacy-ws --all`: lists every installed copy and version, including transitive ones. Run in the project root after `npm ci`.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on @graphql-tools/executor-legacy-ws.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-434m-5hcj-pxf3 (GitHub-reviewed advisory GHSA-434m-5hcj-pxf3 lists affected ranges: npm @graphql-tools/executor-legacy-ws >=0 <=1.1.35)
- Verified: https://osv.dev/vulnerability/GHSA-434m-5hcj-pxf3 (OSV record GHSA-434m-5hcj-pxf3 lists affected ranges: npm @graphql-tools/executor-legacy-ws >=0 <1.1.36 (fixed))

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