Improper Certificate Validation Affecting @graphql-tools/executor-legacy-ws package, versions <1.1.35
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-JS-GRAPHQLTOOLSEXECUTORLEGACYWS-20510283
- published5 Oct 2026
- disclosed1 Oct 2026
- creditUnknown
Introduced: 1 Oct 2026
NewCVE-2026-103921 (opens in a new tab)How to fix?
Upgrade @graphql-tools/executor-legacy-ws to version 1.1.35 or higher.
Overview
@graphql-tools/executor-legacy-ws is an A set of utils for faster development of GraphQL tools
Affected versions of this package are vulnerable to Improper Certificate Validation via a hardcoded rejectUnauthorized: false in buildWSLegacyExecutor, which unconditionally disables TLS certificate validation for all wss:// connections and cannot be overridden by callers. An attacker positioned between the client and the server can intercept or tamper with the WebSocket traffic by presenting an invalid or self-signed certificate that is silently accepted. This exposes the full contents of GraphQL subscription traffic to a MitM attacker, resulting in high confidentiality and integrity impact.