GraphQL Tools: TLS Certificate Validation Disabled in Legacy GraphQL WebSocket Executor (CVE-2026-103921) | HOL Guard CVE

High · CVSS 7.4CVE-2026-103921

GraphQL Tools: TLS Certificate Validation Disabled in Legacy GraphQL WebSocket Executor

Answer in brief

CVE-2026-103921 records a High severity (CVSS 7.4) vulnerability in GraphQL Tools: TLS Certificate Validation Disabled in Legacy GraphQL WebSocket Executor. The current sources do not mark it as known exploited. The current feed maps @graphql-tools/executor-legacy-ws (generic), ardatan/graphql-tools (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Oct 1, 2026Updated Oct 1, 2026Source checked Oct 1, 2026First seen by HOL Oct 1, 2026Material review Oct 1, 2026

Upstream Advisory

Key facts

Risk: High · CVSS 7.4
Exploitation: Not marked as known exploited
Affected software: 2 mapped packages or products
Fix availability: Available

Why this deserves its current priority

CVSS is 7.4. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps @graphql-tools/executor-legacy-ws (generic), ardatan/graphql-tools (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
@graphql-tools/executor-legacy-wsgeneric	<1.1.35	1.1.35
ardatan/graphql-toolsgeneric	<1.1.35	1.1.35

Recommended response

Check inventory. Check lockfiles and deployed manifests for @graphql-tools/executor-legacy-ws, ardatan/graphql-tools.
Review the reported fix. Update @graphql-tools/executor-legacy-ws to 1.1.35; ardatan/graphql-tools to 1.1.35 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Oct 1, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Oct 1, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Oct 1, 2026

Sources and claim methodology

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.