CVE-2026-103921
Published:October 01, 2026
Updated:October 08, 2026
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.
Affected Packages
https://github.com/ardatan/graphql-tools.git (GITHUB):
Affected version(s) >=@graphql-tools/executor-legacy-ws@1.0.0 <@graphql-tools/executor-legacy-ws@1.1.35Fix Suggestion:
Update to version @graphql-tools/executor-legacy-ws@1.1.35@graphql-tools/executor-legacy-ws (NPM):
Affected version(s) >=0.0.1-alpha-20221108142800-3beb5fe2 <1.1.35Fix Suggestion:
Update to version 1.1.35@graphql-tools/executor-legacy-ws (NPM):
Affected version(s) >=1.0.0-alpha-20230517123108-df347e95 <1.1.35Fix Suggestion:
Update to version 1.1.35Related Resources (7)
Do you need more information?
Contact UsCVSS v4
Base Score:
9.1
Attack Vector
NETWORK
Attack Complexity
HIGH
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
HIGH
Vulnerable System Integrity
HIGH
Vulnerable System Availability
NONE
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
7.4
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
NONE
Weakness Type (CWE)
Improper Certificate Validation
EPSS
Base Score:
0.27