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CVE-2026-103921

7.4 · HIGH

GraphQL Tools provides utilities for building, stitching, and mocking GraphQL schemas.

Published Oct 1, 2026CWE-295EPSS 0.27%

Overview

CVE-2026-103921 is a high-severity vulnerability. It was published on October 1, 2026 and has a CVSS 3.1 base score of 7.4 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.4, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/ardatan/graphql-tools/commit/3831a0661514c91d99971052f983552556880402GitHubgithub.com/ardatan/graphql-tools/pull/8426GitHubgithub.com/ardatan/graphql-tools/releases/tag/@graphql-tools/[email protected]GitHubgithub.com/ardatan/graphql-tools/security/advisories/GHSA-6fw5-9hq8-w87g

How CyberStrike helps

Frequently asked questions

What is CVE-2026-103921?

CVE-2026-103921 is a high-severity vulnerability. It was published on October 1, 2026 and has a CVSS 3.1 base score of 7.4 (HIGH).

How severe is CVE-2026-103921?

This vulnerability has a CVSS 3.1 base score of 7.4, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-103921?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-103921?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-103921 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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