CVE-2026-104852

The record

GraphQL Tools provides utilities for building, stitching, and mocking GraphQL schemas. Prior to 12.0.1, the GraphQL Tools utils package's mergeDeep function follows inherited properties while recursively merging source objects and does not exclude __proto__, constructor, or prototype keys. An unauthenticated GraphQL client can alias fields to those names so responses from two subgraphs collide during ordinary supergraph result merging, causing mergeDeep to traverse Object and Function prototypes and overwrite Function.prototype.call with a subgraph-supplied value. This breaks subsequent requests in the process until restart. This issue is fixed in version 12.0.1.

Affected packages

Related vulnerabilities

• CVE-2026-104849 Tinypool is a minimal Node.js worker thread pool implementation. CWE-1321
• CVE-2026-104848 Tinypool is a minimal Node.js worker thread pool implementation. CWE-1321
• CVE-2026-104183 stream-json is a micro-library of stream components for processing JSON and JSONC with a… CWE-1321
• CVE-2026-102992 piscina is a node.js worker pool implementation. CWE-1321
• CVE-2026-101908 Axios is a promise-based HTTP client for the browser and Node.js. CWE-1321
• CVE-2026-101909 Axios is a promise-based HTTP client for the browser and Node.js. CWE-1321
• CVE-2026-101902 Axios is a promise-based HTTP client for the browser and Node.js. CWE-1321
• CVE-2026-101904 Axios is a promise-based HTTP client for the browser and Node.js. CWE-1321