CVE WatchOct 6, 2026

CVE-2026-104852

GraphQL Tools provides utilities for building, stitching, and mocking GraphQL schemas. Prior to 12.0.1, the GraphQL Tools utils package's me

CVSS

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No CVSS

EPSS

0.4%

p28

KEV

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Exploit Today

0-100

Published: Oct 5, 2026 · Last modified: Oct 6, 2026 · CWE-1321

EPSS · 30d

0.4%EPSS · 30 days0.4%

2026-10-062026-10-21

Technical description

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.

Official references

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