CVE-2026-104852

UNKNOWN 0.0

GraphQL Tools has prototype pollution in well-established utility function `mergeDeep`

CVSS Score

0.0

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-1321
Vendor	ardatan
Product	graphql-tools
Published	Oct 5, 2026

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Affected Versions

ardatan / graphql-tools

< 12.0.1

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/ardatan/graphql-tools/security/advisories/GHSA-7mx3-vvmw-hjmv github.com: https://github.com/ardatan/graphql-tools/pull/8423 github.com: https://github.com/graphql-hive/gateway/pull/2600 github.com: https://github.com/ardatan/graphql-tools/commit/0b9529f1988fd36186a7c106a6efe0356f1b7f2e github.com: https://github.com/ardatan/graphql-tools/releases/tag/@graphql-tools/[email protected]