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 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.

CVSS

No CVSS.

References

Link	Resource
https://github.com/ardatan/graphql-tools/commit/0b9529f1988fd36186a7c106a6efe0356f1b7f2e
https://github.com/ardatan/graphql-tools/pull/8423
https://github.com/ardatan/graphql-tools/releases/tag/@graphql-tools/utils@12.0.1
https://github.com/ardatan/graphql-tools/security/advisories/GHSA-7mx3-vvmw-hjmv
https://github.com/graphql-hive/gateway/pull/2600

Configurations

No configuration.

History

05 Oct 2026, 23:17

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-10-05 23:17

Updated : 2026-10-06 15:17

NVD link : CVE-2026-104852

Mitre link : CVE-2026-104852

CVE.ORG link : CVE-2026-104852

JSON object : View

Products Affected

No product.

CWE

CWE-1321

Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')

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