ardatan GraphQL Tools up to 12.0.0 Utils mergeDeep prototype pollution

Summaryinfo

A vulnerability categorized as critical has been discovered in ardatan GraphQL Tools up to 12.0.0. The affected element is the function mergeDeep of the component Utils. Executing a manipulation can lead to prototype pollution. This vulnerability appears as CVE-2026-104852. The attack may be performed from remote. There is no available exploit. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability classified as critical was found in ardatan GraphQL Tools up to 12.0.0. This vulnerability affects the function mergeDeep of the component Utils. The manipulation with an unknown input leads to a prototype pollution vulnerability. The CWE definition for the vulnerability is CWE-1321. The product receives input from an upstream component that specifies attributes that are to be initialized or updated in an object, but it does not properly control modifications of attributes of the object prototype. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is shared for download at github.com. This vulnerability was named CVE-2026-104852 since 10/02/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1059.

Upgrading to version 12.0.1 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-92849). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Vendor

• ardatan

Name

• GraphQL Tools

Version

• 12.0

CPE 2.3info

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CPE 2.2info

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VulDB is the best source for vulnerability data and more expert information about this specific topic.

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