CVE-2026-104852
Published:October 05, 2026
Updated:October 08, 2026
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
https://github.com/ardatan/graphql-tools.git (GITHUB):
Affected version(s) =@graphql-tools/utils@12.0.0 <@graphql-tools/utils@12.0.1Fix Suggestion:
Update to version @graphql-tools/utils@12.0.1@graphql-tools/utils (NPM):
Affected version(s) >=12.0.0-alpha-20260805121238-f73ffd0c8126377e841d94b8bb2db97f34af4c41 <12.0.1Fix Suggestion:
Update to version 12.0.1Additional Notes
The description of this vulnerability differs from MITRE.
Related Resources (8)
Do you need more information?
Contact UsCVSS v4
Base Score:
8.2
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
PRESENT
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
NONE
Vulnerable System Availability
HIGH
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
7.5
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Weakness Type (CWE)
Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')
EPSS
Base Score:
0.36