CVE-2026-104852: high-severity vulnerability in ardatan graphql-tools
GraphQL Tools has prototype pollution in well-established utility function `mergeDeep`
Published · Updated
21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 8.2epss 0.4%
exploitation probability
0.4%top 73% of all CVEs
observed exploitation
nono source reports it
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:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Affected products
ardatan · graphql-toolsRelated CVEs — ardatan graphql-tools
In the same product, most dangerous first.
References
https://github.com/ardatan/graphql-tools/commit/0b9529f1988fd36186a7c106a6efe0356f1b7f2ehttps://github.com/ardatan/graphql-tools/pull/8423https://github.com/ardatan/graphql-tools/releases/tag/@graphql-tools/utils@12.0.1https://github.com/ardatan/graphql-tools/security/advisories/GHSA-7mx3-vvmw-hjmvhttps://github.com/graphql-hive/gateway/pull/2600