Patch Forecast
Amber warning
Patch this week.

CVE-2026-104852 · GHSA-7mx3-vvmw-hjmv

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

Risk score
65/100
CVSS
8.2 v4.0
Exploit chance (30 days)
0.4%
Published
5 Oct 2026

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What to know

What it is
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 c…
Affected
@graphql-tools/utils (npm) <= 12.0.0
Fix
Upgrade @graphql-tools/utils to 12.0.1 or later.
Exploitation
No known exploitation

Story map

Story map: @graphql-tools/utilsTHE FLAWSTHE FIXCVE-2026-104852GraphQL Tools has prototypepollution in well-establishedutility function `mergeDeep`CVSS 8.2 · EPSS 0%CVE-2026-114604GraphQL Tools: Prototypepollution inmergeIncrementalResult via…CVSS 8.4Upgrade @graphql-tools/utils12.0.1or later on your release lineWho is exposed@graphql-tools/utils (npm) <=12.0.0AMBER · PATCH THIS WEEK@graphql-tools/utilsGraphQL Tools provides utilitiesfor building, stitching, andmocking GraphQL schemas. Priorto 12.0.1, the GraphQL Tools utilspackage's mergeDeep functionfollows inherited propertieswhile recursively merging…Where it standsNo known exploitationCONNECTS TOSame weaknessPrototype pollution (CWE-1321)39 other warnings in 30 days →
Story map: the flaws, the fix, how it unfolded and what it connects to. Boxes link to the record or article.

At a glance

@graphql-tools/utils: Amber, patch this week. 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 c…

The flaws

  • CVE-2026-104852: GraphQL Tools has prototype pollution in well-established utility function `mergeDeep` (CVSS 8.2 · EPSS 0%)
  • CVE-2026-114604: GraphQL Tools: Prototype pollution in mergeIncrementalResult via non-primitive path segments (CVSS 8.4)

The fix

Upgrade @graphql-tools/utils: 12.0.1 or later on your release line

Who is exposed: @graphql-tools/utils (npm) <= 12.0.0

Where it stands

  • No known exploitation

Connects to

Why it is Amber

  • CVSS 8.2 high
  • Remotely exploitable without logging in
  • On your watchlist: npm

Affected packages

PackageEcosystemVulnerableFixed in
@graphql-tools/utilsnpm<= 12.0.012.0.1

References

Original description

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.

Last activity 5 Oct 2026. Patch Forecast updates every hour.