CVE-2023-26144

Severity: medium (CVSS 5.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.5% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2023-09-20 · updated 2026-06-17
Weakness: CWE-400

Description

Versions of the package graphql from 16.3.0 and before 16.8.1 are vulnerable to Denial of Service (DoS) due to insufficient checks in the OverlappingFieldsCanBeMergedRule.ts file when parsing large queries. This vulnerability allows an attacker to degrade system performance. **Note:** It was not proven that this vulnerability can crash the process.

Affected products

graphql: from 16.3.0 before 16.8.1; 17.0.0-alpha1, 17.0.0-alpha2 — fixed in 16.8.1

How to fix

Upgrade to a fixed version: graphql 16.8.1. Check the vendor advisory for mitigations.

References

https://github.com/graphql/graphql-js/commit/f94b511386c7e47bd0380dcd56553dc063320226
https://github.com/graphql/graphql-js/issues/3955
https://github.com/graphql/graphql-js/pull/3972
https://github.com/graphql/graphql-js/releases/tag/v16.8.1
https://security.snyk.io/vuln/SNYK-JS-GRAPHQL-5905181
https://github.com/graphql/graphql-js/commit/f94b511386c7e47bd0380dcd56553dc063320226
https://github.com/graphql/graphql-js/issues/3955
https://github.com/graphql/graphql-js/pull/3972
https://github.com/graphql/graphql-js/releases/tag/v16.8.1
https://security.snyk.io/vuln/SNYK-JS-GRAPHQL-5905181

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