cvedb.io
CVE-2026-40476
HIGH · CVSS 7.5
EPSS exploitation probability: 0%
Published 2026-04-17T22:16:33.360 · Last modified 2026-06-17T10:45:20.843

Summary

graphql-go is a Go implementation of GraphQL. In versions 15.31.4 and below, the OverlappingFieldsCanBeMerged validation rule performs O(n²) pairwise comparisons of fields sharing the same response name. An attacker can send a query with thousands of repeated identical fields, causing excessive CPU usage during validation before execution begins. This is not mitigated by existing QueryDepth or QueryComplexity rules. This issue has been fixed in version 15.31.5.

Affected products

webonyx — graphql-php

Does this affect you?

Add your gear to cvedb and we'll alert you only when webonyx ships something exploited.

Check my exposure →

References

This product uses data from the NVD API but is not endorsed or certified by the NVD. Informational only; not professional security advice.