High 7.5Published Apr 17, 2026

CVE-2026-40476graphql-go is a Go implementation of GraphQL.

Updated under an hour ago (2026-10-19 11:20 UTC)

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It affects webonyx graphql-php. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

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.

CVSS: 7.5 HIGH (v3.1, NVD)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): CWE-407
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Not given
NVD analysis: Modified
Record last updated: Sep 14, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

webonyx graphql-php webonyx:graphql-php	before 15.31.5	NVD

References

https://github.com/webonyx/graphql-php/releases/tag/v15.31.5release-notes
https://github.com/webonyx/graphql-php/security/advisories/GHSA-68jq-c3rv-pcrrvendor-advisory
http://www.openwall.com/lists/oss-security/2026/09/14/26

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.