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TI-2026-29227 Aliases CVE-2026-40476GHSA-68jq-c3rv-pcrr

graphql-php: Denial of Service via quadratic complexity in OverlappingFieldsCanBeMerged validation

Priority LOW 37CWE-407Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · Low
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub. Impact type from CWE-407.

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00637 50th percentileScored 2026-11-07
Fix Fixed graphql-php (webonyx): 15.31.5webonyx/graphql-php (Packagist): 15.31.5

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
webonyxgraphql-phpbefore 15.31.515.31.5Patch availableCNA
—webonyx/graphql-php (Packagist)before 15.31.515.31.5Patch availableGHSA-68jq-c3rv-pcrr
  • graphql-php Vendorwebonyx Affected before 15.31.5 Fixed in 15.31.5 Patch available CNA
  • webonyx/graphql-php (Packagist) Vendor— Affected before 15.31.5 Fixed in 15.31.5 Patch available GHSA-68jq-c3rv-pcrr

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:webonyx:graphql-php:*:*:*:*:*:*:*:*before 15.31.5Vulnerablewebonyx
  • cpe:2.3:a:webonyx:graphql-php:*:*:*:*:*:*:*:* Versions before 15.31.5 Vulnerable ·webonyx

Remediation

  • Fix · CNA graphql-php (webonyx) Fixed in 15.31.5
  • Fix · GHSA-68jq-c3rv-pcrr webonyx/graphql-php (Packagist) Fixed in 15.31.5 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-40476
  2. 2026-10-03 Alias added: GHSA-68jq-c3rv-pcrr

References

Advisory 2

Other 2

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences