CVE•Published 2026-04-17•Modified 2026-05-21•0 articles on news•6 live references•NVD data

CVE-2026-40476Webonyx · Graphql-php

Vulnerability data via NVD (ingested)

CVSS v3.1

7.5

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS percentile

Exploit Prediction Scoring System · top 92% of all CVEs

Weaknesses (CWE)

CWE-407Inefficient Algorithmic Complexity

Description

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.

Timeline

Published 2026-04-17

Modified 2026-05-21

External references

NVD MITRE Exploit-DB GitHub PoC Sploitus VulnCheck

Search for exposed instances

Shodan + Censys queries derived from NVD's CPE data. The vuln tag catches assets Shodan has explicitly linked to this CVE; the product / banner fingerprints find exposed instances even when the vuln tag was never applied (which is common).

Shodan · vuln tag0 hosts

vuln:CVE-2026-40476

Hosts Shodan has explicitly fingerprinted as vulnerable.

Shodan · product

product:"Webonyx Graphql-php"

All exposed Webonyx Graphql-php instances — cross-reference with the CVE's affected-version range.

Shodan · banner/body mention

http.html:"Graphql-php"

HTTP body or banner mentions "Graphql-php" — catches deploys Shodan didn't identify as a product.

More intel sources (5)

Shodan report

vuln:CVE-2026-40476