CVE-2026-40324Network attack vector

Process termination via unbounded parser recursion

Published Apr 17, 2026 · Updated Apr 17, 2026

Uncontrolled recursion in Hot Chocolate allows remote attackers to terminate GraphQL server workers with deeply nested documents. Affected releases lack a depth check in Utf8GraphQLParser, which recursively parses nested selection sets, object and list values, and list types until the .NET stack overflows. An unauthenticated GraphQL request reaches parsing before validation, immediately terminating the worker and dropping requests, background tasks, and WebSocket subscriptions.

CVSS severity9.1
Critical
EPSS probability0.90%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Uncontrolled recursion in Hot Chocolate allows remote attackers to terminate GraphQL server workers with deeply nested documents. Affected releases lack a depth check in Utf8GraphQLParser, which recursively parses nested selection sets, object and list values, and list types until the .NET stack overflows. An unauthenticated GraphQL request reaches parsing before validation, immediately terminating the worker and dropping requests, background tasks, and WebSocket subscriptions.

The record

CVE
CVE-2026-40324
Published
Apr 17, 2026
Updated
Apr 17, 2026
Vendor
ChilliCream
Product
ChilliCream GraphQL Platform
Classifications
CWE-674, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 17, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 17, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 12.22.7
  2. Affected versionversion=>= 13.0.0, < 13.9.16
  3. Affected versionversion=>= 14.0.0, < 14.3.1
  4. Affected versionversion=>= 15.0.0, < 15.1.14

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

ChilliCream · ChilliCream GraphQL Platformversion=< 12.22.7; version=>= 13.0.0, < 13.9.16; version=>= 14.0.0, < 14.3.1; version=>= 15.0.0, < 15.1.14

Published CVSS scores

9.1GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-674Uncontrolled Recursion
T1499.004Endpoint Denial of Service: Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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