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Vulnerabilities

Vulnerability · CVE-2026-40324

Hot Chocolate is an open-source GraphQL server.

Published Apr 18, 2026 · catalog updated Jun 17, 2026 · Hot Chocolate is an

Check if you run it

No confirmed exploitation is on record for CVE-2026-40324. EPSS is 1.05%. Act only if a listed version of Hot Chocolate is an is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (Hot Chocolate is an).
  • No version range is stored. A customer cannot check an installed version against this record.
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Critical9.1
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
1.05%
Remediation
Not established
Affected products
See sources for product scope

Hot Chocolate is an open-source GraphQL server. Prior to versions 12.22.7, 13.9.16, 14.3.1, and 15.1.14, Hot Chocolate's recursive descent parser has no recursion depth limit. A crafted GraphQL document with deeply nested selection sets, object values, list values, or list types can trigger a on payloads as small as 40 KB. Because is uncatchable in .NET (since .NET 2.0), the entire worker process is terminated immediately. All in-flight HTTP requests, background tasks, and open WebSocket subscriptions on that worker are dropped. The orchestrator (Kubernetes, IIS, etc.) must restart the process. This occurs before any validation rules run — , complexity analyzers, persisted query allow-lists, and custom implementations cannot intercept the crash because is invoked before validation. The limit does not help because the crashing payloads contain very few fields. The fix in versions 12.22.7, 13.9.16, 14.3.1, and 15.1.14 adds a option to with a safe default, and enforces it across all recursive parser methods ( , , , , , etc.). When the limit is exceeded, a catchable is thrown instead of overflowing the stack. There is no application-level workaround. cannot be caught in .NET. The only mitigation is to upgrade to a patched version. Operators can reduce (but not eliminate) risk by limiting HTTP request body size at the reverse proxy or load balancer layer, though the smallest crashing payload (40 KB) is well below most default body size limits and is highly compressible (~few hundred bytes via gzip).

No affected version ranges are stored yet. Use the vendor advisory before you decide this record does not apply.

How to fix CVE-2026-40324

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-40324. EPSS is 1.05%. Act only if a listed version of Hot Chocolate is an is installed.

Which versions are affected?

Affected version ranges are not on this record. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-674. EPSS 1.05%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Apr 18, 2026 · NIST NVD

    Detected

    Hot Chocolate is an open-source GraphQL server. Prior to versions 12.22.7, 13.9.16, 14.3.1, and 15.1.14, Hot Chocolate's recursive descent parser has no recursion depth limit. A crafted GraphQL document with deeply nested selection sets, object values, list values, or list types can trigger a on payloads as small as 40 KB. Because is uncatchable in .NET (since .NET 2.0), the entire worker process

  2. Jun 17, 2026 · NIST NVD

    Updated

    Hot Chocolate is an open-source GraphQL server. Prior to versions 12.22.7, 13.9.16, 14.3.1, and 15.1.14, Hot Chocolate's recursive descent parser has no recursion depth limit. A crafted GraphQL document with deeply nested selection sets, object values, list values, or list types can trigger a on payloads as small as 40 KB. Because is uncatchable in .NET (since .NET 2.0), the entire worker process

Sources

  • CVE.orgVulnerability recordCVE-2026-40324

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-40324

    30-day exploitation probability 1.0%

    first.org
  • NIST NVDVulnerability recordCVE-2026-40324

    Hot Chocolate is an open-source GraphQL server. Prior to versions 12.22.7, 13.9.16, 14.3.1, and 15.1.14, Hot Chocolate's recursive descent parser has no recursion depth limit. A crafted GraphQL document with deeply nested selection sets, object values, list va

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.