ChilliCream graphql-platform up to 12.22.6/13.9.15/14.3.0/15.1.13 recursion

Summaryinfo

A vulnerability categorized as critical has been discovered in ChilliCream graphql-platform up to 12.22.6/13.9.15/14.3.0/15.1.13. This issue affects some unknown processing. Such manipulation leads to recursion. This vulnerability is uniquely identified as CVE-2026-40324. The attack can be launched remotely. No exploit exists. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in ChilliCream graphql-platform up to 12.22.6/13.9.15/14.3.0/15.1.13 and classified as critical. Affected by this issue is an unknown functionality. The manipulation with an unknown input leads to a recursion vulnerability. Using CWE to declare the problem leads to CWE-674. The product does not properly control the amount of recursion that takes place, consuming excessive resources, such as allocated memory or the program stack. Impacted is confidentiality, integrity, and availability. CVE summarizes:

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 `Utf8GraphQLParser` has no recursion depth limit. A crafted GraphQL document with deeply nested selection sets, object values, list values, or list types can trigger a `StackOverflowException` on payloads as small as 40 KB. Because `StackOverflowException` is uncatchable in .NET (since .NET 2.0), the entire worker process is terminated immediately. All in-flight HTTP requests, background `IHostedService` 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 — `MaxExecutionDepth`, complexity analyzers, persisted query allow-lists, and custom `IDocumentValidatorRule` implementations cannot intercept the crash because `Utf8GraphQLParser.Parse` is invoked before validation. The `MaxAllowedFields=2048` 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 `MaxAllowedRecursionDepth` option to `ParserOptions` with a safe default, and enforces it across all recursive parser methods (`ParseSelectionSet`, `ParseValueLiteral`, `ParseObject`, `ParseList`, `ParseTypeReference`, etc.). When the limit is exceeded, a catchable `SyntaxException` is thrown instead of overflowing the stack. There is no application-level workaround. `StackOverflowException` 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).

The advisory is available at github.com. This vulnerability is handled as CVE-2026-40324 since 04/10/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. The technical details are unknown and an exploit is not available. This vulnerability is assigned to T1499 by the MITRE ATT&CK project.

Upgrading to version 12.22.7, 13.9.16, 14.3.1 or 15.1.14 eliminates this vulnerability. The upgrade is hosted for download at github.com. Applying the patch 08c0caa42ca33c121bbed49d2db892e5bf6fb541 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

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Productinfo

Vendor

• ChilliCream

Name

• graphql-platform

Version

• 12.22.0
• 12.22.1
• 12.22.2
• 12.22.3
• 12.22.4
• 12.22.5
• 12.22.6
• 13.9.0
• 13.9.1
• 13.9.2
• 13.9.3
• 13.9.4
• 13.9.5
• 13.9.6
• 13.9.7
• 13.9.8
• 13.9.9
• 13.9.10
• 13.9.11
• 13.9.12
• 13.9.13
• 13.9.14
• 13.9.15
• 14.0
• 14.1
• 14.2
• 14.3.0
• 15.1.0
• 15.1.1
• 15.1.2
• 15.1.3
• 15.1.4
• 15.1.5
• 15.1.6
• 15.1.7
• 15.1.8
• 15.1.9
• 15.1.10
• 15.1.11
• 15.1.12
• 15.1.13

License

• open-source

Website

• Product: https://github.com/ChilliCream/graphql-platform/

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