# ChilliCream GraphQL Platform: Utf8GraphQLParser Stack Overflow via Deeply Nested GraphQL Documents

Advisory record · `GHSA-qr3m-xw4c-jqw3`

- **Identifiers:** `GHSA-qr3m-xw4c-jqw3` · `CVE-2026-40324`
- **State:** Confirmed
- **Severity:** CVSS 9.1 Critical
- **Critical:** Yes: CVSS 9+
- **Weakness (CWE):** [CWE-674](https://cwe.mitre.org/data/definitions/674.html)
- **Tags:** [Denial of service](https://agentprime.io/advisories/tag/dos.md)
- **Published:** 16 Apr 2026
- **Updated:** 5 May 2026
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 16 Apr 2026, 21:09 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Critical

Critical, because:

- CVSS score 9.1: 9.0 or more.

How we decide what’s critical: <https://agentprime.io/advisories/critical.md>

## Affected packages

- `HotChocolate.Language` (NuGet): affected `<12.22.7 || >=13.0.0, <13.9.16 || >=14.0.0, <14.3.1 || >=15.0.0, <15.1.14`; fixed in `12.22.7`, `13.9.16`, `14.3.1`, `15.1.14`

## Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

## Severity and exploitation

- 9.1 Critical, CVSS 3.1: `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H`, from CNA (GitHub_M)

- **CISA KEV:** Not listed.
- **EPSS:** 0.0090, the 59th percentile, on 8 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

- 31 Oct 2026, 15:22 UTC: First seen by agentprime
- 31 Oct 2026, 15:22 UTC: [Confirmed by OSV](https://osv.dev/vulnerability/GHSA-qr3m-xw4c-jqw3)

## Sources

- [GitHub Advisory Database: GHSA-qr3m-xw4c-jqw3](https://github.com/advisories/GHSA-qr3m-xw4c-jqw3)
- [OSV: GHSA-qr3m-xw4c-jqw3](https://osv.dev/vulnerability/GHSA-qr3m-xw4c-jqw3)
- <https://github.com/ChilliCream/graphql-platform/security/advisories/GHSA-qr3m-xw4c-jqw3>
- <https://nvd.nist.gov/vuln/detail/CVE-2026-40324>
- <https://github.com/ChilliCream/graphql-platform/pull/9528>
- <https://github.com/ChilliCream/graphql-platform/pull/9530>
- <https://github.com/ChilliCream/graphql-platform/pull/9531>
- <https://github.com/ChilliCream/graphql-platform/commit/08c0caa42ca33c121bbed49d2db892e5bf6fb541>
- <https://github.com/ChilliCream/graphql-platform/commit/4cbaf67d366f800fc1e484bc5c06dfcf27b45023>
- <https://github.com/ChilliCream/graphql-platform/commit/b185eb276c9ee227bd44616ff113be7f01a66c69>
- <https://github.com/ChilliCream/graphql-platform/commit/b9271e6a500484c002fd528dcd34d1a9b445480f>
- <https://github.com/ChilliCream/graphql-platform>
- <https://github.com/ChilliCream/graphql-platform/releases/tag/12.22.7>
- <https://github.com/ChilliCream/graphql-platform/releases/tag/13.9.16>

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.

## Check whether this affects you

A Match means an installed version is in the affected range above. Most don’t affect the app; agentprime hasn’t analysed this one yet.

- With the agentprime MCP server (<https://api.agentprime.io/mcp>), ask your agent to check the project: `check_lockfile` sends a lockfile, `check_packages` a list of installed packages, and both return the Matches and the upgrades that clear them. `get_advisory` returns this record. Setup: <https://agentprime.io/mcp.md>
- In a browser: <https://agentprime.io/check/> reads your lockfile in the browser, never uploading it.
- Whether it touches your code, with file and line: the Claude Code plugin, <https://agentprime.io/plugin.md>
- As JSON: <https://api.agentprime.io/v1/advisories/GHSA-qr3m-xw4c-jqw3>, or `POST https://api.agentprime.io/v1/match` with your packages (<https://agentprime.io/api.md>)

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The web page: <https://agentprime.io/advisories/GHSA-qr3m-xw4c-jqw3/>. Everything for agents: <https://agentprime.io/llms.txt>.