# Mermaid XY Charts are vulnerable to an infinite loop DoS

Advisory record · `GHSA-2v8p-3f2j-5mp7`

- **Identifiers:** `GHSA-2v8p-3f2j-5mp7` · `CVE-2026-71436`
- **State:** Confirmed
- **Severity:** CVSS 5.3 Medium
- **Critical:** No
- **Weakness (CWE):** [CWE-835](https://cwe.mitre.org/data/definitions/835.html) · [CWE-1325](https://cwe.mitre.org/data/definitions/1325.html)
- **Tags:** [Denial of service](https://agentprime.io/advisories/tag/dos.md) · [CWE-1325](https://agentprime.io/advisories/tag/cwe-1325.md)
- **Published:** 6 Aug 2026
- **Updated:** 10 Sept 2026
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 6 Aug 2026, 19:49 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Affected packages

- `mermaid` (npm): affected `>=10.6.0, <10.9.8 || >=11.0.0-alpha.1, <11.16.1`; fixed in `10.9.8`, `11.16.1`

## 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

- 5.3 Medium, CVSS 4.0: `CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:L`, from CNA (GitHub_M)

- **CISA KEV:** Not listed.
- **EPSS:** 0.0058, the 47th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

This record came from the full history of the GitHub Advisory Database, published 6 Aug 2026. New records show when each source confirmed them.

## Sources

- [GitHub Advisory Database: GHSA-2v8p-3f2j-5mp7](https://github.com/advisories/GHSA-2v8p-3f2j-5mp7)
- [OSV: GHSA-2v8p-3f2j-5mp7](https://osv.dev/vulnerability/GHSA-2v8p-3f2j-5mp7)
- <https://github.com/mermaid-js/mermaid/security/advisories/GHSA-2v8p-3f2j-5mp7>
- <https://github.com/mermaid-js/mermaid/pull/8022>
- <https://github.com/mermaid-js/mermaid/commit/630aa7e5dd417e1f56bff2a1ce8df2c5ad08d289>
- <https://github.com/mermaid-js/mermaid/commit/ef60adc837d9d5107af21285f01e83dea309bd0a>
- <https://github.com/mermaid-js/mermaid>
- <https://github.com/mermaid-js/mermaid/releases/tag/mermaid@11.16.1>
- <https://github.com/mermaid-js/mermaid/releases/tag/v10.9.8>

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-2v8p-3f2j-5mp7>, 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-2v8p-3f2j-5mp7/>. Everything for agents: <https://agentprime.io/llms.txt>.