# Prototype pollution vulnerability found in Mermaid's bundled version of DOMPurify

Advisory record · `GHSA-m4gq-x24j-jpmf`

- **Identifiers:** `GHSA-m4gq-x24j-jpmf`
- **State:** Confirmed
- **Severity:** CVSS 7.0 High
- **Critical:** No
- **Weakness (CWE):** [CWE-1321](https://cwe.mitre.org/data/definitions/1321.html) · [CWE-1395](https://cwe.mitre.org/data/definitions/1395.html)
- **Tags:** [Prototype pollution](https://agentprime.io/advisories/tag/prototype-pollution.md) · [CWE-1395](https://agentprime.io/advisories/tag/cwe-1395.md)
- **Published:** 22 Oct 2024
- **Updated:** 23 Oct 2024
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 22 Oct 2024, 18:17 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Affected packages

- `mermaid` (npm): affected `<10.9.3`; fixed in `10.9.3`

## 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

- 7.0 High, CVSS 3.1: `CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:L`, from GitHub Advisory Database

- **CISA KEV:** Not listed.
- **EPSS:** No score.

## Timeline

This record came from the full history of the GitHub Advisory Database, published 22 Oct 2024. New records show when each source confirmed them.

## Sources

- [GitHub Advisory Database: GHSA-m4gq-x24j-jpmf](https://github.com/advisories/GHSA-m4gq-x24j-jpmf)
- [OSV: GHSA-m4gq-x24j-jpmf](https://osv.dev/vulnerability/GHSA-m4gq-x24j-jpmf)
- <https://github.com/cure53/DOMPurify/security/advisories/GHSA-mmhx-hmjr-r674>
- <https://github.com/mermaid-js/mermaid/security/advisories/GHSA-m4gq-x24j-jpmf>
- <https://github.com/mermaid-js/mermaid/commit/6c785c93166c151d27d328ddf68a13d9d65adc00>
- <https://github.com/mermaid-js/mermaid/commit/92a07ffe40aab2769dd1c3431b4eb5beac282b34>
- <https://github.com/mermaid-js/mermaid>

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-m4gq-x24j-jpmf>, 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-m4gq-x24j-jpmf/>. Everything for agents: <https://agentprime.io/llms.txt>.