Prototype pollution vulnerability found in Mermaid's bundled version of DOMPurify
The following bundled files within the Mermaid NPM package contain a bundled version of DOMPurify that is vulnerable to https://github.com/cure53/DOMPurify/security/advisories/GHSA-mmhx-hmjr-r674, potentially resulting in an XSS attack.
This affects the built:
dist/mermaid.min.jsdist/mermaid.jsdist/mermaid.esm.mjsdist/mermaid.esm.min.mjs
This will also affect users that use the above files via a CDN link, e.g. https://cdn.jsdelivr.net/npm/mermaid@10.9.2/dist/mermaid.min.js
Users that use the default NPM export of mermaid, e.g. import mermaid from 'mermaid', or the dist/mermaid.core.mjs file, do not use this bundled version of DOMPurify, and can easily update using their package manager with something like npm audit fix.
Patches
developbranch: 6c785c93166c151d27d328ddf68a13d9d65adc00- backport to v10: 92a07ffe40aab2769dd1c3431b4eb5beac282b34
Affected software
Click a technology to see all vulnerabilities affecting it.
| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| npm package | mermaid | < 10.9.3 | 10.9.3 |
References
- 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
- CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:L- Weakness (CWE)
CWE-1321, CWE-1395- Platform
- npm
- Package
mermaid- Disclosed
- 22.10.2024
- Updated
- 11.10.2026 10:22
Sources and licenses
OSV / GitHub Advisory Database - GHSA-m4gq-x24j-jpmf - CC BY 4.0
Vulnerability history: mermaid
All published vulnerabilities of this package (npm package), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 16
- First → latest
- 09.2020 08.2026
- Without a fix
- 0
- Exploited in attacks
- 0
Severity breakdown
- High 3
- Medium 12
- Low 1
Disclosures per year
- 2020: 1
- 2021: 1
- 2022: 2
- 2023: 0
- 2024: 1
- 2025: 2
- 2026: 9
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Prototype pollution vulnerability found in Mermaid's bundled version of DOMPurify this entry
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