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Mermaid Architecture diagrams are vulnerable to prototype pollution

🗓️ 06 Aug 2026 19:51:59Reported by GitHub Advisory DatabaseType 
github
 github
🔗 github.com👁 3 Views

Rendering an untrusted architecture-beta diagram lets the diagram author write an arbitrary property with the value horizontal or vertical onto Object.prototype. A group id of __proto__ is accepted as a valid parent. Impact Any code in the same re...

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06 Aug 2026 19:52Current
6Medium risk
Vulners AI Score6
CVSS 46.5
3