Streamdown built on harden-react-markdown implements quadruple security protection: XSS filtering layer to whitelist all HTML tags, SSR protection layer to block the risk of server-side injection, AST sanitization layer to remove suspicious syntactic structures, and content sandbox to isolate third-party plugins from the execution environment. The architecture has been tested against OWASP Top 10 standards and specifically guards against malicious markup that may be contained in AI-generated content.
In practice, the component can 100% intercept abnormal Markdown fragments containing JavaScript injection, while the format retention rate of legal content still reaches 99.6%. Its security model has been certified by CNCF security certification, and it has become the first Markdown rendering component to pass the certification.
This answer comes from the articleStreamdown: A Markdown Renderer Designed for AI Streaming ResponsivenessThe
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