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Mistune Project

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medium advisory

Mistune Markdown Parser Vulnerability CVE-2026-59930 Allows HTML ID Collision

A vulnerability, CVE-2026-59930, in the Mistune markdown parser's TableOfContents directive creates predictable HTML heading IDs, enabling an attacker to inject content with colliding IDs for client-side content manipulation.

Mistune vulnerability markdown client-side cve
1c