Mistune: XSS via unescaped class option in Admonition directive

Description

References

• lepture/mistune security advisory · WEB
• nvd.nist.gov/vuln/detail/CVE-2026-59926 · ADVISORY
• lepture/mistune commit a3cb6e5 · WEB
• lepture/mistune · PACKAGE
• lepture/mistune release v3.2.1 · WEB
• pypa/advisory-database · WEB

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