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CVE-2026-59930

Mistune toc / TableOfContents directive: heading IDs use predictable `toc_N` numbering with no slugification, allowing collision with attacker-controlled `id="toc_N"` content PUBLISHED

Description (CNA)

Mistune is a Python Markdown parser with renderers and plugins. Prior to 3.3.0, the toc plugin and TableOfContents directive generate heading IDs as predictable toc_N values without slugifying the heading text, allowing attacker-controlled id="toc_N" content to collide with generated anchors and redirect same-page navigation, CSS selectors, or JavaScript handlers. This issue is fixed in version 3.3.0.

Affected (CNA)

Vendor / productVersions
lepture / mistuneaffected < 3.3.0

CWE

CWE-345, CWE-1284

References

ADP enrichment

CISA-ADP

No English description supplied.