CVE-2026-59930
Medium · 4.3CVSS
4.3
EPSS
0.2%
Published
Jul 8, 2026
CISA due date
—
The record
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 packages
| Ecosystem | Package | Introduced | Fixed |
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