4.3
Medium
CVE-2026-59930 Mistune is a Python Markdown parser with renderers and plugins
Description
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 products and versions
| Product | Affected versions | Fixed in |
|---|---|---|
| mistune 3.3 | earliest → < 3.3.0 | 3.3.0 |
References
- github.com github.com
- github.com github.com
- github.com github.com
Timeline
- Published
- Last modified
Other CVEs of mistune
The 28 CVEs of mistune →
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CVE-2026-115355
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8.7
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