Bug 2498150 (CVE-2026-59930) - CVE-2026-59930 mistune: Mistune: Same-page navigation redirection due to predictable heading IDs
Summary: CVE-2026-59930 mistune: Mistune: Same-page navigation redirection due to pred...
Keywords:
Status: NEW
Alias: CVE-2026-59930
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 2498563 2498564
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-07-08 17:02 UTC by OSIDB Bzimport
Modified: 2026-07-10 11:22 UTC (History)
13 users (show)

Fixed In Version:
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Description OSIDB Bzimport 2026-07-08 17:02:08 UTC 
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.
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