This page tracks the Debian fix status. The vulnerability itself is described on the main CVE page. View CVE-2026-59930 →

DEBIAN-CVE-2026-59930

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 p...

Original description

The description as published by the source.

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.

Source: OSV.dev (Open Source Vulnerabilities) OSV

Affected packages

Debian:12 mistune

[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]

Debian:13 mistune

[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]

Debian:14 mistune

[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]

References

advisory security-tracker.debian.org