CVE-2026-59930Mistune toc / TableOfContents directive: heading IDs use predictable `toc_N` numbering with no slugification, allowing collision with attacker-controlled `id="toc_N"` content

Descripción

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.

Datos: CVE.org, NVD, CISA KEV, FIRST EPSS, Ubuntu. Se publican tal como los indican las fuentes, en inglés.

Productos y versiones afectados

Referencias y parches

• https://github.com/lepture/mistune/security/advisories/GHSA-2hm2-hc3v-44h9 ExploitThird Party Advisory
• https://github.com/lepture/mistune/commit/c4093c4742ed0d10d9332fb8edb455869b7b581b Patch
• https://github.com/lepture/mistune/releases/tag/v3.3.0 Release Notes