CVE-2026-59930

MediumCVSS 4.3/10Last modified Oct 25, 2026

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.

Metrics

CVSS 3.1 4.3/10CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N

Weakness enumeration

CWE-345 CWE-1284

Affected software

Vendor	Product	Versions
lepture	mistune	< 3.3.0

References

https://github.com/lepture/mistune/commit/c4093c4742ed0d10d9332fb8edb455869b7b581bPatch
https://github.com/lepture/mistune/releases/tag/v3.3.0Release Notes
https://github.com/lepture/mistune/security/advisories/GHSA-2hm2-hc3v-44h9Exploit, Third Party Advisory
https://github.com/lepture/mistune/security/advisories/GHSA-2hm2-hc3v-44h9Exploit, Third Party Advisory

Timeline

Published: Jul 8, 2026
Last modified: Oct 25, 2026
NVD status: Analyzed

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