CVE-2026-59930
4.3
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
Summary
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 Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| lepture | mistune | < 3.3.0 | affected |
Weaknesses
- CWE-345: CWE-345: Insufficient Verification of Data Authenticity
- CWE-1284: CWE-1284: Improper Validation of Specified Quantity in Input
References
- https://github.com/lepture/mistune/security/advisories/GHSA-2hm2-hc3v-44h9
- https://github.com/lepture/mistune/commit/c4093c4742ed0d10d9332fb8edb455869b7b581b
- https://github.com/lepture/mistune/releases/tag/v3.3.0
Feedback
Was this page helpful?
Glad to hear it! Please tell us how we can improve.
Sorry to hear that. Please tell us how we can improve.