VDB
CVE-2026-59929
CVE-2026-59929
PUBLISHED
CVSS 6.1 MEDIUM
Reported by GitHub_M · Published July 8, 2026
Mistune is a Python Markdown parser with renderers and plugins. Prior to 3.3.0, the safe_url filter in src/mistune/renderers/html.py blocks only javascript:, vbscript:, file:, and data: schemes, allowing legacy or chained schemes such as feed:, view-source:, jar:, livescript:, mocha:, ms-its:, mk:, and res: to reach rendered href and src attributes and potentially execute script in affected user agents. This issue is fixed in version 3.3.0.
Risk Scores
CVSS 3.1
6.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| lepture | mistune | < 3.3.0 |
| lepture | mistune | < 3.3.0, < 3.3.0 |
Timeline
- Jul 8, 2026 CVE Published
- Jul 9, 2026 EPSS Score
- Jul 9, 2026 Coalition ESS Score
- Jul 9, 2026 CVE Updated
- Aug 7, 2026 EPSS Score
References
- https://github.com/lepture/mistune/security/advisories/GHSA-qfrw-5rxm-mhh2 x_refsource_CONFIRM
- https://github.com/lepture/mistune/commit/c7101fcbb6e8790e8e39157c5ca2238fc6dd6cbc x_refsource_MISC
- https://github.com/lepture/mistune/releases/tag/v3.3.0 x_refsource_MISC