6.1
Medium
CVE-2026-59923 Mistune is a Python Markdown parser with renderers and plugins
Description
Mistune is a Python Markdown parser with renderers and plugins. Prior to 3.3.0, HTMLRenderer.safe_url() does not block percent-encoded javascript URIs, allowing attacker-supplied Markdown links or images to bypass URL protections and execute script in rendered HTML. This issue is fixed in version 3.3.0.
Affected products and versions
| Product | Affected versions | Fixed in |
|---|---|---|
| mistune 3.3 | earliest → < 3.3.0 | 3.3.0 |
Other CVEs of mistune
The 28 CVEs of mistune →
CVE-2026-121437
Mistune from 3.3.0 before 3.3.4 contains a denial of service vulnerability that allows remote attackers to exhaust CPU…
8.7
High
CVE-2026-121438
Mistune before 3.3.3 Denial of Service via Balanced Bracket Link Parsing
6.9
Medium
CVE-2026-115354
Mistune before 3.3.0 contains a path traversal vulnerability in the opt-in Include directive that allows attackers to…
7.1
High
CVE-2026-115355
Mistune before 3.3.0 contains a path traversal vulnerability in the Include directive that allows attackers to read…
8.7
High