VDB
CVE-2026-59926
CVE-2026-59926
PUBLISHED
CVSS 5.3 MEDIUM
Reported by GitHub_M · Published July 8, 2026
Mistune is a Python Markdown parser with renderers and plugins. Prior to 3.2.1, render_admonition() in src/mistune/directives/admonition.py concatenates the Admonition directive :class: option into the HTML class attribute without escaping, allowing attribute injection and cross-site scripting even when HTMLRenderer escape mode is enabled. This issue is fixed in version 3.2.1.
Risk Scores
CVSS 4.0
5.3
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| lepture | mistune | < 3.2.1 |
| lepture | mistune | < 3.2.1 |
Timeline
- Jul 8, 2026 CVE Published
- Jul 8, 2026 CVE Updated
- Jul 9, 2026 EPSS Score
- Jul 9, 2026 Coalition ESS Score
- Aug 7, 2026 EPSS Score
References
- https://github.com/lepture/mistune/security/advisories/GHSA-g97x-gvcm-x72h x_refsource_CONFIRM
- https://github.com/lepture/mistune/commit/a3cb6e5655308797e8be021d6c7b5bab13cbace2 x_refsource_MISC
- https://github.com/lepture/mistune/releases/tag/v3.2.1 x_refsource_MISC