CVE-2026-59927
Fixed in a distro release EPSS <1%CVSS 5.3
Mistune is a Python Markdown parser with renderers and plugins. Prior to 3.3.0, the Include directive in src/mistune/directives/include.py detects only direct self-includes and not indirect cycles, allowing two markdown files that include each other to trigger unbounded recursion, raise RecursionError, and crash the rendering request. This issue is fixed in version 3.3.0.
Products: lepture mistune
Fixed upstream
| Ecosystem | Package | Fixed in |
|---|---|---|
| PyPI | mistune | 3.3.0 |
Distro releases
| Release | Package | Fixed in |
|---|---|---|
| Debian 12 | mistune | no fix |
| Debian 13 | mistune | no fix |
| Debian 14 | mistune | no fix |
| SUSE Linux Enterprise Server 16.0 | python-mistune | 3.1.3-160000.5.1 |
| SUSE Linux Enterprise Server for SAP applications 16.0 | python-mistune | 3.1.3-160000.5.1 |
| Ubuntu 16.04 LTS | mistune | no fix |
| Ubuntu 18.04 LTS | mistune | no fix |
| Ubuntu 20.04 LTS | mistune | no fix |
| Ubuntu 22.04 LTS | mistune | no fix |
| Ubuntu 24.04 LTS | mistune | no fix |
| Ubuntu 25.10 | mistune | no fix |
| Ubuntu 26.04 LTS | mistune | no fix |
| Ubuntu 26.10 | mistune | no fix |
| openSUSE Leap 16.0 | python-mistune | 3.1.3-160000.5.1 |