CVE-2026-59927

MediumCVSS 5.3/10Last modified Oct 25, 2026

Description

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.

Metrics

CVSS 3.1 5.3/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Weakness enumeration

CWE-674 CWE-755

Affected software

No affected versions have been published.

Timeline

Published: Jul 8, 2026
Last modified: Oct 25, 2026
NVD status: Analyzed

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