CVE-2026-59927

Summary

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.

Affected Software

VendorProductVersion RangeStatus
lepturemistune< 3.3.0affected

Weaknesses

  • CWE-674: CWE-674: Uncontrolled Recursion
  • CWE-755: CWE-755: Improper Handling of Exceptional Conditions

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: yes
    • Technical Impact: partial

References