VULNERABILITY INTELLIGENCE

CVE-2026-59927

CVSS score5.3 MEDIUM

EPSS probability0.53%

CISA KEVNot currently listed

Published2026-07-08

Last modified2026-10-25

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

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.

Weakness classification

security-advisories@github.com: CWE-674
nvd@nist.gov: CWE-674

Primary references

security-advisories@github.com — Patch
security-advisories@github.com — Release Notes
security-advisories@github.com — Exploit, Third Party Advisory