Uncontrolled Recursion Affecting mistune package, versions *


Severity

Recommended
low

Based on default assessment until relevant scores are available.

Threat Intelligence

EPSS
0.53% (43rd percentile)

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  • Snyk IDSNYK-ECHOLATEST-MISTUNE-18306996
  • published25 Jul 2026
  • disclosed8 Jul 2026

Introduced: 8 Jul 2026

CVE-2026-59927  (opens in a new tab)
CWE-674  (opens in a new tab)
CWE-755  (opens in a new tab)

How to fix?

There is no fixed version for Echo:latest mistune.

NVD Description

Note: Versions mentioned in the description apply only to the upstream mistune package and not the mistune package as distributed by Echo. See How to fix? for Echo:latest relevant fixed versions and status.

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.

CVSS Base Scores

version 3.1