CVE-2026-49851

CVE-2026-49851 · Mistune: Potential DoS via quadratic-time parsing in parse_link_text

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Mistune is a Python Markdown parser with renderers and plugins. Prior to 3.3.0, Mistune is vulnerable to a CPU exhaustion DoS due to superlinear (approximately O(n²)) behavior in parse_link_text. When parsing Markdown containing many consecutive [ characters, parse_link_text repeatedly scans the input using a regex search inside a loop. Each iteration re-scans a large portion of the remaining string, resulting in quadratic-time behavior. An attacker-controlled Markdown input can therefore trigger excessive CPU usage with a very small payload. This vulnerability is fixed in 3.3.0.

CVSS 8.7 · Высокий · EPSS 0,5% · Есть исправление

Опубликовано

2026-06-24T17:05:33.602Z

Обновлено

2026-08-28T12:04:23.106Z

Стек: system · python

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