openSUSE-SU-2026:21191-1

Описание

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.

Затронутые продукты

Ссылки

• https://www.suse.com/security/cve/CVE-2026-49851.html
  CVE-2026-49851
• https://bugzilla.suse.com/1269091
  SUSE Bug 1269091