Amazon Linux 2027 Preview Security Advisory: ALAS2027-2026-077
Advisory Released Date: 2026-09-28
Advisory Updated Date: 2026-11-02
Severity:
Important
Issue Overview:
Mistune is a Python Markdown parser with renderers and plugins. Versions 3.3.0 through 3.3.2 are vulnerable to DoS through deeply nested tokens. HTML rendering creates deeply nested emphasis tokens from consecutive asterisk characters, and recursive rendering in HTMLRenderer.render_token() can exceed Python's recursion limit and raise RecursionError, allowing crafted Markdown to crash a parsing process. This issue is fixed in version 3.3.3 (CVE-2026-76098)
Affected Packages:
python-mistune
Issue Correction:
Run dnf update python-mistune --releasever 2027.0.20260928 or dnf update --advisory ALAS2027-2026-077 --releasever 2027.0.20260928 to update your system.
New Packages:
noarch:
python3-mistune-3.3.0-1.amzn2027.0.2.noarch
src:
python-mistune-3.3.0-1.amzn2027.0.2.src