Amazon Linux 2023 Security Advisory: ALAS2023-2026-1492
Advisory Released Date: 2026-03-25
Advisory Updated Date: 2026-03-25
Severity:
Important
Issue Overview:
Python-Markdown version 3.8 contain a vulnerability where malformed HTML-like sequences can cause html.parser.HTMLParser to raise an unhandled AssertionError during Markdown parsing. Because Python-Markdown does not catch this exception, any application that processes attacker-controlled Markdown may crash. This enables remote, unauthenticated Denial of Service in web applications, documentation systems, CI/CD pipelines, and any service that renders untrusted Markdown. The issue was acknowledged by the vendor and fixed in version 3.8.1. This issue causes a remote Denial of Service in any application parsing untrusted Markdown, and can lead to Information Disclosure through uncaught exceptions. (CVE-2025-69534)
Affected Packages:
python-markdown
Issue Correction:
Run dnf update python-markdown --releasever 2023.10.20260316 or dnf update --advisory ALAS2023-2026-1492 --releasever 2023.10.20260316 to update your system.
More information on how to update your system can be found on this page: Amazon Linux 2023 documentation
New Packages:
noarch:
python3-markdown-3.3.4-2.amzn2023.0.4.noarch
src:
python-markdown-3.3.4-2.amzn2023.0.4.src