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OpenAdvisories
High ALAS2023-2026-2148 1 CVE

Important: python-mistune security update (Amazon Linux 2023)

Published Sep 14, 2026 · Updated Sep 14, 2026

Ecosystem: Amazon Linux

Summary

Package updates are available for Amazon Linux 2023 that fix the following vulnerabilities: CVE-2026-76098: 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

Fixed packages 3

ReleasePackageFixed in
Amazon Linux · 2023 python-mistune-debugsource 0:0.8.3-14.amzn2023.0.4
Amazon Linux · 2023 python3-mistune 0:0.8.3-14.amzn2023.0.4
Amazon Linux · 2023 python3-mistune-debuginfo 0:0.8.3-14.amzn2023.0.4

Vulnerabilities 1

  • High 7.5
    CVE-2026-76098

    Mistune has Denial of Service — RecursionError via Excessive Emphasis Markers in Markdown

    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…

    lepture mistune mistune mistune Debian Ubuntu Azure Linux PyPI

References

  • web
    https://alas.aws.amazon.com/cve/html/CVE-2026-76098.html