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BREW-adr-viewer-CVE-2026-44896 — Mistune has XSS via unescaped figclass/figwidth in Figure directive

Affected: Homebrew: adr-viewer

In `src/mistune/directives/image.py`, the `render_figure()` function concatenates `figclass` and `figwidth` options directly into HTML attributes without escaping (lines 152-168).

This allows attribute injection and XSS even when `HTMLRenderer(escape=True)` is used, because these values bypass the inline renderer.

Other attributes in the same file (src, alt, style) are properly escaped; figclass/figwidth were missed.

certfr-2026-avi-0685 — De multiples vulnérabilités ont été découvertes dans Microsoft Azure Linux. Elles permettent à un attaquant de provoque…

certfr-2026-avi-0685

EUVD-2026-325678

fkie_cve-2026-44896

Mistune is a Python Markdown parser with renderers and plugins. In 3.2.0 and earlier, in src/mistune/directives/image.py, the render_figure() function concatenates figclass and figwidth options directly into HTML attributes without escaping. This allows attribute injection and XSS even when HTMLRenderer(escape=True) is used, because these values bypass the inline renderer. Version 3.2.1 contains a patch.

GHSA-58cw-g322-p94v — Mistune has XSS via unescaped figclass/figwidth in Figure directive

Affected: PyPI: mistune

In `src/mistune/directives/image.py`, the `render_figure()` function concatenates `figclass` and `figwidth` options directly into HTML attributes without escaping (lines 152-168).

This allows attribute injection and XSS even when `HTMLRenderer(escape=True)` is used, because these values bypass the inline renderer.

Other attributes in the same file (src, alt, style) are properly escaped; figclass/figwidth were missed.

msrc_CVE-2026-44896 — Mistune: XSS via unescaped figclass/figwidth in Figure directive

msrc_CVE-2026-44896

openSUSE-SU-2026:20827-1 — Security update for python-mistune

Security update for python-mistune

PYSEC-2026-168

Affected: PyPI: mistune

Mistune is a Python Markdown parser with renderers and plugins. In 3.2.0 and realier, in src/mistune/directives/image.py, the render_figure() function concatenates figclass and figwidth options directly into HTML attributes without escaping. This allows attribute injection and XSS even when HTMLRenderer(escape=True) is used, because these values bypass the inline renderer.

SUSE-SU-2026:21858-1 — Security update for python-mistune

Security update for python-mistune

UBUNTU-CVE-2026-44896

Affected: Ubuntu:16.04:LTS: mistune, Ubuntu:18.04:LTS: mistune, Ubuntu:20.04:LTS: mistune, Ubuntu:22.04:LTS: mistune, Ubuntu:22.04:LTS: mistune0, Ubuntu:24.04:LTS: mistune, Ubuntu:24.04:LTS: mistune0, Ubuntu:25.10: mistune, Ubuntu:25.10: mistune0, Ubuntu:26.04:LTS: mistune and 1 more