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CVE-2026-44899

4.7 MEDIUM

Mistune is a Python Markdown parser with renderers and plugins

Published: 2026-05-26 · Last updated: 2026-05-28

Severity and scoring

CVSS
4.7 MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:N/A:N
CWE
CWE-79

Affected products

VendorProduct
mistune_projectmistune

Description

Mistune is a Python Markdown parser with renderers and plugins. Prior to 3.2.1, the Image directive plugin validates the :width: and :height: options with a regex compiled as _num_re = re.compile(r"^\d+(?:\.\d*)?"). When the validated value is not a plain integer, render_block_image() inserts it directly into a style="width:...;" or style="height:...;" attribute. Because the value was accepted by the prefix-only regex, any CSS after the leading digits reaches the style= attribute verbatim and without escaping. This vulnerability is fixed in 3.2.1.

Source: NVD

References

Related CVEs

Same vendor

  • CVE-2026-44898 — Mistune is a Python Markdown parser with renderers and plugins (6.1 MEDIUM)
  • CVE-2026-44897 — Mistune is a Python Markdown parser with renderers and plugins (6.1 MEDIUM)
  • CVE-2026-44896 — Mistune is a Python Markdown parser with renderers and plugins (6.1 MEDIUM)
  • CVE-2026-44708 — Mistune is a Python Markdown parser with renderers and plugins (6.1 MEDIUM)

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