Arbitrary Code Injection Affecting mistune package, versions *


Severity

Recommended
0.0
medium
0
10

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Threat Intelligence

EPSS
0.22% (12th percentile)

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  • Snyk IDSNYK-DEBIAN12-MISTUNE-21602972
  • published23 Oct 2026
  • disclosed22 Oct 2026

Introduced: 22 Oct 2026

NewCVE-2026-115351  (opens in a new tab)
CWE-94  (opens in a new tab)

How to fix?

There is no fixed version for Debian:12 mistune.

NVD Description

Note: Versions mentioned in the description apply only to the upstream mistune package and not the mistune package as distributed by Debian. See How to fix? for Debian:12 relevant fixed versions and status.

Mistune from 3.2.1 before 3.3.0 contains a CSS injection vulnerability that allows attackers controlling markdown input to inject arbitrary style declarations via the unvalidated figwidth option of the figure directive. Attackers can append declarations like background:url() to the rendered figure style attribute, forcing victim browsers to send requests to attacker servers and leak attribute values.

CVSS Base Scores

version 3.1