This page tracks the Debian fix status. The vulnerability itself is described on the main CVE page. View CVE-2026-59929 →

DEBIAN-CVE-2026-59929

Mistune is a Python Markdown parser with renderers and plugins. Prior to 3.3.0, the safe_url filter in src/mistune/renderers/html.py blocks only javas...

Original description

The description as published by the source.

Mistune is a Python Markdown parser with renderers and plugins. Prior to 3.3.0, the safe_url filter in src/mistune/renderers/html.py blocks only javascript:, vbscript:, file:, and data: schemes, allowing legacy or chained schemes such as feed:, view-source:, jar:, livescript:, mocha:, ms-its:, mk:, and res: to reach rendered href and src attributes and potentially execute script in affected user agents. This issue is fixed in version 3.3.0.

Source: OSV.dev (Open Source Vulnerabilities) OSV

Affected packages

Debian:12 mistune

[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]

Debian:13 mistune

[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]

Debian:14 mistune

[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]

References

advisory security-tracker.debian.org