PYSEC-2026-2209
See a problem?- Import Source
- https://github.com/pypa/advisory-database/blob/main/vulns/mistune/PYSEC-2026-2209.yaml
- JSON Data
- https://api.osv.dev/v1/vulns/PYSEC-2026-2209
- Aliases
- Published
- 2026-05-26T21:16:39.953Z
- Modified
- 2026-07-13T07:15:29.089597285Z
- Severity
-
- 6.1 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N CVSS Calculator
- Summary
- [none]
- Details
-
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 numre = re.compile(r"^\d+(?:.\d*)?"). When the validated value is not a plain integer, renderblockimage() 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.
- References
Affected packages
PyPI / mistune
Package
- Name
- mistune
- View open source insights on deps.dev
- Purl
- pkg:pypi/mistune
Affected ranges
- Type
- ECOSYSTEM
- Events
-
Introduced0Unknown introduced version / All previous versions are affectedFixed3.2.1
Affected versions
0.*
0.1.0
0.2.0
0.3.0
0.3.1
0.4
0.4.1
0.5
0.5.1
0.6
0.7
0.7.1
0.7.2
0.7.3
0.7.4
0.8
0.8.1
0.8.2
0.8.3
0.8.4
2.*
2.0.0a1
2.0.0a2
2.0.0a3
2.0.0a4
2.0.0a5
2.0.0a6
2.0.0rc1
2.0.0
2.0.1
2.0.2
2.0.3
2.0.4
2.0.5
2.1.0
3.*
3.0.0a1
3.0.0a2
3.0.0a3
3.0.0rc1
3.0.0rc2
3.0.0rc3
3.0.0rc4
3.0.0rc5
3.0.0
3.0.1
3.0.2
3.1.0
3.1.1
3.1.2
3.1.3
3.1.4
3.2.0