CVE-2026-59924 | Mistune is a Python Markdown parser with renderers and plugi… | CVSS 5.9 MEDIUM

Description

Mistune is a Python Markdown parser with renderers and plugins. Prior to 3.3.0, Include.parse() joins and normalizes user-supplied include paths without verifying that the result remains within the intended markdown directory, allowing crafted include paths to access files outside that directory when markdown files are processed using md.read(). This issue is fixed in version 3.3.0.

Metadata

CVE ID: CVE-2026-59924
State: PUBLISHED
Assigner: GitHub_M
Reserved: 2026-07-07 18:20 UTC
Published: 2026-07-08 16:22 UTC
Last updated: 2026-07-08 17:10 UTC
Primary CWE: CWE-22
CWE-22: Improper Limitation of a Pathname to a Restricted Di…
Vendor / Product: lepture / mistune
Sources: cve.org · NVD

Severity & Metrics

5.9 MEDIUM CVSS 3.1

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

SSVC — CISA Coordinator

Exploitation: none
Automatable: no
Tech. Impact: partial

Affected products (1)

Vendor	Product	Platform	Versions
lepture	mistune	—	< 3.3.0

Weakness (CWE)

CWE	Source	Description
CWE-22	cna	CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

CVSS scores (1)

Score	Severity	Version	Source	Vector
5.9	MEDIUM	3.1	cna	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

References (3)

https://github.com/lepture/mistune/security/advisories/GHSA-r4rv-85jg-w4mf https://github.com/lepture/mistune/security/advisories/GHSA-r4rv-85jg-w4mf
https://github.com/lepture/mistune/commit/1bef343ade163fc3bb95572b15be720084cdb993 https://github.com/lepture/mistune/commit/1bef343ade163fc3bb95572b15be720084cdb993
https://github.com/lepture/mistune/releases/tag/v3.3.0 https://github.com/lepture/mistune/releases/tag/v3.3.0