CVE-2026-59924

Mistune: Arbitrary File Read via Include directive path traversal

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.

Affected

lepture · mistune

CVSS v3.1 GITHUB

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

EPSS

0.46% chance of exploitation in the next 30 days, 39th percentile

Published

2026-07-08

Proof-of-concept exploits (1)

• advisories/GHSA-r4rv-85jg-w4mf

Security advisories

• lepture/mistune/security/advisories/GHSA-r4rv-85jg-w4mf
• lepture/mistune/commit/1bef343ade163fc3bb95572b15be720084cdb993

References

• CVE Record
• NVD entry