PyPI/mistune CVE-2026-59927: medium 5.3, EPSS 0.53%

Mistune directives/include: mutual `.. include::` recursion crashes the renderer with `RecursionError`, denial of service via two attacker-controlled markdown files

Action: Upgrade mistune to 3.3.0 or later.

pip install mistune==3.3.0

Affected

Fixed versions

Sources

• osv: GHSA-8mpj-m6qm-5qr8
• https://github.com/lepture/mistune/security/advisories/GHSA-8mpj-m6qm-5qr8
• https://nvd.nist.gov/vuln/detail/CVE-2026-59927
• https://github.com/lepture/mistune/commit/1bef343ade163fc3bb95572b15be720084cdb993
• https://github.com/lepture/mistune
• https://github.com/lepture/mistune/releases/tag/v3.3.0
• https://github.com/pypa/advisory-database/tree/main/vulns/mistune/PYSEC-2026-2215.yaml

CVE-2026-59927 · published 2026-07-20T21:24:42Z · modified 2026-07-20T21:30:45.969881443Z · JSON