PyPI/mistune CVE-2026-59926: medium, EPSS 0.33%

Mistune: XSS via unescaped class option in Admonition directive

Action: Upgrade mistune to 3.3.0 or later.

pip install mistune==3.3.0

Affected

Fixed versions

Sources

• osv: GHSA-g97x-gvcm-x72h
• https://github.com/lepture/mistune/security/advisories/GHSA-g97x-gvcm-x72h
• https://nvd.nist.gov/vuln/detail/CVE-2026-59926
• https://github.com/lepture/mistune/commit/a3cb6e5655308797e8be021d6c7b5bab13cbace2
• https://github.com/lepture/mistune
• https://github.com/lepture/mistune/releases/tag/v3.2.1
• https://github.com/pypa/advisory-database/tree/main/vulns/mistune/PYSEC-2026-2214.yaml

CVE-2026-59926 · published 2026-07-20T21:34:14Z · modified 2026-07-20T21:46:40.083797845Z · JSON