CVE-2026-59922

Description

Mistune is a Python Markdown parser with renderers and plugins. Prior to 3.3.0, a run of closed tilde, equals-sign, or caret marker pairs around a character causes quadratic work in src/mistune/plugins/formatting.py when the strikethrough, mark, or insert plugin scans for matching markers from each possible start position, allowing denial of service through CPU exhaustion. This issue is fixed in version 3.3.0.

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Produits concernés

• lepture mistune
• Mistune project mistune

Scores CVSS

Faiblesses (CWE)

• CWE-407
• CWE-1333

Références

• https://github.com/lepture/mistune/commit/96d0f57f8fe9eeb06bb4cff521962a27d7c402e7 Patch
• https://github.com/lepture/mistune/releases/tag/v3.3.0 Release Notes
• https://github.com/lepture/mistune/security/advisories/GHSA-c8j7-8cv4-2xmq ExploitVendor Advisory
• https://github.com/lepture/mistune/security/advisories/GHSA-c8j7-8cv4-2xmq ExploitVendor Advisory

Ailleurs

• NVD
• CVE.org
• CIRCL Vulnerability-Lookup
• CERT-FR
• GitHub Advisories