CVE-2026-59922

HighCVSS 7.5/10Last modified Oct 25, 2026

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.

Metrics

CVSS 3.1 7.5/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Weakness enumeration

CWE-407CWE-1333

Affected software

No affected versions have been published.

Timeline

Published
Jul 8, 2026
Last modified
Oct 25, 2026
NVD status
Analyzed

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CVE-2026-59922: High severity, CVSS 7.5 | Vulnix