CVE-2026-59922
High · 7.5CVSS
7.5
EPSS
0.6%
Published
Jul 8, 2026
CISA due date
—
The record
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.
Affected packages
| Ecosystem | Package | Introduced | Fixed |
|---|
Related vulnerabilities
- CVE-2026-19630 In a BIND resolver, inbound DNS protocol messages with a particular structure will result… CWE-407
- CVE-2026-112894 Pillow is a Python imaging library. CWE-407
- CVE-2026-112891 Pillow is a Python imaging library. CWE-407
- CVE-2026-112401 Pillow is a Python imaging library. CWE-407
- CVE-2026-111766 markdown-it is a Markdown parser. CWE-407
- CVE-2026-111759 markdown-it is a Markdown parser. CWE-407
- CVE-2026-95838 containerd is an open-source container runtime. CWE-407
- CVE-2026-104844 PostCSS Selector Parser is a CSS selector parser that integrates with PostCSS but does… CWE-407