CVE-2026-59928
High · 7.5CVSS
7.5
EPSS
0.7%
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 Markdown document containing many repeated or distinct reference-link definitions causes quadratic work in src/mistune/block_parser.py and the ref_links environment dictionary handling, allowing denial of service through CPU exhaustion. This issue is fixed in version 3.3.0.
Affected packages
| Ecosystem | Package | Introduced | Fixed |
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