PYSEC-2026-2210
At a glance
- Published
- Updated
- CVE
- CVE-2026-59922
- Aliases
- GHSA-c8j7-8cv4-2xmq
- CVSS_V3
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
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.
Affected packages
| Package | Versions |
|---|---|
| PyPI · mistune | introduced 0, fixed 3.3.0 |
References
- https://github.com/lepture/mistune/releases/tag/v3.3.0 ADVISORY
- https://github.com/lepture/mistune/commit/96d0f57f8fe9eeb06bb4cff521962a27d7c402e7 FIX
- https://github.com/lepture/mistune/security/advisories/GHSA-c8j7-8cv4-2xmq EVIDENCE
Sources
| Source | Licence |
|---|---|
| OSV.dev | CC-BY 4.0 — PyPA Advisory Database |