PT-2026-56508 · Pypi · Mistune
CVE-2026-59922
·
Published
2026-07-08
·
Updated
2026-07-21
CVSS v3.1
7.5
High
| Vector | AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
Name of the Vulnerable Software and Affected Versions
Mistune versions prior to 3.3.0
Description
A flaw in the Python Markdown parser occurs when the strikethrough, mark, or insert plugins scan for matching markers from each possible start position. Specifically, a sequence of closed tilde, equals-sign, or caret marker pairs around a character triggers quadratic work in
src/mistune/plugins/formatting.py, which can lead to a denial of service via CPU exhaustion.Recommendations
Update to version 3.3.0.
Exploit
Fix
DoS
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Related Identifiers
Affected Products
Mistune