CVE-2026-121438
Medium · 5.3CVSS
5.3
EPSS
0.3%
Published
Nov 3, 2026
CISA due date
—
The record
Mistune before 3.3.3 contains a denial of service vulnerability in InlineParser.parse_link that allows attackers to cause quadratic CPU growth by supplying balanced nested brackets. Attackers can submit crafted Markdown with thousands of nested bracket pairs not forming a valid link, triggering repeated _contains_nested_link scans that exhaust CPU in parsing applications.
Affected packages
| Ecosystem | Package | Introduced | Fixed |
|---|
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