CVE-2026-121438
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.
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The sources do not list affected products or versions for this vulnerability yet.
0.3%21st percentile
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Published
First publication at the source
Collected
First seen by Baba Yaga Security
Last modified
Latest change at the source