Live › vulnerability › CVE-2026-115347
Go to dashboardMistune before 3.3.0 has a parsing flaw in link text handling that scans repeatedly when square brackets are unbalanced. An attacker who submits markdown with long runs of unmatched brackets to mistune.html() can stall worker processes for minutes.
Summary written from the sources below. Check the originals before acting.
First seen by InfraStack 2026-10-23 21:57 UTC. All times on this page are UTC.
No product ranges from the sources yet.
Run pip show mistune and check whether the installed version is below 3.3.0.
Upgrade mistune to 3.3.0 or later.
Each row is the first time that source carried this signal. The analyst’s rows are its own findings.
Mistune before 3.3.0 contains an inefficient algorithmic complexity vulnerability in parse_link_text that allows remote attackers to cause denial of service through unbalanced square brackets. Attackers can submit markdown containing long runs of unmatched brackets to mistune.html(), triggering repeated forward scans that stall worker processes for minutes.
This page as .md · .json · in your agent: get_signal("CVE-2026-115347")
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