CVE-2026-115347High· 7.5▾ TwilightMistune 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 lon…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 41.3 · likelihood 0.1 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake. The CVSS score shown above comes from the assigning CNA record, not NVD.
Exploit-prediction probability, daily snapshots since Oct 24.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
0.4%
Last analysed / modified upstream
0.4% → 0.4%
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.
mistune < 3.3.0Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
CVE-2026-115352High· 7.5Mistune before 3.3.0 Quadratic-Time DoS via Unmatched Brackets in Inline Parser
CVE-2026-115348High· 7.5Mistune before 3.3.0 Quadratic-Time DoS via parse_link_text
CVE-2026-115349High· 7.5Mistune 3.0.0 before 3.3.0 Denial of Service via Nested Bracket Parsing
CVE-2026-115355High· 7.5Mistune before 3.3.0 Path Traversal and XSS via Include Directive
CVE-2026-115354Medium· 6.5Mistune before 3.3.0 Arbitrary Local File Read via Include Directive
CVE-2026-115351Medium· 4.7Mistune 3.2.1 before 3.3.0 CSS Injection via Figure Directive figwidth Option