{"id":"CVE-2026-115347","title":"Mistune before 3.3.0 Quadratic Denial of Service via parse_link_text","summary":"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 lon…","severity":"high","cvss":7.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","cvssSource":"cna","cwe":["CWE-407"],"vendor":"lepture","product":"mistune","affected":["mistune < 3.3.0"],"published":"2026-10-22","updated":"2026-10-22","sourceUpdated":"2026-10-22T19:13:24.689Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-115347","references":[{"url":"https://github.com/lepture/mistune/security/advisories/GHSA-f32h-38gf-rg5r","label":"GitHub Security Advisory (GHSA-f32h-38gf-rg5r)"},{"url":"https://www.vulncheck.com/advisories/mistune-before-3.3.0-quadratic-denial-of-service-via-parse-link-text","label":"VulnCheck Advisory: Mistune before 3.3.0 Quadratic Denial of Service via parse_link_text"}],"tags":["cve.org"],"ingestedAt":"2026-10-22T22:00:50.395Z","slug":"CVE-2026-115347","body":"## Overview\n\nMistune 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.\n\n## Affected\n\n- `mistune < 3.3.0`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":41,"depthScoreParts":{"impact":41.3,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}