{"id":"CVE-2026-115352","revision":"f5a31854267c4e28854dc48ad8dc463a","records":[{"revision":"f5a31854267c4e28854dc48ad8dc463a","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-115352","aliases":[],"title":"Mistune before 3.3.0 Quadratic-Time DoS via Unmatched Brackets in Inline Parser","description":"Mistune before 3.3.0 contains an algorithmic complexity vulnerability in the inline link parser that allows unauthenticated attackers to exhaust CPU by submitting long runs of unmatched '[' characters. Attackers can send small markdown payloads that trigger O(N^2) parse_link_text and parse_link_label probing, occupying rendering workers for 30+ seconds per 16 KB input.","state":0,"publishedAt":"2026-10-22T19:13:28.427+00:00","modifiedAt":"2026-10-22T19:13:28.427+00:00","affected":[{"ecosystem":"Vendor product","name":"mistune","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"lepture\",\n                    \"product\": \"mistune\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"packageURL\": \"pkg:pypi/mistune\",\n                    \"versions\": [\n                        {\n                            \"version\": \"0\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"semver\",\n                            \"lessThan\": \"3.3.0\"\n                        },\n                        {\n                            \"version\": \"3.3.0\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","score":8.7,"severity":"HIGH"},{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5,"severity":"HIGH"}],"references":["https://github.com/lepture/mistune/security/advisories/GHSA-xrpv-r66x-8p7j","https://www.vulncheck.com/advisories/mistune-before-3.3.0-quadratic-time-dos-via-unmatched-brackets-in-inline-parser"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-115352","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-115352","identifiers":["CVE-2026-115352"]},"retained":false,"historicalAffected":[]}],"coverage":[]}