{"id":"CVE-2026-115349","revision":"ee1efee6b0264c32b12a381571b1033c","records":[{"revision":"ee1efee6b0264c32b12a381571b1033c","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-115349","aliases":[],"title":"Mistune 3.0.0 before 3.3.0 Denial of Service via Nested Bracket Parsing","description":"Mistune from 3.0.0 before 3.3.0 contains an algorithmic complexity denial of service vulnerability in the parse_link_text function in src/mistune/helpers.py. Attackers can submit markdown with deeply nested square brackets triggering quadratic parsing time, exhausting server CPU with small crafted requests.","state":0,"publishedAt":"2026-10-22T19:13:26.171+00:00","modifiedAt":"2026-10-22T19:13:26.171+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\": \"3.0.0\",\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-3q64-rw38-243v","https://www.vulncheck.com/advisories/mistune-3.0.0-before-3.3.0-denial-of-service-via-nested-bracket-parsing"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-115349","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-115349","identifiers":["CVE-2026-115349"]},"retained":false,"historicalAffected":[]}],"coverage":[]}