{"id":"CVE-2026-115349","aliases":["GHSA-3q64-rw38-243v"],"url":"https://o3.security/vulnerability/CVE-2026-115349","summary":"Mistune 3.0.0 before 3.3.0 Denial of Service via Nested Bracket Parsing","details":"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.","published":"2026-10-22T19:13:26.171Z","modified":"2026-10-24T02:48:56.607260415Z","cvss":null,"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[],"fix":null,"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/115xxx/CVE-2026-115349.json"},{"type":"ADVISORY","url":"https://github.com/lepture/mistune/security/advisories/GHSA-3q64-rw38-243v"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-115349"},{"type":"ADVISORY","url":"https://www.vulncheck.com/advisories/mistune-3.0.0-before-3.3.0-denial-of-service-via-nested-bracket-parsing"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-10-24T02:48:56.607260415Z"}}