{"id":"CVE-2020-20136","details":"QuantConnect Lean versions from 2.3.0.0 to 2.4.0.1 are affected by an insecure deserialization vulnerability due to insecure configuration of TypeNameHandling property in Json.NET library.","aliases":["GHSA-ww7r-278h-48mh"],"modified":"2026-03-14T10:15:22.371816Z","published":"2020-12-14T19:15:12.613Z","references":[{"type":"EVIDENCE","url":"https://github.com/QuantConnect/Lean/issues/3537"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/quantconnect/lean","events":[{"introduced":"629d71a3eb20112d4a4bcbd37ba2bf715c64c202"},{"last_affected":"64cf1ff870bd8670cb9a3c301258f597f51a9d8c"}],"database_specific":{"versions":[{"introduced":"2.3.0.0"},{"last_affected":"2.4.0.1"}]}}],"versions":["v2.3.0.0","v2.3.0.2","v2.3.0.3","v2.4.0.0","v2.4.0.1"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2020-20136.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"}]}