{"id":"CVE-2021-23568","aliases":["GHSA-gjm5-83cw-p3p2"],"url":"https://o3.security/vulnerability/CVE-2021-23568","summary":"Prototype Pollution in extend2","details":"The package extend2 before 1.0.1 are vulnerable to Prototype Pollution via the extend function due to unsafe recursive merge.","published":"2022-01-10T14:10:17.043Z","modified":"2026-07-09T11:23:57.322500Z","cvss":{"score":9.8,"severity":"CRITICAL","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":1,"affectedPackages":[{"ecosystem":"npm","name":"extend2","fixedVersion":"1.0.1"}],"fix":{"url":"https://github.com/eggjs/extend2/commit/aa332a59116c8398976434b57ea477c6823054f8","label":"eggjs/extend2@aa332a5"},"references":[{"type":"WEB","url":"https://github.com/eggjs/extend2/blob/master/index.js%23L50-L60"},{"type":"FIX","url":"https://github.com/eggjs/extend2/commit/aa332a59116c8398976434b57ea477c6823054f8"},{"type":"FIX","url":"https://github.com/eggjs/extend2/pull/2"},{"type":"EVIDENCE","url":"https://snyk.io/vuln/SNYK-JS-EXTEND2-2320315"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-07-09T11:23:57.322500Z"}}