{"id":"CVE-2020-28499","aliases":["GHSA-7wpw-2hjm-89gp"],"url":"https://o3.security/vulnerability/CVE-2020-28499","summary":"Prototype Pollution in merge","details":"All versions of package merge are vulnerable to Prototype Pollution via _recursiveMerge .","published":"2021-02-18T16:15:13.473Z","modified":"2026-08-27T03:49:12.175582983Z","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":null,"affectedPackages":[{"ecosystem":"npm","name":"merge","fixedVersion":"2.1.1"}],"fix":null,"references":[{"type":"WEB","url":"https://github.com/yeikos/js.merge/blob/master/src/index.ts%23L64"},{"type":"ADVISORY","url":"https://snyk.io/vuln/SNYK-JAVA-ORGWEBJARSNPM-1071049"},{"type":"ADVISORY","url":"https://snyk.io/vuln/SNYK-JS-MERGE-1042987"},{"type":"ADVISORY","url":"https://vuldb.com/?id.170146"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-27T03:49:12.175582983Z"}}