{"id":"CVE-2020-28477","aliases":["GHSA-9qmh-276g-x5pj"],"url":"https://o3.security/vulnerability/CVE-2020-28477","summary":"Prototype Pollution in immer","details":"This affects all versions of package immer.","published":"2021-01-19T11:15:13.167Z","modified":"2026-07-08T21:25:42.518605Z","cvss":{"score":7.5,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},"epss":{"score":0.02293,"percentile":0.82225,"asOf":"2026-09-10"},"cisaKev":null,"exploitsKnown":2,"affectedPackages":[{"ecosystem":"npm","name":"immer","fixedVersion":"8.0.1"}],"fix":null,"references":[{"type":"WEB","url":"https://github.com/immerjs/immer/blob/master/src/plugins/patches.ts%23L213"},{"type":"EVIDENCE","url":"https://snyk.io/vuln/SNYK-JAVA-ORGWEBJARSNPM-1061986"},{"type":"EVIDENCE","url":"https://snyk.io/vuln/SNYK-JS-IMMER-1019369"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-07-08T21:25:42.518605Z"}}