{"id":"CVE-2021-3757","aliases":["GHSA-c36v-fmgq-m8hx"],"url":"https://o3.security/vulnerability/CVE-2021-3757","summary":"Prototype Pollution in immer","details":"immer is vulnerable to Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')","published":"2021-09-02T12:15:07.617Z","modified":"2026-07-09T05:44:41.968219Z","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":"immer","fixedVersion":"9.0.6"}],"fix":{"url":"https://github.com/immerjs/immer/commit/fa671e55ee9bd42ae08cc239102b665a23958237","label":"immerjs/immer@fa671e5"},"references":[{"type":"FIX","url":"https://github.com/immerjs/immer/commit/fa671e55ee9bd42ae08cc239102b665a23958237"},{"type":"FIX","url":"https://huntr.dev/bounties/23d38099-71cd-42ed-a77a-71e68094adfa"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-07-09T05:44:41.968219Z"}}