{"id":"CVE-2021-3757","aliases":["CLSA-2026-1792746527","EUVD-2021-2031","GHSA-c36v-fmgq-m8hx","ROOT-APP-NPM-CVE-2021-3757"],"status":"published","title":"Prototype Pollution in immerjs/immer","description":"immer is vulnerable to Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')","severity":{"version":"3.0","score":7.5,"vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-09","score":0.01664,"percentile":0.76888,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-1321","CWE-915"],"published":"2021-09-02T12:06:26Z","modified":"2026-10-23T13:45:35Z","fixes":[{"ecosystem":"npm","package":"immer","fixed_in":["9.0.6"],"sources":["ghsa","osv"]},{"ecosystem":"Root:npm","package":"immer","fixed_in":["8.0.1-aikido.2"],"sources":["osv"]},{"ecosystem":"Root:npm","package":"@rootio/immer","fixed_in":["8.0.1-root.io.2"],"sources":["osv"]}],"affected":[{"source":"ghsa","ecosystem":"npm","package":"immer","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"7.0.0"},{"fixed":"9.0.6"}]}]},{"source":"osv","ecosystem":"TuxCare:npm","package":"immer","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"8.0.1-tuxcare.0"},{"fixed":"8.0.1-tuxcare.1"}]}],"versions":["8.0.1"],"bundled":2},{"source":"osv","ecosystem":"npm","package":"immer","ranges":[{"type":"SEMVER","events":[{"introduced":"7.0.0"},{"fixed":"9.0.6"}]}]},{"source":"osv","ecosystem":"Root:npm","package":"immer","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"8.0.1-aikido.2"}]}]},{"source":"osv","ecosystem":"Root:npm","package":"@rootio/immer","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"8.0.1-root.io.2"}]}]}],"products":[{"vendor":"immer_project","product":"immer"},{"vendor":"immerjs","product":"immerjs/immer"}],"references":[{"url":"https://github.com/immerjs/immer/commit/fa671e55ee9bd42ae08cc239102b665a23958237","tags":["x_refsource_MISC","x_transferred","Patch","Third Party Advisory","fix","web"]},{"url":"https://huntr.dev/bounties/23d38099-71cd-42ed-a77a-71e68094adfa","tags":["x_refsource_CONFIRM","x_transferred","Exploit","Issue Tracking","Patch","Third Party Advisory","fix","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-3757","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-c36v-fmgq-m8hx"},{"url":"https://github.com/immerjs/immer","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2021-3757","title":"Prototype Pollution in immerjs/immer","description":"immer is vulnerable to Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')","status":"published","published":"2021-09-02T12:06:26Z","modified":"2024-08-03T17:09:09.144Z","cvss":[{"version":"3.0","score":7.5,"vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"cna"}],"cwes":["CWE-1321"],"updated_at":"2026-11-02T14:33:03.671751Z"}],"euvd":[{"id":"EUVD-2021-2031","description":"immer is vulnerable to Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')","status":"published","published":"2021-09-02T12:06:26Z","modified":"2024-08-03T17:09:09Z","cvss":[{"version":"3.0","score":7.5,"vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-03T03:25:11.376657Z"}],"ghsa":[{"id":"GHSA-c36v-fmgq-m8hx","title":"Prototype Pollution in immer","description":"immer is vulnerable to Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution').","status":"published","published":"2021-09-07T22:57:14Z","modified":"2024-04-25T22:09:14Z","cvss":[{"version":"3.0","score":7.5,"vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"cwes":["CWE-915","CWE-1321"],"updated_at":"2026-11-02T14:37:47.338362Z"}],"nvd":[{"id":"CVE-2021-3757","description":"immer is vulnerable to Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')","status":"published","published":"2021-09-02T12:15:07.617Z","modified":"2026-06-17T04:05:42.463Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"primary"},{"version":"3.0","score":7.5,"vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"secondary"},{"version":"2.0","score":7.5,"vector":"AV:N/AC:L/Au:N/C:P/I:P/A:P","level":"high","assessor":"primary"}],"cwes":["CWE-1321"],"updated_at":"2026-11-02T14:06:58.05696Z"}],"osv":[{"id":"CVE-2021-3757","description":"immer is vulnerable to Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')","status":"published","published":"2021-09-02T12:15:07.617Z","modified":"2026-10-20T10:53:52.158160659Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical"}],"updated_at":"2026-11-02T15:44:20.434873Z"},{"id":"GHSA-c36v-fmgq-m8hx","title":"Prototype Pollution in immer","description":"immer is vulnerable to Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution').","status":"published","published":"2021-09-07T22:57:14Z","modified":"2024-04-25T22:09:12Z","cvss":[{"version":"3.0","score":7.5,"vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"cwes":["CWE-1321","CWE-915"],"updated_at":"2026-11-02T15:46:44.571161Z"},{"id":"CLSA-2026-1792746527","title":"TuxCare security update for immer (2 CVEs)","description":"TuxCare rebuilt immer to address 2 CVEs. Fixed in 8.0.1-tuxcare.1.","status":"published","published":"2026-10-23T09:08:47Z","modified":"2026-10-23T13:45:35.178704601Z","updated_at":"2026-11-02T15:43:54.981307Z"},{"id":"ROOT-APP-NPM-CVE-2021-3757","title":"CVE-2021-3757 in immer - Patched by Root","description":"Root has patched CVE-2021-3757 in the immer package for Root:npm. Multiple fixed versions available.","status":"published","published":"2026-09-02T06:57:26Z","modified":"2026-09-02T08:00:04.205701353Z","updated_at":"2026-11-02T15:53:27.362922Z"}]}}