{"id":"CVE-2021-23452","aliases":["EUVD-2021-2155","GHSA-4mvj-rq4v-2fxw"],"status":"published","title":"Prototype Pollution","description":"This affects all versions of package x-assign. The global proto object can be polluted using the __proto__ object.","severity":{"version":"3.1","score":8.6,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L/E:P","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.0155,"percentile":0.75412,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-1321","CWE-915"],"published":"2021-10-20T12:15:12Z","modified":"2026-06-17T03:38:47Z","affected":[{"source":"ghsa","ecosystem":"npm","package":"x-assign","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"last_affected":"0.1.4"}]}]},{"source":"osv","ecosystem":"npm","package":"x-assign","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"last_affected":"0.1.4"}]}]}],"products":[{"vendor":"binaryops","product":"x-assign"}],"references":[{"url":"https://snyk.io/vuln/SNYK-JS-XASSIGN-1759314","tags":["x_refsource_MISC","x_transferred","Exploit","Third Party Advisory","web"]},{"url":"https://runkit.com/embed/sq8qjwemyn8t","tags":["x_refsource_MISC","x_transferred","Third Party Advisory","URL Repurposed","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-23452","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-4mvj-rq4v-2fxw"},{"url":"https://github.com/mvoorberg/x-assign","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2021-23452","title":"Prototype Pollution","description":"This affects all versions of package x-assign. The global proto object can be polluted using the __proto__ object.","status":"published","published":"2021-10-20T12:15:12.893Z","modified":"2024-09-16T23:06:33.921Z","cvss":[{"version":"3.1","score":8.6,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L/E:P","level":"high","assessor":"cna"}],"updated_at":"2026-11-02T14:33:00.819444Z"}],"euvd":[{"id":"EUVD-2021-2155","description":"This affects all versions of package x-assign. The global proto object can be polluted using the __proto__ object.","status":"published","published":"2021-10-20T12:15:12Z","modified":"2024-09-16T23:06:33Z","cvss":[{"version":"3.1","score":8.6,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L/E:P","level":"high"}],"updated_at":"2026-11-03T00:54:56.752396Z"}],"ghsa":[{"id":"GHSA-4mvj-rq4v-2fxw","title":"Prototype Pollution in x-assign","description":"This vulnerability affects all versions of package x-assign. The global proto object can be polluted using the __proto__ object.","status":"published","published":"2021-10-21T17:50:44Z","modified":"2023-01-27T05:08:30Z","cvss":[{"version":"3.1","score":8.6,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L","level":"high"}],"cwes":["CWE-915","CWE-1321"],"updated_at":"2026-11-02T14:36:22.592333Z"}],"nvd":[{"id":"CVE-2021-23452","description":"This affects all versions of package x-assign. The global proto object can be polluted using the __proto__ object.","status":"published","published":"2021-10-20T13:15:07.537Z","modified":"2026-06-17T03:38:47.38Z","cvss":[{"version":"3.1","score":8.6,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L","level":"high","assessor":"secondary"},{"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":"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":"2026-11-02T14:07:00.137719Z"}],"osv":[{"id":"GHSA-4mvj-rq4v-2fxw","title":"Prototype Pollution in x-assign","description":"This vulnerability affects all versions of package x-assign. The global proto object can be polluted using the __proto__ object.","status":"published","published":"2021-10-21T17:50:44Z","modified":"2023-11-08T04:05:10.522314Z","cvss":[{"version":"3.1","score":8.6,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L","level":"high"}],"cwes":["CWE-1321","CWE-915"],"updated_at":"2026-11-02T15:46:37.148947Z"}]}}