{"id":"CVE-2021-23568","aliases":["EUVD-2022-0606","GHSA-gjm5-83cw-p3p2","SNYK-JS-EXTEND2-2320315"],"status":"published","title":"Prototype Pollution","description":"The package extend2 before 1.0.1 are vulnerable to Prototype Pollution via the extend function due to unsafe recursive merge.","severity":{"version":"3.1","score":7.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:P","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.01498,"percentile":0.74568,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-1321"],"published":"2022-01-07T20:05:13Z","modified":"2026-10-20T10:54:32Z","fixes":[{"ecosystem":"npm","package":"extend2","fixed_in":["1.0.1"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"npm","package":"extend2","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.0.1"}]}]},{"source":"osv","ecosystem":"npm","package":"extend2","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"1.0.1"}]}]}],"products":[{"vendor":"eggjs","product":"extend2"}],"references":[{"url":"https://snyk.io/vuln/SNYK-JS-EXTEND2-2320315","tags":["x_refsource_MISC","x_transferred","Exploit","Third Party Advisory","evidence","web"]},{"url":"https://github.com/eggjs/extend2/blob/master/index.js%23L50-L60","tags":["x_refsource_MISC","x_transferred","Broken Link","web"]},{"url":"https://github.com/eggjs/extend2/commit/aa332a59116c8398976434b57ea477c6823054f8","tags":["x_refsource_MISC","x_transferred","Patch","Third Party Advisory","fix","web"]},{"url":"https://github.com/eggjs/extend2/pull/2","tags":["x_refsource_MISC","x_transferred","Issue Tracking","Patch","Third Party Advisory","fix","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-23568","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-gjm5-83cw-p3p2"},{"url":"https://github.com/eggjs/extend2","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2021-23568","title":"Prototype Pollution","description":"The package extend2 before 1.0.1 are vulnerable to Prototype Pollution via the extend function due to unsafe recursive merge.","status":"published","published":"2022-01-07T20:05:13.398Z","modified":"2024-09-16T17:54:22.698Z","cvss":[{"version":"3.1","score":7.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:P","level":"high","assessor":"cna"}],"updated_at":"2026-11-02T14:33:00.488332Z"}],"euvd":[{"id":"EUVD-2022-0606","description":"The package extend2 before 1.0.1 are vulnerable to Prototype Pollution via the extend function due to unsafe recursive merge.","status":"published","published":"2022-01-07T20:05:13Z","modified":"2024-09-16T17:54:22Z","cvss":[{"version":"3.1","score":7.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:P","level":"high"}],"updated_at":"2026-11-03T00:55:37.743963Z"}],"ghsa":[{"id":"GHSA-gjm5-83cw-p3p2","title":"Prototype Pollution in extend2","description":"The package extend2 before 1.0.1 are vulnerable to Prototype Pollution via the extend function due to unsafe recursive merge.","status":"published","published":"2022-01-12T22:59:13Z","modified":"2023-02-03T05:04:24Z","cvss":[{"version":"3.1","score":7.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L","level":"high"}],"cwes":["CWE-1321"],"updated_at":"2026-11-02T14:36:41.967989Z"}],"nvd":[{"id":"CVE-2021-23568","description":"The package extend2 before 1.0.1 are vulnerable to Prototype Pollution via the extend function due to unsafe recursive merge.","status":"published","published":"2022-01-10T14:10:17.043Z","modified":"2026-06-17T03:38:50.067Z","cvss":[{"version":"3.1","score":7.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/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":"2026-11-02T14:07:03.418194Z"}],"osv":[{"id":"CVE-2021-23568","description":"The package extend2 before 1.0.1 are vulnerable to Prototype Pollution via the extend function due to unsafe recursive merge.","status":"published","published":"2022-01-10T14:10:17.043Z","modified":"2026-10-20T10:54:32.760980704Z","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":"2026-11-02T15:44:18.778776Z"},{"id":"GHSA-gjm5-83cw-p3p2","title":"Prototype Pollution in extend2","description":"The package extend2 before 1.0.1 are vulnerable to Prototype Pollution via the extend function due to unsafe recursive merge.","status":"published","published":"2022-01-12T22:59:13Z","modified":"2026-09-10T03:49:27.701468105Z","cvss":[{"version":"3.1","score":7.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L","level":"high"}],"cwes":["CWE-1321"],"updated_at":"2026-11-02T15:46:47.822182Z"}]}}