{"id":"CVE-2018-3720","aliases":["EUVD-2018-0345","GHSA-xcvv-84j5-jw9h"],"status":"published","title":"Prototype Pollution in assign-deep","description":"assign-deep node module before 0.4.7 suffers from a Modification of Assumed-Immutable Data (MAID) vulnerability, which allows a malicious user to modify the prototype of \"Object\" via __proto__, causing the addition or modification of an existing property that will exist on all objects.","severity":{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-07","score":0.01988,"percentile":0.80741,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-1321","CWE-471"],"published":"2018-06-07T02:00:00Z","modified":"2026-10-20T10:49:49Z","fixes":[{"ecosystem":"npm","package":"assign-deep","fixed_in":["0.4.7"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"npm","package":"assign-deep","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.4.7"}]}]},{"source":"osv","ecosystem":"npm","package":"assign-deep","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"0.4.7"}]}]}],"products":[{"vendor":"assign-deep_project","product":"assign-deep"},{"vendor":"hackerone","product":"assign-deep node module"}],"references":[{"url":"https://hackerone.com/reports/310707","tags":["x_refsource_MISC","x_transferred","Exploit","Third Party Advisory","evidence","web"]},{"url":"https://github.com/jonschlinkert/assign-deep/commit/19953a8c089b0328c470acaaaf6accdfcb34da11","tags":["x_refsource_MISC","x_transferred","Patch","Third Party Advisory","fix","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2018-3720","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-xcvv-84j5-jw9h","tags":["advisory"]},{"url":"https://www.npmjs.com/advisories/579","tags":["web"]}],"sources":{"cve":[{"id":"CVE-2018-3720","description":"assign-deep node module before 0.4.7 suffers from a Modification of Assumed-Immutable Data (MAID) vulnerability, which allows a malicious user to modify the prototype of \"Object\" via __proto__, causing the addition or modification of an existing property that will exist on all objects.","status":"published","published":"2018-06-07T02:00:00Z","modified":"2024-09-16T22:56:52.1Z","cwes":["CWE-471"],"updated_at":"2026-11-02T14:35:05.262903Z"}],"euvd":[{"id":"EUVD-2018-0345","description":"assign-deep node module before 0.4.7 suffers from a Modification of Assumed-Immutable Data (MAID) vulnerability, which allows a malicious user to modify the prototype of \"Object\" via __proto__, causing the addition or modification of an existing property that will exist on all objects.","status":"published","published":"2018-06-07T02:00:00Z","modified":"2024-09-16T22:56:52Z","updated_at":"2026-11-03T00:54:58.273879Z"}],"ghsa":[{"id":"GHSA-xcvv-84j5-jw9h","title":"Prototype Pollution in assign-deep","description":"Versions of `assign-deep` before 0.4.7 are vulnerable to prototype pollution via merging functions.\n\n\n## Recommendation\n\nUpdate to version 0.4.7 or later.","status":"published","published":"2018-07-26T15:12:31Z","modified":"2023-09-08T23:03:40Z","cvss":[{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"cwes":["CWE-471","CWE-1321"],"updated_at":"2026-11-02T14:37:03.916765Z"}],"nvd":[{"id":"CVE-2018-3720","description":"assign-deep node module before 0.4.7 suffers from a Modification of Assumed-Immutable Data (MAID) vulnerability, which allows a malicious user to modify the prototype of \"Object\" via __proto__, causing the addition or modification of an existing property that will exist on all objects.","status":"published","published":"2018-06-07T02:29:08.27Z","modified":"2026-06-17T01:57:43.26Z","cvss":[{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"primary"},{"version":"2.0","score":6.5,"vector":"AV:N/AC:L/Au:S/C:P/I:P/A:P","level":"medium","assessor":"primary"}],"cwes":["CWE-471"],"updated_at":"2026-11-02T14:04:28.483469Z"}],"osv":[{"id":"CVE-2018-3720","description":"assign-deep node module before 0.4.7 suffers from a Modification of Assumed-Immutable Data (MAID) vulnerability, which allows a malicious user to modify the prototype of \"Object\" via __proto__, causing the addition or modification of an existing property that will exist on all objects.","status":"published","published":"2018-06-07T02:29:08.27Z","modified":"2026-10-20T10:49:49.650761506Z","cvss":[{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T15:44:09.442568Z"},{"id":"GHSA-xcvv-84j5-jw9h","title":"Prototype Pollution in assign-deep","description":"Versions of `assign-deep` before 0.4.7 are vulnerable to prototype pollution via merging functions.\n\n\n## Recommendation\n\nUpdate to version 0.4.7 or later.","status":"published","published":"2018-07-26T15:12:31Z","modified":"2023-11-08T04:00:17.118883Z","cvss":[{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"cwes":["CWE-1321","CWE-471"],"updated_at":"2026-11-02T15:46:59.835583Z"}]}}