{"id":"CVE-2021-3645","aliases":["EUVD-2021-2043","GHSA-cqqh-49mx-fq63"],"status":"published","title":"Prototype Pollution in viking04/merge","description":"merge is vulnerable to Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')","severity":{"version":"3.0","score":6.8,"vector":"CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-09","score":0.01429,"percentile":0.73193,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-1321","CWE-915"],"published":"2021-09-10T11:04:25Z","modified":"2026-10-20T10:53:50Z","fixes":[{"ecosystem":"npm","package":"@viking04/merge","fixed_in":["1.0.2"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"npm","package":"@viking04/merge","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.0.2"}]}]},{"source":"osv","ecosystem":"npm","package":"@viking04/merge","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"1.0.2"}]}]}],"products":[{"vendor":"merge_project","product":"merge"},{"vendor":"viking04","product":"viking04/merge"}],"references":[{"url":"https://huntr.dev/bounties/ef387a9e-ca3c-4c21-80e3-d34a6a896262","tags":["x_refsource_CONFIRM","x_transferred","Exploit","Third Party Advisory","evidence","web"]},{"url":"https://github.com/viking04/merge/commit/baba40332080b38b33840d2614df6d4142dedaf6","tags":["x_refsource_MISC","x_transferred","Patch","Third Party Advisory","fix","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-3645","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-cqqh-49mx-fq63"},{"url":"https://github.com/viking04/merge","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2021-3645","title":"Prototype Pollution in viking04/merge","description":"merge is vulnerable to Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')","status":"published","published":"2021-09-10T11:04:25Z","modified":"2024-08-03T17:01:07.653Z","cvss":[{"version":"3.0","score":6.8,"vector":"CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N","level":"medium","assessor":"cna"}],"cwes":["CWE-1321"],"updated_at":"2026-11-02T14:33:03.671751Z"}],"euvd":[{"id":"EUVD-2021-2043","description":"merge is vulnerable to Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')","status":"published","published":"2021-09-10T11:04:25Z","modified":"2024-08-03T17:01:07Z","cvss":[{"version":"3.0","score":6.8,"vector":"CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N","level":"medium"}],"updated_at":"2026-11-03T03:25:12.535968Z"}],"ghsa":[{"id":"GHSA-cqqh-49mx-fq63","title":"merge vulnerable to Prototype Pollution","description":"merge is vulnerable to Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')","status":"published","published":"2021-09-13T20:16:54Z","modified":"2023-01-29T05:02:32Z","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"}],"cwes":["CWE-915","CWE-1321"],"updated_at":"2026-11-02T14:36:25.064927Z"}],"nvd":[{"id":"CVE-2021-3645","description":"merge is vulnerable to Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')","status":"published","published":"2021-09-10T11:15:09.933Z","modified":"2026-06-17T04:05:29.97Z","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":6.8,"vector":"CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N","level":"medium","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":"2026-11-02T14:06:58.502206Z"}],"osv":[{"id":"CVE-2021-3645","description":"merge is vulnerable to Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')","status":"published","published":"2021-09-10T11:15:09.933Z","modified":"2026-10-20T10:53:50.848276415Z","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-cqqh-49mx-fq63","title":"merge vulnerable to Prototype Pollution","description":"merge is vulnerable to Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')","status":"published","published":"2021-09-13T20:16:54Z","modified":"2023-11-08T04:06:14.516715Z","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"}],"cwes":["CWE-1321","CWE-915"],"updated_at":"2026-11-02T15:46:45.28161Z"}]}}