{"id":"CVE-2021-23421","aliases":["EUVD-2021-2051","GHSA-f9cv-665r-275h"],"status":"published","title":"Prototype Pollution","description":"All versions of package merge-change are vulnerable to Prototype Pollution via the utils.set function.","severity":{"version":"3.1","score":5.6,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L/E:U/RL:U/RC:R","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-12","score":0.01084,"percentile":0.65682,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-1321","CWE-915"],"published":"2021-08-11T17:30:11Z","modified":"2026-06-17T03:38:43Z","affected":[{"source":"ghsa","ecosystem":"npm","package":"merge-change","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"last_affected":"1.8.1"}]}]},{"source":"osv","ecosystem":"npm","package":"merge-change","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"last_affected":"1.8.1"}]}]}],"products":[{"vendor":"merge-change_project","product":"merge-change"}],"references":[{"url":"https://snyk.io/vuln/SNYK-JS-MERGECHANGE-1310985","tags":["x_refsource_MISC","x_transferred","Exploit","Third Party Advisory","web"]},{"url":"https://github.com/VladimirShestakov/merge-change/blob/9901f145e06158f284f52de42e6ba5b0f702fb65/utils.js%23L89-L123","tags":["x_refsource_MISC","x_transferred","Broken Link"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-23421","tags":["advisory"]},{"url":"https://github.com/VladimirShestakov/merge-change/blob/9901f145e06158f284f52de42e6ba5b0f702fb65/utils.js#L89-L123","tags":["web"]},{"url":"https://github.com/advisories/GHSA-f9cv-665r-275h"},{"url":"https://github.com/VladimirShestakov/merge-change","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2021-23421","title":"Prototype Pollution","description":"All versions of package merge-change are vulnerable to Prototype Pollution via the utils.set function.","status":"published","published":"2021-08-11T17:30:11.828Z","modified":"2024-09-17T02:42:41.799Z","cvss":[{"version":"3.1","score":5.6,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L/E:U/RL:U/RC:R","level":"medium","assessor":"cna"}],"updated_at":"2026-11-02T14:33:00.819444Z"}],"euvd":[{"id":"EUVD-2021-2051","description":"All versions of package merge-change are vulnerable to Prototype Pollution via the utils.set function.","status":"published","published":"2021-08-11T17:30:11Z","modified":"2024-09-17T02:42:41Z","cvss":[{"version":"3.1","score":5.6,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L/E:U/RL:U/RC:R","level":"medium"}],"updated_at":"2026-11-03T00:28:37.764675Z"}],"ghsa":[{"id":"GHSA-f9cv-665r-275h","title":"Prototype Pollution in merge-change","description":"All current versions of package merge-change are vulnerable to Prototype Pollution via the utils.set function.","status":"published","published":"2021-09-01T18:36:01Z","modified":"2023-02-01T05:06:18Z","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"],"updated_at":"2026-11-02T14:36:38.281533Z"}],"nvd":[{"id":"CVE-2021-23421","description":"All versions of package merge-change are vulnerable to Prototype Pollution via the utils.set function.","status":"published","published":"2021-08-11T18:15:07.323Z","modified":"2026-06-17T03:38:43.96Z","cvss":[{"version":"3.1","score":5.6,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L","level":"medium","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":"2026-11-02T14:06:56.943671Z"}],"osv":[{"id":"GHSA-f9cv-665r-275h","title":"Prototype Pollution in merge-change","description":"All current versions of package merge-change are vulnerable to Prototype Pollution via the utils.set function.","status":"published","published":"2021-09-01T18:36:01Z","modified":"2023-11-08T04:05:08.682361Z","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"],"updated_at":"2026-11-02T15:46:46.39441Z"}]}}