{"id":"CVE-2021-26505","aliases":["EUVD-2023-2286","GHSA-g3vf-47fv-8f3c"],"status":"published","title":"MrSwitch hello.js vulnerable to prototype pollution","description":"Prototype pollution vulnerability in MrSwitch hello.js version 1.18.6, allows remote attackers to execute arbitrary code via hello.utils.extend function.","severity":{"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","from":"nvd"},"epss":{"day":"2026-11-12","score":0.01144,"percentile":0.67163,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-1321"],"published":"2023-08-11T00:00:00Z","modified":"2026-10-20T10:54:34Z","fixes":[{"ecosystem":"npm","package":"hellojs","fixed_in":["1.18.8"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"npm","package":"hellojs","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.18.8"}]}]},{"source":"osv","ecosystem":"npm","package":"hellojs","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"1.18.8"}]}]}],"products":[{"vendor":"hello.js_project","product":"hello.js"}],"references":[{"url":"https://github.com/MrSwitch/hello.js/issues/634","tags":["x_transferred","Issue Tracking","report","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-26505","tags":["advisory"]},{"url":"https://github.com/MrSwitch/hello.js/commit/7ab50aeff2d41991f08d4ad6c0481125eea8f6b7","tags":["web"]},{"url":"https://github.com/advisories/GHSA-g3vf-47fv-8f3c"},{"url":"https://github.com/MrSwitch/hello.js","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2021-26505","description":"Prototype pollution vulnerability in MrSwitch hello.js version 1.18.6, allows remote attackers to execute arbitrary code via hello.utils.extend function.","status":"published","published":"2023-08-11T00:00:00Z","modified":"2024-10-09T17:48:29.673Z","updated_at":"2026-11-02T14:32:57.368269Z"}],"euvd":[{"id":"EUVD-2023-2286","description":"Prototype pollution vulnerability in MrSwitch hello.js version 1.18.6, allows remote attackers to execute arbitrary code via hello.utils.extend function.","status":"published","published":"2023-08-11T00:00:00Z","modified":"2024-10-09T17:48:29Z","updated_at":"2026-11-03T00:27:42.985312Z"}],"ghsa":[{"id":"GHSA-g3vf-47fv-8f3c","title":"MrSwitch hello.js vulnerable to prototype pollution","description":"A prototype pollution vulnerability in MrSwitch hello.js prior to version 1.18.8 allows remote attackers to execute arbitrary code via `hello.utils.extend` function.","status":"published","published":"2023-08-11T15:30:46Z","modified":"2023-11-09T05:05:48Z","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"],"updated_at":"2026-11-02T14:37:18.40412Z"}],"nvd":[{"id":"CVE-2021-26505","description":"Prototype pollution vulnerability in MrSwitch hello.js version 1.18.6, allows remote attackers to execute arbitrary code via hello.utils.extend function.","status":"published","published":"2023-08-11T14:15:12.257Z","modified":"2026-06-17T03:43:26.813Z","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"}],"cwes":["CWE-1321"],"updated_at":"2026-11-02T14:07:07.764332Z"}],"osv":[{"id":"CVE-2021-26505","description":"Prototype pollution vulnerability in MrSwitch hello.js version 1.18.6, allows remote attackers to execute arbitrary code via hello.utils.extend function.","status":"published","published":"2023-08-11T14:15:12.257Z","modified":"2026-10-20T10:54:34.243253604Z","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-g3vf-47fv-8f3c","title":"MrSwitch hello.js vulnerable to prototype pollution","description":"A prototype pollution vulnerability in MrSwitch hello.js prior to version 1.18.8 allows remote attackers to execute arbitrary code via `hello.utils.extend` function.","status":"published","published":"2023-08-11T15:30:46Z","modified":"2023-11-08T04:05:21.032993Z","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"],"updated_at":"2026-11-02T15:46:47.119724Z"}]}}