{"id":"CVE-2020-8147","aliases":["CLSA-2026-1771891821","EUVD-2020-0822","GHSA-6pq3-928q-x6w6"],"status":"published","title":"Prototype Pollution","description":"Flaw in input validation in npm package utils-extend version 1.0.8 and earlier may allow prototype pollution attack that may result in remote code execution or denial of service of applications using utils-extend.","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":"2026-11-08","score":0.03149,"percentile":0.88024,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-20","CWE-471"],"published":"2020-04-03T20:52:38Z","modified":"2026-10-15T09:47:46Z","affected":[{"source":"ghsa","ecosystem":"npm","package":"utils-extend","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0.0.0"}]}]},{"source":"osv","ecosystem":"TuxCare:npm","package":"utils-extend","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"1.0.8-tuxcare.0"},{"fixed":"1.0.8-tuxcare.1"}]}],"versions":["1.0.8"],"bundled":2},{"source":"osv","ecosystem":"npm","package":"utils-extend","ranges":[{"type":"SEMVER","events":[{"introduced":"0.0.0"}]}]}],"products":[{"vendor":"utils-extend_project","product":"utils-extend"}],"references":[{"url":"https://hackerone.com/reports/801522","tags":["x_refsource_MISC","x_transferred","Exploit","Third Party Advisory","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2020-8147","tags":["advisory"]},{"url":"https://www.npmjs.com/advisories/1502","tags":["web"]},{"url":"https://github.com/advisories/GHSA-6pq3-928q-x6w6"}],"sources":{"cve":[{"id":"CVE-2020-8147","description":"Flaw in input validation in npm package utils-extend version 1.0.8 and earlier may allow prototype pollution attack that may result in remote code execution or denial of service of applications using utils-extend.","status":"published","published":"2020-04-03T20:52:38Z","modified":"2024-08-04T09:48:25.67Z","cwes":["CWE-471"],"updated_at":"2026-11-02T14:35:50.545879Z"}],"euvd":[{"id":"EUVD-2020-0822","description":"Flaw in input validation in npm package utils-extend version 1.0.8 and earlier may allow prototype pollution attack that may result in remote code execution or denial of service of applications using utils-extend.","status":"published","published":"2020-04-03T20:52:38Z","modified":"2024-08-04T09:48:25Z","updated_at":"2026-11-03T03:07:58.506831Z"}],"ghsa":[{"id":"GHSA-6pq3-928q-x6w6","title":"Prototype Pollution","description":"All versions of `utils-extend` are vulnerable to prototype pollution. The `extend` function does not restrict the modification of an Object's prototype, which may allow an attacker to add or modify an existing property that will exist on all objects.\n\n## Recommendation\n\nNo fix is currently available. Consider using an alternative package until a fix is made available.","status":"published","published":"2020-09-03T15:51:28Z","modified":"2023-01-09T05:04:12Z","cwes":["CWE-471"],"updated_at":"2026-11-02T14:36:08.863482Z"}],"nvd":[{"id":"CVE-2020-8147","description":"Flaw in input validation in npm package utils-extend version 1.0.8 and earlier may allow prototype pollution attack that may result in remote code execution or denial of service of applications using utils-extend.","status":"published","published":"2020-04-03T21:15:12.78Z","modified":"2026-06-17T03:25:56.5Z","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":"2.0","score":7.5,"vector":"AV:N/AC:L/Au:N/C:P/I:P/A:P","level":"high","assessor":"primary"}],"cwes":["CWE-471","CWE-20"],"updated_at":"2026-11-02T14:05:57.678762Z"}],"osv":[{"id":"CLSA-2026-1771891821","title":"TuxCare security update for utils-extend (2 CVEs)","description":"TuxCare rebuilt utils-extend to address 2 CVEs. Fixed in 1.0.8-tuxcare.1.","status":"published","published":"2026-08-04T14:52:07Z","modified":"2026-10-15T09:47:46.440463844Z","updated_at":"2026-11-02T15:43:43.249928Z"},{"id":"GHSA-6pq3-928q-x6w6","title":"Prototype Pollution","description":"All versions of `utils-extend` are vulnerable to prototype pollution. The `extend` function does not restrict the modification of an Object's prototype, which may allow an attacker to add or modify an existing property that will exist on all objects.\n\n## Recommendation\n\nNo fix is currently available. Consider using an alternative package until a fix is made available.","status":"published","published":"2020-09-03T15:51:28Z","modified":"2023-11-08T04:04:14.320845Z","cwes":["CWE-471"],"updated_at":"2026-11-02T15:46:39.965326Z"}]}}