{"id":"CVE-2020-7637","aliases":["EUVD-2020-0368","GHSA-6gp3-h3jj-prx4","SNYK-JS-CLASSTRANSFORMER-564431"],"status":"published","title":"Prototype pollution in class-transformer","description":"class-transformer before 0.3.1 allow attackers to perform Prototype Pollution. The classToPlainFromExist function could be tricked into adding or modifying properties of Object.prototype using a __proto__ payload.","severity":{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","level":"medium","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-10","score":0.01188,"percentile":0.68165,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-1321","CWE-915"],"published":"2020-04-06T12:34:54Z","modified":"2026-10-20T10:53:30Z","fixes":[{"ecosystem":"npm","package":"class-transformer","fixed_in":["0.3.1"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"npm","package":"class-transformer","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.3.1"}]}]},{"source":"osv","ecosystem":"npm","package":"class-transformer","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"0.3.1"}]}]}],"products":[{"vendor":"class-transformer_project","product":"class-transformer"}],"references":[{"url":"https://github.com/typestack/class-transformer/commit/8f04eb9db02de708f1a20f6f2d2bb309b2fed01e","tags":["x_refsource_MISC","x_transferred","Patch","Third Party Advisory","fix","web"]},{"url":"https://snyk.io/vuln/SNYK-JS-CLASSTRANSFORMER-564431","tags":["x_refsource_MISC","x_transferred","Exploit","Third Party Advisory","evidence","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2020-7637","tags":["advisory"]},{"url":"https://github.com/typestack/class-transformer/blob/a650d9f490573443f62508bc063b857bcd5e2525/src/ClassTransformer.ts#L29-L31,","tags":["web"]},{"url":"https://github.com/advisories/GHSA-6gp3-h3jj-prx4"},{"url":"https://github.com/typestack/class-transformer","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2020-7637","description":"class-transformer before 0.3.1 allow attackers to perform Prototype Pollution. The classToPlainFromExist function could be tricked into adding or modifying properties of Object.prototype using a __proto__ payload.","status":"published","published":"2020-04-06T12:34:54Z","modified":"2024-08-04T09:33:19.944Z","updated_at":"2026-11-02T14:35:58.787905Z"}],"euvd":[{"id":"EUVD-2020-0368","description":"class-transformer before 0.3.1 allow attackers to perform Prototype Pollution. The classToPlainFromExist function could be tricked into adding or modifying properties of Object.prototype using a __proto__ payload.","status":"published","published":"2020-04-06T12:34:54Z","modified":"2024-08-04T09:33:19Z","updated_at":"2026-11-03T03:08:00.054795Z"}],"ghsa":[{"id":"GHSA-6gp3-h3jj-prx4","title":"Prototype pollution in class-transformer","description":"class-transformer through 0.2.3 is vulnerable to Prototype Pollution. The 'classToPlainFromExist' function could be tricked into adding or modifying properties of 'Object.prototype' using a '__proto__' payload.","status":"published","published":"2020-04-07T15:47:40Z","modified":"2023-01-27T05:08:29Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","level":"medium"}],"cwes":["CWE-915","CWE-1321"],"updated_at":"2026-11-02T14:36:22.592333Z"}],"nvd":[{"id":"CVE-2020-7637","description":"class-transformer before 0.3.1 allow attackers to perform Prototype Pollution. The classToPlainFromExist function could be tricked into adding or modifying properties of Object.prototype using a __proto__ payload.","status":"published","published":"2020-04-06T13:15:12.55Z","modified":"2026-06-17T03:25:09.603Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","level":"medium","assessor":"primary"},{"version":"2.0","score":5,"vector":"AV:N/AC:L/Au:N/C:N/I:P/A:N","level":"medium","assessor":"primary"}],"cwes":["CWE-1321"],"updated_at":"2026-11-02T14:05:57.678762Z"}],"osv":[{"id":"CVE-2020-7637","description":"class-transformer before 0.3.1 allow attackers to perform Prototype Pollution. The classToPlainFromExist function could be tricked into adding or modifying properties of Object.prototype using a __proto__ payload.","status":"published","published":"2020-04-06T13:15:12.55Z","modified":"2026-10-20T10:53:30.503740296Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","level":"medium"}],"updated_at":"2026-11-02T15:44:17.34531Z"},{"id":"GHSA-6gp3-h3jj-prx4","title":"Prototype pollution in class-transformer","description":"class-transformer through 0.2.3 is vulnerable to Prototype Pollution. The 'classToPlainFromExist' function could be tricked into adding or modifying properties of 'Object.prototype' using a '__proto__' payload.","status":"published","published":"2020-04-07T15:47:40Z","modified":"2026-07-08T06:49:53.325567657Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","level":"medium"}],"cwes":["CWE-1321","CWE-915"],"updated_at":"2026-11-02T15:46:39.618611Z"}]}}