{"id":"CVE-2020-7637","aliases":["GHSA-6gp3-h3jj-prx4","SNYK-JS-CLASSTRANSFORMER-564431"],"url":"https://o3.security/vulnerability/CVE-2020-7637","summary":"Prototype pollution in class-transformer","details":"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.","published":"2020-04-06T13:15:12.550Z","modified":"2026-07-09T14:43:47.608446Z","cvss":{"score":5.3,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N"},"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[{"ecosystem":"npm","name":"class-transformer","fixedVersion":"0.3.1"}],"fix":{"url":"https://github.com/typestack/class-transformer/commit/8f04eb9db02de708f1a20f6f2d2bb309b2fed01e","label":"typestack/class-transformer@8f04eb9"},"references":[{"type":"FIX","url":"https://github.com/typestack/class-transformer/commit/8f04eb9db02de708f1a20f6f2d2bb309b2fed01e"},{"type":"EVIDENCE","url":"https://snyk.io/vuln/SNYK-JS-CLASSTRANSFORMER-564431"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-07-09T14:43:47.608446Z"}}