{"cve":"CVE-2020-7637","nvd":{"published":"2020-04-06T13:15:12.550","modified":"2026-06-17T03:25:09.603","status":"Modified","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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","score":5.3},"cwes":["CWE-1321"],"references":["https://github.com/typestack/class-transformer/commit/8f04eb9db02de708f1a20f6f2d2bb309b2fed01e","https://snyk.io/vuln/SNYK-JS-CLASSTRANSFORMER-564431","https://github.com/typestack/class-transformer/commit/8f04eb9db02de708f1a20f6f2d2bb309b2fed01e","https://snyk.io/vuln/SNYK-JS-CLASSTRANSFORMER-564431"],"products":["class-transformer_project:class-transformer"],"source":"nvd","synced_at":"2026-10-19T21:03:08.679916934+00:00"},"epss":{"cve":"CVE-2020-7637","score":0.01188,"percentile":0.67921,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-6gp3-h3jj-prx4","url":"https://osv.dev/vulnerability/GHSA-6gp3-h3jj-prx4","summary":"Prototype pollution in class-transformer","modified":"2026-07-08T06:49:53.325567657Z","packages":[{"ecosystem":"npm","name":"class-transformer","purl":"pkg:npm/class-transformer","ranges":["<0.3.1"],"fixed":["0.3.1"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}