{"cve":"CVE-2021-23452","nvd":{"published":"2021-10-20T13:15:07.537","modified":"2026-06-17T03:38:47.380","status":"Modified","description":"This affects all versions of package x-assign. The global proto object can be polluted using the __proto__ object.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","score":9.8},"cwes":["CWE-1321"],"references":["https://runkit.com/embed/sq8qjwemyn8t","https://snyk.io/vuln/SNYK-JS-XASSIGN-1759314","https://runkit.com/embed/sq8qjwemyn8t","https://snyk.io/vuln/SNYK-JS-XASSIGN-1759314"],"products":["binaryops:x-assign"],"source":"nvd","synced_at":"2026-10-19T21:24:39.218183596+00:00"},"epss":{"cve":"CVE-2021-23452","score":0.0155,"percentile":0.75085,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-4mvj-rq4v-2fxw","url":"https://osv.dev/vulnerability/GHSA-4mvj-rq4v-2fxw","summary":"Prototype Pollution in x-assign","modified":"2023-11-08T04:05:10.522314Z","packages":[{"ecosystem":"npm","name":"x-assign","purl":"pkg:npm/x-assign","ranges":["<=0.1.4"],"fixed":[]}]}],"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."]}