{"cve":"CVE-2021-25948","nvd":{"published":"2021-06-10T12:15:08.607","modified":"2026-06-17T03:42:39.637","status":"Modified","description":"Prototype pollution vulnerability in 'expand-hash' versions 0.1.0 through 1.0.1 allows an attacker to cause a denial of service and may lead to remote code execution.","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://github.com/doowb/expand-hash/blob/556913f6c2f05848110b5b8261cfc78e5ce3dc77/index.js#L19","https://www.whitesourcesoftware.com/vulnerability-database/CVE-2021-25948","https://github.com/doowb/expand-hash/blob/556913f6c2f05848110b5b8261cfc78e5ce3dc77/index.js#L19","https://www.whitesourcesoftware.com/vulnerability-database/CVE-2021-25948"],"products":["expand-hash_project:expand-hash"],"source":"nvd","synced_at":"2026-10-19T21:20:07.141963181+00:00"},"epss":{"cve":"CVE-2021-25948","score":0.03299,"percentile":0.8852,"date":"2026-11-01"},"kev":null,"osv":[{"id":"GHSA-x3wr-v4wx-5qpc","url":"https://osv.dev/vulnerability/GHSA-x3wr-v4wx-5qpc","summary":"Prototype Pollution","modified":"2023-11-08T04:05:18.201025Z","packages":[{"ecosystem":"npm","name":"expand-hash","purl":"pkg:npm/expand-hash","ranges":["<=1.0.1"],"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."]}