{"cve":"CVE-2021-25953","nvd":{"published":"2021-07-14T11:15:07.820","modified":"2026-06-17T03:42:40.043","status":"Modified","description":"Prototype pollution vulnerability in 'putil-merge' versions1.0.0 through 3.6.6 allows 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://www.whitesourcesoftware.com/vulnerability-database/CVE-2021-25953","https://www.whitesourcesoftware.com/vulnerability-database/CVE-2021-25953"],"products":["putil-merge_project:putil-merge"],"source":"nvd","synced_at":"2026-10-19T21:21:13.713336758+00:00"},"epss":{"cve":"CVE-2021-25953","score":0.02961,"percentile":0.87211,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-9x7m-9hpg-xxmw","url":"https://osv.dev/vulnerability/GHSA-9x7m-9hpg-xxmw","summary":"Prototype Pollution in putil-merge","modified":"2023-11-08T04:05:18.445998Z","packages":[{"ecosystem":"npm","name":"putil-merge","purl":"pkg:npm/putil-merge","ranges":[">=1.0.0 <3.7.0"],"fixed":["3.7.0"]}]}],"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."]}