{"cve":"CVE-2021-23470","nvd":{"published":"2022-02-04T20:15:08.363","modified":"2026-06-17T03:38:47.720","status":"Modified","description":"This affects the package putil-merge before 3.8.0. The merge() function does not check the values passed into the argument. An attacker can supply a malicious value by adjusting the value to include the constructor property. Note: This vulnerability derives from an incomplete fix in https://security.snyk.io/vuln/SNYK-JS-PUTILMERGE-1317077","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/panates/putil-merge/commit/476d00078dfb2827d7c9ee0f2392c81b864f7bc5","https://snyk.io/vuln/SNYK-JS-PUTILMERGE-2391487","https://github.com/panates/putil-merge/commit/476d00078dfb2827d7c9ee0f2392c81b864f7bc5","https://snyk.io/vuln/SNYK-JS-PUTILMERGE-2391487"],"products":["putil-merge_project:putil-merge"],"source":"nvd","synced_at":"2026-10-19T21:27:20.926095847+00:00"},"epss":{"cve":"CVE-2021-23470","score":0.01266,"percentile":0.69742,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-4g77-cvgw-grvw","url":"https://osv.dev/vulnerability/GHSA-4g77-cvgw-grvw","summary":"Prototype Pollution in putil-merge","modified":"2026-07-08T06:49:37.509092097Z","packages":[{"ecosystem":"npm","name":"putil-merge","purl":"pkg:npm/putil-merge","ranges":["<3.8.0"],"fixed":["3.8.0"]}]}],"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."]}