{"cve":"CVE-2021-26707","nvd":{"published":"2021-06-02T15:15:07.787","modified":"2026-06-17T03:43:41.690","status":"Modified","description":"The merge-deep library before 3.0.3 for Node.js can be tricked into overwriting properties of Object.prototype or adding new properties to it. These properties are then inherited by every object in the program, thus facilitating prototype-pollution attacks against applications using this library.","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/jonschlinkert/merge-deep/commit/11e5dd56de8a6aed0b1ed022089dbce6968d82a5","https://security.netapp.com/advisory/ntap-20210716-0008/","https://securitylab.github.com/advisories/GHSL-2020-160-merge-deep/","https://www.npmjs.com/package/merge-deep","https://github.com/jonschlinkert/merge-deep/commit/11e5dd56de8a6aed0b1ed022089dbce6968d82a5"],"products":["merge-deep_project:merge-deep","netapp:e-series_performance_analyzer"],"source":"nvd","synced_at":"2026-10-19T21:18:09.669877188+00:00"},"epss":{"cve":"CVE-2021-26707","score":0.01917,"percentile":0.79872,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-r6rj-9ch6-g264","url":"https://osv.dev/vulnerability/GHSA-r6rj-9ch6-g264","summary":"Prototype pollution in Merge-deep","modified":"2023-11-08T04:05:22.158205Z","packages":[{"ecosystem":"npm","name":"merge-deep","purl":"pkg:npm/merge-deep","ranges":["<3.0.3"],"fixed":["3.0.3"]}]}],"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."]}