{"cve":"CVE-2021-23561","nvd":{"published":"2021-12-10T20:15:08.303","modified":"2026-06-17T03:38:49.580","status":"Modified","description":"All versions of package comb are vulnerable to Prototype Pollution via the deepMerge() function.","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://snyk.io/vuln/SNYK-JS-COMB-1730083","https://snyk.io/vuln/SNYK-JS-COMB-1730083"],"products":["c2fo:comb"],"source":"nvd","synced_at":"2026-10-19T21:25:41.256909649+00:00"},"epss":{"cve":"CVE-2021-23561","score":0.0121,"percentile":0.6843,"date":"2026-11-01"},"kev":null,"osv":[{"id":"GHSA-vxr4-rxw7-g7v6","url":"https://osv.dev/vulnerability/GHSA-vxr4-rxw7-g7v6","summary":"Prototype Pollution in comb","modified":"2023-11-08T04:05:11.508643Z","packages":[{"ecosystem":"npm","name":"comb","purl":"pkg:npm/comb","ranges":["<=2.0.0"],"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."]}