{"id":"CVE-2021-23426","aliases":["EUVD-2021-1982","GHSA-58g2-9fqr-36q2"],"status":"published","title":"Prototype Pollution","description":"This affects all versions of package Proto. It is possible to inject pollute the object property of an application using Proto by leveraging the merge function.","severity":{"version":"3.1","score":5.6,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L/E:P/RL:U/RC:C","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-12","score":0.00861,"percentile":0.59019,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-1321"],"published":"2021-09-01T14:25:10Z","modified":"2026-06-17T03:38:44Z","affected":[{"source":"ghsa","ecosystem":"npm","package":"Proto","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"last_affected":"1.1.4"}]}]},{"source":"osv","ecosystem":"npm","package":"Proto","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"last_affected":"1.1.4"}]}]}],"products":[{"vendor":"proto_project","product":"proto"}],"references":[{"url":"https://snyk.io/vuln/SNYK-JS-PROTO-1316301","tags":["x_refsource_MISC","x_transferred","Exploit","Mitigation","Third Party Advisory","web"]},{"url":"https://www.npmjs.com/package/Proto","tags":["x_refsource_MISC","x_transferred","Product","Third Party Advisory","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-23426","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-58g2-9fqr-36q2"},{"url":"https://github.com/adriancmiranda/Proto","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2021-23426","title":"Prototype Pollution","description":"This affects all versions of package Proto. It is possible to inject pollute the object property of an application using Proto by leveraging the merge function.","status":"published","published":"2021-09-01T14:25:10.624Z","modified":"2024-09-16T23:16:46.634Z","cvss":[{"version":"3.1","score":5.6,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L/E:P/RL:U/RC:C","level":"medium","assessor":"cna"}],"updated_at":"2026-11-02T14:33:00.488332Z"}],"euvd":[{"id":"EUVD-2021-1982","description":"This affects all versions of package Proto. It is possible to inject pollute the object property of an application using Proto by leveraging the merge function.","status":"published","published":"2021-09-01T14:25:10Z","modified":"2024-09-16T23:16:46Z","cvss":[{"version":"3.1","score":5.6,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L/E:P/RL:U/RC:C","level":"medium"}],"updated_at":"2026-11-03T00:54:54.692655Z"}],"ghsa":[{"id":"GHSA-58g2-9fqr-36q2","title":"Prototype Pollution in Proto","description":"This affects all versions of package Proto. It is possible to inject pollute the object property of an application using Proto by leveraging the merge function.","status":"published","published":"2021-09-02T22:01:01Z","modified":"2023-02-01T05:06:24Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","level":"high"}],"cwes":["CWE-1321"],"updated_at":"2026-11-02T14:36:39.086869Z"}],"nvd":[{"id":"CVE-2021-23426","description":"This affects all versions of package Proto. It is possible to inject pollute the object property of an application using Proto by leveraging the merge function.","status":"published","published":"2021-09-01T15:15:08.373Z","modified":"2026-06-17T03:38:44.507Z","cvss":[{"version":"3.1","score":5.6,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L","level":"medium","assessor":"secondary"},{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","level":"high","assessor":"primary"},{"version":"2.0","score":5,"vector":"AV:N/AC:L/Au:N/C:N/I:P/A:N","level":"medium","assessor":"primary"}],"updated_at":"2026-11-02T14:06:57.67549Z"}],"osv":[{"id":"GHSA-58g2-9fqr-36q2","title":"Prototype Pollution in Proto","description":"This affects all versions of package Proto. It is possible to inject pollute the object property of an application using Proto by leveraging the merge function.","status":"published","published":"2021-09-02T22:01:01Z","modified":"2023-11-08T04:05:08.99142Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","level":"high"}],"cwes":["CWE-1321"],"updated_at":"2026-11-02T15:46:38.213481Z"}]}}