{"id":"CVE-2026-107301","revision":"697b6a641b0849cf8769611b55485d07","records":[{"revision":"697b6a641b0849cf8769611b55485d07","observedAt":"2026-10-25T05:17:13.11+00:00","statement":{"source":"nvd","id":"CVE-2026-107301","aliases":[],"title":"msgpack5 is a msgpack v5 implementation for node.js and the browser. Prior to 6.1.0, constructing msgpack5 with an empty or partial options object disables the default protoAction: 'error' protection. A decoded map containing a __proto__ ke…","description":"msgpack5 is a msgpack v5 implementation for node.js and the browser. Prior to 6.1.0, constructing msgpack5 with an empty or partial options object disables the default protoAction: 'error' protection. A decoded map containing a __proto__ key can then replace the decoded object's prototype, potentially changing inherited properties or downstream behavior, although Object.prototype is not modified globally. This issue is fixed in version 6.1.0.","state":0,"publishedAt":"2026-10-08T17:17:16.143+00:00","modifiedAt":"2026-10-14T01:17:05.583+00:00","affected":[],"metrics":[{"system":"CVSS 3.1 · security-advisories@github.com · Secondary","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:L","score":6.5,"severity":"MEDIUM"}],"references":["https://github.com/mcollina/msgpack5/commit/20e82600ac9462e679c8a45e5723315f21e2c774","https://github.com/mcollina/msgpack5/releases/tag/v6.1.0","https://github.com/mcollina/msgpack5/security/advisories/GHSA-8hq7-ggx2-cc6m"],"sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-107301","license":"NIST NVD usage terms; underlying source attribution retained","enrichment":{"sourceStatus":"Deferred","weaknesses":["CWE-1321"],"productCriteria":[],"sourceDates":{"published":"2026-10-08T17:17:16.143","lastModified":"2026-10-14T01:17:05.583"},"relatedAdvisories":[],"note":"NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON."},"key":"nvd:CVE-2026-107301","identifiers":["CVE-2026-107301"]},"retained":false,"historicalAffected":[]}],"coverage":[]}