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This issue is fixed in version 6.1.0.","state":0,"publishedAt":"2026-10-08T17:13:00.613+00:00","modifiedAt":"2026-10-14T01:02:53.277+00:00","affected":[{"ecosystem":"Vendor product","name":"msgpack5","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"mcollina\",\n                    \"product\": \"msgpack5\",\n                    \"versions\": [\n                        {\n                            \"version\": \"< 6.1.0\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","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/security/advisories/GHSA-8hq7-ggx2-cc6m","https://github.com/mcollina/msgpack5/commit/20e82600ac9462e679c8a45e5723315f21e2c774","https://github.com/mcollina/msgpack5/releases/tag/v6.1.0"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-107301","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-107301","identifiers":["CVE-2026-107301"]},"retained":false,"historicalAffected":[]},{"revision":"befe7981c0be430d930ed7aa5a0d4918","observedAt":"2026-11-09T05:07:39.33+00:00","statement":{"source":"euvd","id":"EUVD-2026-95112","aliases":["CVE-2026-107301","GHSA-8hq7-ggx2-cc6m"],"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. 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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":[]},{"revision":"4c6588c005624dffb915e2b971a872cf","observedAt":"2026-10-24T13:17:17.793+00:00","statement":{"source":"osv","id":"GHSA-8hq7-ggx2-cc6m","aliases":["CVE-2026-107301"],"title":"msgpack5: Partial options disable prototype protection","description":"### Impact\n\nPassing an empty or partial options object disables the default `protoAction: 'error'` protection. A map containing a `__proto__` key can then replace the prototype of the decoded object, potentially changing inherited properties or causing unexpected behavior in downstream code.\n\nOnly the decoded object's prototype is affected; this does not modify `Object.prototype` globally.\n\n### Patches\n\nOptions are now merged with secure defaults without modifying the caller's object. Unsupported `protoAction` values are rejected.\n\n### Workarounds\n\nExplicitly set `protoAction: 'error'` whenever constructing a msgpack5 instance, and validate decoded values before use.","state":0,"publishedAt":"2026-10-08T17:39:57+00:00","modifiedAt":"2026-10-08T18:00:08.8992869+00:00","affected":[{"ecosystem":"npm","name":"msgpack5","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"},{"kind":"fixed","version":"6.1.0"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V3","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:L","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"MODERATE"}],"references":["https://github.com/mcollina/msgpack5/security/advisories/GHSA-8hq7-ggx2-cc6m","https://github.com/mcollina/msgpack5/commit/20e82600ac9462e679c8a45e5723315f21e2c774","https://github.com/mcollina/msgpack5","https://github.com/mcollina/msgpack5/releases/tag/v6.1.0"],"sourceUrl":"https://github.com/advisories/GHSA-8hq7-ggx2-cc6m","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-8hq7-ggx2-cc6m","identifiers":["GHSA-8hq7-ggx2-cc6m","CVE-2026-107301"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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