{"id":"CVE-2026-107301","revision":"b2d7beae86a4446681a0bc239448aa7c","records":[{"revision":"b2d7beae86a4446681a0bc239448aa7c","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-107301","aliases":[],"title":"msgpack5: Partial options disable prototype protection","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":"2026-10-08T17:13:00.613+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":[]}],"coverage":[]}