{"id":"AZL-106857","summary":"CVE-2026-107301 affecting package msgpack 3.3.0-1","details":"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.","modified":"2026-10-11T05:36:19Z","published":"2026-10-08T17:17:16Z","upstream":["CVE-2026-107301"],"references":[{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-107301"}],"affected":[{"package":{"name":"msgpack","ecosystem":"Azure Linux:3","purl":"pkg:rpm/azure-linux/msgpack"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"last_affected":"3.3.0-1"}]}],"database_specific":{"source":"https://github.com/microsoft/AzureLinuxVulnerabilityData/blob/main/osv/AZL-106857.json"}}],"schema_version":"1.9.0"}