{"id":"AZL-80309","summary":"CVE-2026-33228 affecting package js-jquery 3.5.0-4","details":"flatted is a circular JSON parser. Prior to version 3.4.2, the parse() function in flatted can use attacker-controlled string values from the parsed JSON as direct array index keys, without validating that they are numeric. Since the internal input buffer is a JavaScript Array, accessing it with the key \"__proto__\" returns Array.prototype via the inherited getter. This object is then treated as a legitimate parsed value and assigned as a property of the output object, effectively leaking a live reference to Array.prototype to the consumer. Any code that subsequently writes to that property will pollute the global prototype. This issue has been patched in version 3.4.2.","modified":"2026-09-03T05:28:38Z","published":"2026-03-20T23:16:46Z","upstream":["CVE-2026-33228"],"references":[{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-33228"}],"affected":[{"package":{"name":"js-jquery","ecosystem":"Azure Linux:3","purl":"pkg:rpm/azure-linux/js-jquery"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"last_affected":"3.5.0-4"}]}],"database_specific":{"source":"https://github.com/microsoft/AzureLinuxVulnerabilityData/blob/main/osv/AZL-80309.json"}}],"schema_version":"1.9.0"}