CVE-2026-33228

A flaw was found in flatted, a JavaScript Object Notation JSON parser designed for handling circular data structures. A remote attacker can exploit this vulnerability by providing specially crafted JSON input. The parse function in flatted fails to properly validate string values used as array...

CVE-2026-33228 flatted: Prototype Pollution via parse()

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 th...