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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 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.

CVSS 4.0 · 8.9 High EPSS < 1% KEV · Not listed
Vendors
Webreflection
Products
Flatted
CVE-2026-32141

flatted: Unbounded recursion DoS in parse() revive phase

flatted is a circular JSON parser. Prior to 3.4.0, flatted's parse() function uses a recursive revive() phase to resolve circular references in deserialized JSON. When given a crafted payload with deeply nested or self-referential $ indices, the recursion depth is unbounded, causing a stack overflow that crashes the Node.js process. This vulnerability is fixed in 3.4.0.

CVSS 3.1 · 7.5 High EPSS < 1% KEV · Not listed
Vendors
Webreflection
Products
Flatted