CVE Watch15 jul 2026

CVE-2026-33228

flatted is a circular JSON parser. Prior to version 3.4.2, the parse() function in flatted can use attacker-controlled string values from th

CVSS

9.8

Crítico

EPSS

0.8%

p53

KEV

—

Exploit Today

0-100

Publicado: 20 mar 2026 · Última mod.: 15 jul 2026 · CWE-1321 · CWE-915

EPSS · 30d

0.7%EPSS · 30 días0.8%

2026-06-302026-07-16

Descripción técnica

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.

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