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I. Basic Information for CVE-2026-33228
Vulnerability Information

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Vulnerability Title
flatted: Prototype Pollution via parse()
Source: NVD (National Vulnerability Database)
Vulnerability Description
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.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
CWE-1321
Source: NVD (National Vulnerability Database)
Vulnerability Title
flatted 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
flatted是Andrea Giammarchi个人开发者的一个轻量快速的循环JSON解析器。 flatted 3.4.2之前版本存在安全漏洞,该漏洞源于parse函数未验证攻击者控制的字符串值是否为数字,可能导致原型污染。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
VendorProductAffected VersionsCPESubscribe
WebReflectionflatted < 3.4.2 -
II. Public POCs for CVE-2026-33228
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III. Intelligence Information for CVE-2026-33228
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