PT-2026-26465 · Flatted · Flatted
Yohannslm
·
Publicado
2026-03-19
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Atualizado
2026-06-04
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CVE-2026-33228
CVSS v3.1
9.8
Crítica
| Vetor | AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
Name of the Vulnerable Software and Affected Versions
flatted versions prior to 3.4.2
Description
flatted is a circular JSON parser. The
parse() function does not validate that string values from the parsed JSON used as array index keys are numeric. This allows attacker-controlled strings, such as " proto ", to be used as keys, accessing Array.prototype via the inherited getter. This prototype is then treated as a parsed value and assigned to the output object, leaking a live reference to Array.prototype to the consumer. Subsequent writes to this property can pollute the global prototype chain. The issue resides in the esm/index.js file, specifically within the resolver function, where the input array is accessed using a potentially unsafe key value. The vulnerable code does not ensure that value is a valid numeric index before accessing the input array. This can lead to denial of service or code execution.Recommendations
versions prior to 3.4.2: Upgrade to version 3.4.2 or later to resolve this issue.
Exploit
Correção
Prototype Pollution
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Enumeração de Fraquezas
Identificadores relacionados
Produtos afetados
Flatted