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Advisories

Sveltejs devalue before 5.6.4 Prototype Injection via parse and unflatten

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Severity
medium
Date
Affecting

  • devalue >= 0, < 5.6.4

CWE
  • CWE-1321 Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')
CVSS
6.3
CVSS V4 Vector
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
Credit
elliott-with-the-longest-name-on-github, KarimPwnz, wim-vercel, mattiasljungstrom
Description
Sveltejs devalue before 5.6.4 contains a prototype injection vulnerability that allows attackers to inject __proto__ own properties into objects returned by devalue.parse and devalue.unflatten. Attackers can supply crafted serialized input that, when downstream code merges results via Object.assign, alters the target object's prototype.

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