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OpenAdvisories
High · 7.9 CVE-2025-57820 EUVD-2025-25863GHSA-vj54-72f3-p5jv

Svelte devalue vulnerable to prototype pollution

Published Aug 26, 2025 · Updated Aug 27, 2025 · Assigned by GitHub_M

Description

Svelte devalue is a utility library. Prior to version 5.3.2, a string passed to devalue.parse could represent an object with a __proto__ property and devalue.parse does not check that an index is numeric. This could result in assigning prototypes to objects and properties, leading to prototype pollution. This issue has been fixed in version 5.3.2

Affected products

VendorProductAffectedFixed
sveltejs devalue < 5.3.2 —

Affected packages

EcosystemPackageAffectedFixedRecord
npm devalue < 5.3.2 5.3.2 GHSA-vj54-72f3-p5jv

References