CVE-2025-57820
Unknown Unknown - Not Provided
BaseFortify

Publication date: 2025-08-26

Last updated on: 2025-08-29

Assigner: GitHub, Inc.

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
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Meta Information
Published
2025-08-26
Last Modified
2025-08-29
Generated
2026-06-16
AI Q&A
2025-08-27
EPSS Evaluated
2026-06-15
NVD
CVE-2025-57820
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
sveltejs devalue *
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-1321 The product receives input from an upstream component that specifies attributes that are to be initialized or updated in an object, but it does not properly control modifications of attributes of the object prototype.
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Executive Summary

This vulnerability exists in the Svelte devalue utility library prior to version 5.3.2. When a string passed to devalue.parse represents an object containing a __proto__ property, and the function does not verify that an index is numeric, it can lead to prototype pollution. This means an attacker could manipulate the prototype of objects, potentially altering their behavior or properties unexpectedly.

Impact Analysis

The vulnerability can allow an attacker to perform prototype pollution, which may lead to unexpected behavior in applications using the affected library. This could result in security issues such as privilege escalation, data manipulation, or application crashes depending on how the polluted prototypes are used within the application.

Mitigation Strategies

Upgrade the Svelte devalue library to version 5.3.2 or later, as this version contains the fix for the prototype pollution vulnerability in devalue.parse.

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