CVE-2025-57820

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

Weakness Type (CWE)

CWE-1321 CWE-1321

References

Other References

https://github.com/sveltejs/devalue/commit/0623a47c9555b639c03ff1baea82951b2d9d1132 https://github.com/sveltejs/devalue/security/advisories/GHSA-vj54-72f3-p5jv

Frequently Asked Questions

What is CVE-2025-57820? +

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

How do I check if I'm vulnerable to CVE-2025-57820? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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