CVE-2025-62381
Unknown Unknown - Not Provided
BaseFortify

Publication date: 2025-10-15

Last updated on: 2025-10-16

Assigner: GitHub, Inc.

Description
sveltekit-superforms makes SvelteKit forms a pleasure to use. sveltekit-superforms v2.27.3 and prior are susceptible to a prototype pollution vulnerability within the parseFormData function of formData.js. An attacker can inject string and array properties into Object.prototype, leading to denial of service, type confusion, and potential remote code execution in downstream applications that rely on polluted objects. This vulnerability is fixed in 2.27.4.
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Meta Information
Published
2025-10-15
Last Modified
2025-10-16
Generated
2026-06-16
AI Q&A
2025-10-15
EPSS Evaluated
2026-06-15
NVD
CVE-2025-62381
EUVD
EUVD-2025-34681
Affected Vendors & Products
Showing 2 associated CPEs
Vendor Product Version / Range
ciscoheat sveltekit-superforms 2.27.3
ciscoheat sveltekit-superforms 2.27.4
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

The vulnerability is a prototype pollution issue in sveltekit-superforms versions 2.27.3 and earlier. It occurs in the parseFormData function of formData.js, where an attacker can inject string and array properties into Object.prototype. This manipulation can lead to denial of service, type confusion, and potentially remote code execution in applications that use the polluted objects.

Impact Analysis

This vulnerability can impact you by allowing attackers to cause denial of service, create type confusion errors, or even execute remote code in downstream applications that rely on the polluted objects. This can compromise the availability, integrity, and security of your application.

Mitigation Strategies

Upgrade sveltekit-superforms to version 2.27.4 or later, as this version contains the fix for the prototype pollution vulnerability in the parseFormData function.

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