CVE-2026-82257

Medium

Description

SvelteKit versions before 2.69.1 contain a prototype pollution vulnerability in remote form functions with file input fields that accept arbitrary user-controlled path names. Attackers can manipulate the deletion path to remove methods on the prototype, potentially disabling application functionality.

SeverityMedium

CVSS4.3

Exploit probability—

Product

Sveltekit

PublishedAug 28, 2026

First seenAug 28, 2026

Weakness typeCWE-1321Prototype pollution

How to fix

Update

svelte sveltekit2.69.1 or later
@sveltejs/kit2.69.1 or later

Vendor advisories

github.com/sveltejs/kit/security/advisories/GHSA-866w-xmhq-wj7x

Affected products

Product	Affected versions	Fixed in
svelte sveltekit	v < 2.69.1	2.69.1
@sveltejs/kitnpm	v < 2.69.1	2.69.1

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