---
id: CVE-2026-82257
title: >-
  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
summary: >-
  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 o…
severity: medium
cvss: 4.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L'
cwe:
  - CWE-1321
vendor: svelte
product: sveltekit
affected:
  - sveltekit < 2.69.1
patched:
  - sveltekit 2.69.1
published: '2026-08-28'
updated: '2026-10-08'
sourceUpdated: '2026-10-08T16:17:48.293'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-82257'
references:
  - url: 'https://github.com/sveltejs/kit/security/advisories/GHSA-866w-xmhq-wj7x'
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/sveltekit-before-2.69.1-prototype-pollution-via-file-input
    label: disclosure@vulncheck.com
tags:
  - nvd
  - cve.org
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-08-28T13:58:20.486385Z'
epss: 0.00358
epssPercentile: 0.27427
ingestedAt: '2026-10-08T16:52:14.733Z'
---

## Overview

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.

## Affected

- `sveltekit < 2.69.1`

## Remediation

Upgrade past the affected range:

- `sveltekit 2.69.1`