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GHSA-866W-XMHQ-WJ7X

Vulnerability from github – Published: 2026-07-24 15:58 – Updated: 2026-07-24 15:58
VLAI
Summary
SvelteKit: Prototype pollution in file input deletion path in remote-function forms
Details

If you use remote form functions, have an input field of type file, and accept arbitrary user-controlled path names for the field, then you are vulnerable to a prototype pollution attack where the attacker can remove e.g. methods on the prototype.

Severity
4.3 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L
Show details on source website
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{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 2.69.0"
      },
      "package": {
        "ecosystem": "npm",
        "name": "@sveltejs/kit"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.69.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [],
  "database_specific": {
    "cwe_ids": [
      "CWE-1321"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-07-24T15:58:05Z",
    "nvd_published_at": null,
    "severity": "MODERATE"
  },
  "details": "If you use remote form functions, have an input field of type `file`, and accept arbitrary user-controlled path names for the field, then you are vulnerable to a prototype pollution attack where the attacker can remove e.g. methods on the prototype.",
  "id": "GHSA-866w-xmhq-wj7x",
  "modified": "2026-07-24T15:58:05Z",
  "published": "2026-07-24T15:58:05Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/sveltejs/kit/security/advisories/GHSA-866w-xmhq-wj7x"
    },
    {
      "type": "WEB",
      "url": "https://github.com/sveltejs/kit/pull/16218"
    },
    {
      "type": "WEB",
      "url": "https://github.com/sveltejs/kit/commit/df32f6fe86cdd0b68b650e3e4631e5896453dcd3"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/sveltejs/kit"
    },
    {
      "type": "WEB",
      "url": "https://github.com/sveltejs/kit/releases/tag/@sveltejs/kit@2.69.1"
    },
    {
      "type": "WEB",
      "url": "https://github.com/sveltejs/kit/releases/tag/@sveltejs/kit@3.0.0-next.7"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L",
      "type": "CVSS_V3"
    }
  ],
  "summary": "SvelteKit: Prototype pollution in file input deletion path in remote-function forms"
}



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