{
  "canonical_id": "sveltekit--GHSA-fpg4-jhqr-589c",
  "system_id": "sveltekit",
  "display_name": "SvelteKit",
  "category": "frameworks",
  "advisory_mode": "core",
  "title": "SvelteKit  has deserialization expansion in unvalidated `form` remote function leading to Denial of Service (experimental only)",
  "summary": "Some relatively small inputs can cause very large files arrays in `form` handlers. If the SvelteKit application code doesn't check `files.length` or individual files' sizes and performs expensive processing with them, it can result in Denial of Service.\n\nOnly users with `experimental.remoteFunctions: true` who are using the `form` function and are processing the `files` array without validation are vulnerable.",
  "published_at": "2026-02-28T02:04:39Z",
  "updated_at": "2026-02-28T06:27:26.115188Z",
  "severity": "medium",
  "cvss_score": 4.0,
  "exploit_status": "unknown",
  "source_confidence": "official",
  "official_source_url": "https://github.com/sveltejs/kit/security/advisories/GHSA-fpg4-jhqr-589c",
  "secondary_source_urls": [
    "https://github.com/sveltejs/kit/commit/faba869db3644077169bf5d7c6e41fd5f3d6c65e",
    "https://github.com/sveltejs/kit",
    "https://github.com/sveltejs/kit/releases/tag/@sveltejs/kit@2.53.3"
  ],
  "aliases": [
    "GHSA-fpg4-jhqr-589c"
  ],
  "cve_ids": [],
  "ghsa_ids": [
    "GHSA-fpg4-jhqr-589c"
  ],
  "osv_ids": [
    "GHSA-fpg4-jhqr-589c"
  ],
  "affected_versions": [
    "introduced=2.49.0, fixed<2.53.3"
  ],
  "fixed_versions": [
    "2.53.3"
  ],
  "package_name": "@sveltejs/kit",
  "render_markdown": true,
  "case_path": "07-framework-security/frameworks/sveltekit/cases/sveltekit-ghsa-fpg4-jhqr-589c.md",
  "secure_code_topics": [
    "authz-server-side-recheck",
    "token-cookie-storage",
    "deserialization-safety"
  ],
  "status": "generated",
  "triage_reasons": [],
  "verification_status": "triage-manual",
  "verification_mode": "synthetic",
  "last_verified_at": null,
  "last_run_id": null,
  "evidence_bundle": null,
  "historical_status": null,
  "latest_status": null,
  "browser_evidence": {
    "required": false,
    "present": false,
    "refs": []
  },
  "repro_profile_id": "deserialization-generic",
  "artifact_mode": "synthetic",
  "blocked_reason": null,
  "metadata": {
    "source_names": [
      "OSV SvelteKit"
    ],
    "source_kinds": [
      "osv-batch"
    ],
    "candidate_count": 1
  }
}