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SvelteKit Denial of service and possible SSRF when using prerendering

Type: advisorySources: OSV

SvelteKit is a framework for rapidly developing robust, performant web applications using Svelte. Prior to 2.49.5, SvelteKit is vulnerable to a server side request forgery (SSRF) and denial of service (DoS) under certain conditions. From 2.44.0 through 2.49.4, the vulnerability results in a DoS when your app has at least one prerendered route (export const prerender = true). From 2.19.0 through 2.49.4, the vulnerability results in a DoS when your app has at least one prerendered route and you are using adapter-node without a configured ORIGIN environment variable, and you are not using a reverse proxy that implements Host header validation. This vulnerability is fixed in 2.49.5.

Products
Not specified
Affected versions
Not specified
Fixed versions
Not specified
CVEs
CVE-2025-67647
Confirmed fixed CVEs
Not specified
Updated in this feed
3 Nov 2026, 15:53 UTC · Revision 1

Source evidence

SvelteKit Denial of service and possible SSRF when using prerendering

core-osv · Original source

Published 15 Jan 2026, 18:33 UTC

SvelteKit is a framework for rapidly developing robust, performant web applications using Svelte. Prior to 2.49.5, SvelteKit is vulnerable to a server side request forgery (SSRF) and denial of service (DoS) under certain conditions. From 2.44.0 through 2.49.4, the vulnerability results in a DoS when your app has at least one prerendered route (export const prerender = true). From 2.19.0 through 2.49.4, the vulnerability results in a DoS when your app has at least one prerendered route and you are using adapter-node without a configured ORIGIN environment variable, and you are not using a reverse proxy that implements Host header validation. This vulnerability is fixed in 2.49.5.

osv:CVE-2025-67647
Complete source record
{
  "id": "40697bbb821f4cfed64833b3dff8cb331d68b03e807a54fa856a1f86fb1fbd79",
  "url": "https://osv.dev/vulnerability/CVE-2025-67647",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "SvelteKit Denial of service and possible SSRF when using prerendering",
    "summary": "SvelteKit is a framework for rapidly developing robust, performant web applications using Svelte. Prior to 2.49.5, SvelteKit is vulnerable to a server side request forgery (SSRF) and denial of service (DoS) under certain conditions. From 2.44.0 through 2.49.4, the vulnerability results in a DoS when your app has at least one prerendered route (export const prerender = true). From 2.19.0 through 2.49.4, the vulnerability results in a DoS when your app has at least one prerendered route and you are using adapter-node without a configured ORIGIN environment variable, and you are not using a reverse proxy that implements Host header validation. This vulnerability is fixed in 2.49.5.",
    "evidence": "osv:CVE-2025-67647",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2025-67647",
      "aliases": [
        "CVE-2025-67647",
        "GHSA-j62c-4x62-9r35"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:L/VA:H/SC:L/SI:L/SA:N"
        }
      ],
      "affected": [
        {
          "ranges": [
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              "type": "GIT",
              "events": [
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                  "introduced": "43544107269013e8b5160d268da25f1e003b6f6f"
                },
                {
                  "fixed": "c89805e4a4af14859d44f625bd83344e3d1a08b0"
                },
                {
                  "introduced": "d6f9beb825034ba239eed2d5e76fcb728fb8369f"
                },
                {
                  "fixed": "80ffb53382e397a8fc83e6b63d2675eeabb427bd"
                },
                {
                  "fixed": "d9ae9b00b14f5574d109f3fd548f960594346226"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:svelte:adapter-node:*:*:*:*:*:node.js:*:*",
                    "range": [
                      {
                        "introduced": "5.4.1"
                      },
                      {
                        "fixed": "5.5.1"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "cpe": "cpe:2.3:a:svelte:kit:*:*:*:*:*:node.js:*:*",
                    "range": [
                      {
                        "introduced": "2.19.0"
                      },
                      {
                        "fixed": "2.49.5"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "range": [
                      {
                        "fixed": "d9ae9b00b14f5574d109f3fd548f960594346226"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
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          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-67647.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:30.371098882Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/67xxx/CVE-2025-67647.json",
        "https://github.com/sveltejs/kit/security/advisories/GHSA-j62c-4x62-9r35",
        "https://nvd.nist.gov/vuln/detail/CVE-2025-67647",
        "https://github.com/sveltejs/kit/commit/d9ae9b00b14f5574d109f3fd548f960594346226"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-248",
          "CWE-918"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/67xxx/CVE-2025-67647.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2025-67647",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 497031,
  "published_at": "2026-01-15T18:33:25.295+00:00"
}