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TI-2025-41390 Aliases CVE-2025-67647GHSA-j62c-4x62-9r35

SvelteKit Denial of service and possible SSRF when using prerendering

Priority MEDIUM 43CWE-248Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
Present
Impact type
Denial of service
Confidentiality · integrity · availability
High · Low · High
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub. Impact type from CWE-248.

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00517 44th percentileScored 2026-11-07
Fix Fixed kit (sveltejs): 2.49.5@sveltejs/kit (npm): 2.49.5+1 more product

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
sveltejskit2.19.0 to before 2.49.52.49.5Patch availableCNA
—@sveltejs/kit (npm)2.19.0 to before 2.49.52.49.5Patch availableGHSA-j62c-4x62-9r35
—@sveltejs/adapter-node (npm)5.4.1 to before 5.5.15.5.1Patch availableGHSA-j62c-4x62-9r35
  • kit Vendorsveltejs Affected 2.19.0 to before 2.49.5 Fixed in 2.49.5 Patch available CNA
  • @sveltejs/kit (npm) Vendor— Affected 2.19.0 to before 2.49.5 Fixed in 2.49.5 Patch available GHSA-j62c-4x62-9r35
  • @sveltejs/adapter-node (npm) Vendor— Affected 5.4.1 to before 5.5.1 Fixed in 5.5.1 Patch available GHSA-j62c-4x62-9r35

CPE configurations NVD · 2

CPEVersionsRoleVendor
cpe:2.3:a:svelte:adapter-node:*:*:*:*:*:node.js:*:*5.4.1 to before 5.5.1Vulnerablesveltejs
cpe:2.3:a:svelte:kit:*:*:*:*:*:node.js:*:*2.19.0 to before 2.49.5Vulnerablesveltejs
  • cpe:2.3:a:svelte:adapter-node:*:*:*:*:*:node.js:*:* Versions 5.4.1 to before 5.5.1 Vulnerable ·sveltejs
  • cpe:2.3:a:svelte:kit:*:*:*:*:*:node.js:*:* Versions 2.19.0 to before 2.49.5 Vulnerable ·sveltejs

Remediation

  • Fix · CNA kit (sveltejs) Fixed in 2.49.5
  • Fix · GHSA-j62c-4x62-9r35 @sveltejs/kit (npm) Fixed in 2.49.5 Advisory →
  • Fix · GHSA-j62c-4x62-9r35 @sveltejs/adapter-node (npm) Fixed in 5.5.1 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2025-67647
  2. 2026-10-03 Alias added: GHSA-j62c-4x62-9r35

References

Patch 1

Advisory 2

Other 3

  • TI-2024-15660 Sending a GET or HEAD request with a body crashes SvelteKit CVSS 3.1HIGH 7.5

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences