GHSA-j62c-4x62-9r35

Suggest an improvement
Source
https://github.com/advisories/GHSA-j62c-4x62-9r35
Import Source
https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/01/GHSA-j62c-4x62-9r35/GHSA-j62c-4x62-9r35.json
JSON Data
https://api.osv.dev/v1/vulns/GHSA-j62c-4x62-9r35
Aliases
Published
2026-01-15T18:09:59Z
Modified
2026-02-03T03:17:53.517839Z
Severity
  • 8.4 (High) CVSS_V4 - 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 CVSS Calculator
Summary
SvelteKit is vulnerable to denial of service and possible SSRF when using prerendering
Details

Summary

Versions of SvelteKit are vulnerable to a server side request forgery (SSRF) and denial of service (DoS) under certain conditions.

Details

Affected versions from 2.44.0 onwards are vulnerable to DoS if:

  • your app has at least one prerendered route (export const prerender = true)

Affected versions from 2.19.0 onwards are vulnerable to DoS and SSRF if:

  • your app has at least one prerendered route (export const prerender = true)
  • 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

Impact

The DoS causes the running server process to end.

The SSRF allows access to internal services that can be reached without authentication when fetched from SvelteKit's server runtime.

It is also possible to obtain an SXSS via cache poisoning, by forcing a potential CDN to cache an XSS returned by the attacker's server (the latter being able to specify the cache-control of their choice).

Credits

Database specific 
{
    "nvd_published_at": "2026-01-15T19:16:03Z",
    "github_reviewed_at": "2026-01-15T18:09:59Z",
    "github_reviewed": true,
    "severity": "HIGH",
    "cwe_ids": [
        "CWE-248",
        "CWE-400",
        "CWE-918"
    ]
}
References

Affected packages

npm / @sveltejs/kit

Package

Name
@sveltejs/kit
View open source insights on deps.dev
Purl
pkg:npm/%40sveltejs/kit

Affected ranges

Type
SEMVER
Events
Introduced
2.19.0
Fixed
2.49.5

Database specific

last_known_affected_version_range 
"<= 2.49.4"
source 
"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/01/GHSA-j62c-4x62-9r35/GHSA-j62c-4x62-9r35.json"

npm / @sveltejs/adapter-node

Package

Name
@sveltejs/adapter-node
View open source insights on deps.dev
Purl
pkg:npm/%40sveltejs/adapter-node

Affected ranges

Type
SEMVER
Events
Introduced
5.4.1
Fixed
5.5.1

Database specific

last_known_affected_version_range 
"<= 5.5.0"
source 
"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/01/GHSA-j62c-4x62-9r35/GHSA-j62c-4x62-9r35.json"