CVSS 3.1
5.9 mediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:HCVE-2026-128123 SvelteKit: `@sveltejs/adapter-node` crashes when proxying certain requests via `fetch`
Medium (5.9). Fixed in @sveltejs/adapter-node 5.5.8, 6.0.1.
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SvelteKit is a framework for rapidly developing robust, performant web applications using Svelte. From version 5.5.7 until versions 5.5.8 and 6.0.1, , @sveltejs/adapter-node can attempt to add a header to an immutable request in a context that causes the server to crash, denying service to any other requests routed to that server. This issue is fixed in 5.5.8 and 6.0.1.
Severity
- CWE
- CWE-248 Uncaught Exception
- OWASP Top 10
- A10:2025 Mishandling of Exceptional Conditions
- Published
- Modified
- Assigned by
- GitHub_M (CNA)
- NVD analysis
- Deferred: the NVD does not plan to analyze it
- Record from
- the NVD, synced
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Affected
- @sveltejs:adapter-node
- sveltejs:kit
Versions
From the CNA's record in the CVE List.
| Product | Affected |
|---|---|
| sveltejs kit | >= 3.0.0-next.0, < 3.1.1 |
| sveltejs kit | < 2.70.4 |
| @sveltejs adapter-node | >= 5.5.7, < 5.5.8 |
| @sveltejs adapter-node | >= 6.0.0-next.0, < 6.0.1 |
Fix and patched versions
@sveltejs/adapter-node(npm): fixed in 5.5.8, 6.0.1
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-rqw3-x7hx-mm3p | npm | @sveltejs/adapter-node | >=5.5.7 <5.5.8 | 5.5.8 |
| GHSA-rqw3-x7hx-mm3p | npm | @sveltejs/adapter-node | >=6.0.0-next.0 <6.0.1 | 6.0.1 |
History
- The NVD deferred its analysis
Changes since this site first stored the record. The same for every record: /api/public/changes.
References
- https://github.com/sveltejs/kit/commit/04756a1f7a4f73e34f1934895340a46de84fc164
- https://github.com/sveltejs/kit/commit/0a2e58cbccdd46cac20aa5af4e2edf17e0da11dd
- https://github.com/sveltejs/kit/pull/17620
- https://github.com/sveltejs/kit/releases/tag/@sveltejs/adapter-node@5.5.8
- https://github.com/sveltejs/kit/releases/tag/@sveltejs/adapter-node@6.0.1
- https://github.com/sveltejs/kit/security/advisories/GHSA-rqw3-x7hx-mm3p