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OpenAdvisories
Medium · 5.9 CVE-2026-128123 EUVD-2026-125768GHSA-rqw3-x7hx-mm3p

SvelteKit: `@sveltejs/adapter-node` crashes when proxying certain requests via `fetch`

Published Nov 13, 2026 · Assigned by GitHub_M

Description

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.

Affected products

VendorProductAffectedFixed
sveltejs kit >= 3.0.0-next.0, < 3.1.1, < 2.70.4 —
@sveltejs adapter-node >= 5.5.7, < 5.5.8, >= 6.0.0-next.0, < 6.0.1 —

Affected packages

EcosystemPackageAffectedFixedRecord
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 GHSA-rqw3-x7hx-mm3p

References