Answer in brief
CVE-2026-128123 records a Medium severity (CVSS 5.9) vulnerability in SvelteKit: `@sveltejs/adapter-node` crashes when proxying certain requests via `fetch`. The current sources do not mark it as known exploited. The current feed maps @sveltejs/adapter-node (generic), sveltejs/kit (generic), @sveltejs/adapter-node (npm), @sveltejs/adapter-node (npm) and additional mapped packages. Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 5.9. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps @sveltejs/adapter-node (generic), sveltejs/kit (generic), @sveltejs/adapter-node (npm), @sveltejs/adapter-node (npm) and additional mapped packages. Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| @sveltejs/adapter-nodegeneric | >=5.5.7 <5.5.8 || >=6.0.0-next.0 <6.0.1 | 5.5.8, 6.0.1 |
| sveltejs/kitgeneric | >=3.0.0-next.0 <3.1.1 || <2.70.4 | 2.70.4, 3.1.1 |
| @sveltejs/adapter-nodenpm | >=5.5.7,<5.5.8 | 5.5.8 |
| @sveltejs/adapter-nodenpm | >=6.0.0-next.0,<6.0.1 | 6.0.1 |
| @sveltejs/adapter-nodenpm | >=5.5.7,<5.5.8 | 5.5.8 |
| @sveltejs/adapter-nodenpm | >=6.0.0-next.0,<6.0.1 | 6.0.1 |
Published upstream
Nov 13, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Nov 13, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Nov 13, 2026
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.
Quoted source text, attributed separately from HOL analysis.