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GHSA-crpf-4hrx-3jrp

Svelte SSR attribute spreading includes inherited properties from prototype chain

Source: GitHub Advisory Database (reviewed) Moderate CVE-2026-27125

Packages

EcosystemPackageAffectedFixed in
npm svelte < 5.51.5 5.51.5

Details

As written in the advisory (Markdown source, shown as plain text).

In server-side rendering, attribute spreading on elements (e.g. `<div {...attrs}>`) enumerates inherited properties from the object's prototype chain rather than only own properties. In environments where `Object.prototype` has already been polluted — a precondition outside of Svelte's control — this can cause unexpected attributes to appear in SSR output or cause SSR to throw errors. Client-side rendering is not affected.

References

External links from the advisory. They lead to third-party sites.