Description
svelte performance oriented web framework. Prior to 5.51.5, in server-side rendering, attribute spreading on elements (e.g.
) enumerates inherited properties from the objects prototype chain rather than only own properties. In environments where Object.prototype has already been polluted — a precondition outside of Sveltes control — this can cause unexpected attributes to appear in SSR output or cause SSR to throw errors. Client-side rendering is not affected. This vulnerability is fixed in 5.51.5.