Description
svelte performance oriented web framework. Prior to 5.51.5, 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. This vulnerability is fixed in 5.51.5.
Problem types
CWE-915: Improperly Controlled Modification of Dynamically-Determined Object Attributes
Product status
References
github.com/...svelte/security/advisories/GHSA-crpf-4hrx-3jrp
github.com/...ommit/73098bb26c6f06e7fd1b0746d817d2c5ee90755f
github.com/sveltejs/svelte/releases/tag/svelte@5.51.5