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5.3 Medium

CVE-2026-27125 svelte performance oriented web framework

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.

Affected products and versions

Product Affected versions Fixed in
svelte 5.51 earliest → < 5.51.5 5.51.5

References

Timeline

  1. Published
  2. Last modified

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