CVE-2026-27125

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.

References

https://github.com/sveltejs/svelte/security/advisories/GHSA-crpf-4hrx-3jrp

https://github.com/sveltejs/svelte/releases/tag/[email protected]

https://github.com/sveltejs/svelte/commit/73098bb26c6f06e7fd1b0746d817d2c5ee90755f

Details

Source: Mitre, NVD

Risk Information

CVSS v2

CVSS v3

CVSS v4