CVE-2026-27125 – Svelte SSR attribute spreading includes inherited properties from prototype chain

CVE ID : CVE-2026-27125

Published : Feb. 20, 2026, 10:29 p.m. | 33 minutes ago

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 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.

Severity: 0.0 | NA

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