CVE-2026-27125
Svelte SSR attribute spreading includes inherited properties from prototype chain
CVSS Score
0.0
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-915 |
| Vendor | sveltejs |
| Product | svelte |
| Published | Feb 20, 2026 |
| Last Updated | Feb 25, 2026 |
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Affected Versions
sveltejs / svelte
< 5.51.5