MediumGHSA-h7h7-mm68-gmrcCVE-2026-27119

Svelte affected by XSS in SSR `<option>` element

Published 19 Feb 2026 · Updated 23 Feb 2026

Affected package

Affected: >=5.39.3 <5.51.5
Fixed in: 5.51.5

Update to the fixed version for your release line, for example:npm install svelte@5.51.5

Details

In certain circumstances, the server-side rendering output of an <option> element does not properly escape its content, potentially allowing HTML injection in the SSR output. Client-side rendering is not affected.

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References

Linkgithub.com/sveltejs/svelte/security/advisories/GHSA-h7h7-mm68-gmrc
Advisorynvd.nist.gov/vuln/detail/CVE-2026-27119
Packagegithub.com/sveltejs/svelte

Advisory data from OSV.dev (opens OSV.dev in a new tab), refreshed daily.