CVE-2026-42573
Svelte Vulnerable to XSS via DOM Clobbering of Internal Framework State
EPSS 0.32%
Description
Svelte was vulnerable to DOM clobbering of its internal framework state on elements, potentially leading to XSS attacks. You are vulnerable if all of the following is true: - you are using attribute spreading on a form element - you are using attribute spreading or allow a dynamic value for the `name` attribute on an input or button element within that form - both of these are simultaneously user-controllable ```svelte <form {...spread1}> <input {...spread2}> </form> ```
How to fix CVE-2026-42573
To remediate CVE-2026-42573, upgrade the affected package to a fixed version below.
- —upgrade to 5.55.7 or later
Is CVE-2026-42573 being exploited?
Low — EPSS is 0.3%, meaning exploitation activity has not been observed at scale.
Affected packages (1)
- from 0, < 5.55.7
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 4.0 | — | CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:L/VI:N/VA:N/SC:H/SI:H/SA:N |