CVE-2026-42573
Medium
Description
Svelte is a performance oriented web framework. Prior to version 5.55.7, Svelte was vulnerable to DOM clobbering of its internal framework state on elements, potentially leading to XSS attacks. This issue has been patched in version 5.55.7.
SeverityMedium
CVSS6.1
Exploit probability—
Product
Svelte
PublishedJun 9, 2026
First seenJun 9, 2026
Weakness typeCWE-79Cross-site scripting (XSS)
How to fix
Update
- svelte svelte5.55.7 or later
- svelte5.55.7 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| svelte svelte | v < 5.55.7 | 5.55.7 |
| sveltenpm | v < 5.55.7 | 5.55.7 |
Check your version
Choose the product and enter the version you run to see whether it falls in the affected range.
In the Intelligence 360 plan
Attack Surface Management
See the assets tied to your domains, the technologies they run and known vulnerabilities in one list.