DOM Clobbering Vulnerability in Svelte Framework
CVE-2026-42573

5.3MEDIUM

Key Information:

Vendor

Sveltejs

Status
Svelte
Vendor
CVE Published:
9 June 2026

What is CVE-2026-42573?

Prior to version 5.55.7, the Svelte framework was susceptible to a DOM clobbering issue that could compromise its internal state on specific elements. This vulnerability potentially allowed malicious users to execute cross-site scripting (XSS) attacks, thus compromising web applications utilizing the framework. The issue has been addressed in version 5.55.7.

Affected Version(s)

svelte < 5.55.7

References

https://github.com/sveltejs/svelte/security/advisories/GH...
x_refsource_CONFIRM
https://github.com/sveltejs/svelte/releases/tag/svelte%40...
x_refsource_MISC

CVSS V4

Score:
5.3
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
High
Attack Required:
Physical
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.