CVE-2026-42573

Summary

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.

Affected Software

Weaknesses

• CWE-79: CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: none
  • Automatable: no
  • Technical Impact: partial

svelte: Svelte: Cross-Site Scripting via DOM Clobbering

Additional References

• https://access.redhat.com/security/cve/CVE-2026-42573
• https://bugzilla.redhat.com/show_bug.cgi?id=2487093
• https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-42573.json

References

• https://github.com/sveltejs/svelte/security/advisories/GHSA-rcqx-6q8c-2c42
• https://github.com/sveltejs/svelte/releases/tag/svelte%405.55.7

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