CVE-2026-42567

HighCVSS 7.5/10Last modified Jul 23, 2026

Description

Svelte is a performance oriented web framework. From version 5.51.5 to before version 5.55.7, an internal regex in the Svelte runtime can take exponential time to test in <svelte:element this={tag}></svelte:element>. This issue has been patched in version 5.55.7.

Metrics

CVSS 3.1 7.5/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Weakness enumeration

CWE-1333

Affected software

Vendor	Product	Versions
sveltejs	svelte	>= 5.51.5, < 5.55.7

References

https://github.com/sveltejs/svelte/releases/tag/svelte%405.55.7Product, Release Notes
https://github.com/sveltejs/svelte/security/advisories/GHSA-9rmh-mm8f-r9h6Vendor Advisory

Timeline

Published: Jun 9, 2026
Last modified: Jul 23, 2026
NVD status: Analyzed

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