CVE-2026-42567

EUVD-2026-35702
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.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
7.5 HIGH
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Base Score
CVSS 3.x
EPSS Score
Percentile: 34%
Affected Products (NVD)
VendorProductVersion
sveltesvelte
5.51.5 ≤
𝑥
< 5.55.7
𝑥
= Vulnerable software versions
Common Weakness Enumeration
References
https://github.com/sveltejs/svelte/releases/tag/svelte%405.55.7
https://github.com/sveltejs/svelte/security/advisories/GHSA-9rmh-mm8f-r9h6