CVE-2026-42567

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.

References

• https://github.com/sveltejs/svelte/releases/tag/svelte%405.55.7
• https://github.com/sveltejs/svelte/security/advisories/GHSA-9rmh-mm8f-r9h6