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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.

PUBLISHED Reserved 2026-04-28 | Published 2026-06-09 | Updated 2026-06-09 | Assigner GitHub_M




MEDIUM: 5.9CVSS:4.0/AV:N/AC:H/AT:P/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

Problem types

CWE-1333: Inefficient Regular Expression Complexity

Product status

>= 5.51.5, < 5.55.7
affected

References

github.com/...svelte/security/advisories/GHSA-9rmh-mm8f-r9h6

github.com/sveltejs/svelte/releases/tag/svelte@5.55.7

cve.org (CVE-2026-42567)

nvd.nist.gov (CVE-2026-42567)

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