Vulnerability 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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Svelte | Svelte | >= 5.51.5, < 5.55.7 |
Related Weaknesses (CWE)
References
- https://github.com/sveltejs/svelte/releases/tag/svelte%405.55.7ProductRelease Notes
- https://github.com/sveltejs/svelte/security/advisories/GHSA-9rmh-mm8f-r9h6Vendor Advisory
FAQ
What is CVE-2026-42567?
CVE-2026-42567 is a vulnerability with a CVSS score of 7.5 (HIGH). 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}></...
How severe is CVE-2026-42567?
CVE-2026-42567 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-42567?
Check the references section above for vendor advisories and patch information. Affected products include: Svelte Svelte.