CVE-2026-42567

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 v3 7.5 HIGH

7.5^/10

CVSS v3 : HIGH

Vector :

Exploitability : 3.9 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://github.com/sveltejs/svelte/releases/tag/svelte%405.55.7	Product Release Notes
https://github.com/sveltejs/svelte/security/advisories/GHSA-9rmh-mm8f-r9h6	Vendor Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:svelte:svelte:*:*:*:*:*:node.js:*:*

History

23 Jul 2026, 08:10

Type	Values Removed	Values Added
Summary		(es) Svelte es un framework web orientado al rendimiento. Desde la versión 5.51.5 hasta antes de la versión 5.55.7, una expresión regular interna en el tiempo de ejecución de Svelte puede tardar un tiempo exponencial en probarse en <svelte:element this={tag}></svelte:element>. Este problema ha sido parcheado en la versión 5.55.7.

11 Jun 2026, 18:54

Type	Values Removed	Values Added
CVSS	v2 : ~~unknown~~ v3 : ~~unknown~~	v2 : unknown v3 : 7.5
CPE		cpe:2.3:a:svelte:svelte::::::node.js::*
First Time		Svelte svelte Svelte
References	~~() https://github.com/sveltejs/svelte/releases/tag/svelte%405.55.7 -~~	() https://github.com/sveltejs/svelte/releases/tag/svelte%405.55.7 - Product, Release Notes
References	~~() https://github.com/sveltejs/svelte/security/advisories/GHSA-9rmh-mm8f-r9h6 -~~	() https://github.com/sveltejs/svelte/security/advisories/GHSA-9rmh-mm8f-r9h6 - Vendor Advisory

09 Jun 2026, 17:17

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-06-09 17:17

Updated : 2026-07-23 08:10

NVD link : CVE-2026-42567

Mitre link : CVE-2026-42567

CVE.ORG link : CVE-2026-42567

JSON object : View

Products Affected

svelte

svelte

CWE

CWE-1333

Inefficient Regular Expression Complexity

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