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 (2)
Core 2
Core References
X_Refsource_Confirm x_refsource_confirm
https://github.com/sveltejs/svelte/security/advisories/GHSA-9rmh-mm8f-r9h6
X_Refsource_Misc x_refsource_misc
https://github.com/sveltejs/svelte/releases/tag/svelte%405.55.7
Scores
CVSS v3
7.5
EPSS
0.0042
EPSS Percentile
33.5%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
no
Technical Impact
partial
Details
CWE
CWE-1333
Status
published
Products (3)
npm/svelte
5.51.5 - 5.55.7npm
svelte/svelte
5.51.5 - 5.55.7
sveltejs/svelte
>= 5.51.5, < 5.55.7
Published
Jun 09, 2026
Tracked Since
Jun 09, 2026