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CVE-2026-42567

Svelte: ReDoS in `<svelte:element>` Tag Validation

Published: Jun 9, 2026Updated: Jun 11, 2026 Sources: CVE List NVDCWE-1333
NVD MITRE
7.5CVSSHIGH
EPSS Score
0.4%
Top 66.5%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

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 Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:NI:NA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:NIntegrity
None
A:HAvailability
High
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Weaknesses

CWE-1333

Affected Products

sveltesvelte
Library
OSS Libraries / web-framework
sveltesveltejs
Library
OSS Libraries / web-framework
svelteoss-projectOSS Librariesaka kit, sveltekit
sveltejsoss-projectOSS Libraries

Attack Graph

Products CVE Techniques Tactics

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Exploitability

Official Patch Available

MITRE ATT&CK

1 technique
Impact
View detailed technique mapping

References

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

Timeline

Published
Jun 9, 2026
Last Updated
Jun 11, 2026

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