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: 2026-06-09
Score: 5.9 Medium
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

No vendor fix or workaround currently provided.

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Tracking

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Advisories
Source ID Title
Github GHSA Github GHSA GHSA-9rmh-mm8f-r9h6 Svelte: ReDoS in `<svelte:element>` Tag Validation
History

Sat, 13 Jun 2026 00:15:00 +0000

Type Values Removed Values Added
References
Metrics threat_severity

None

threat_severity

Moderate


Thu, 11 Jun 2026 19:00:00 +0000

Type Values Removed Values Added
CPEs cpe:2.3:a:svelte:svelte:*:*:*:*:*:node.js:*:*
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}


Tue, 09 Jun 2026 20:15:00 +0000

Type Values Removed Values Added
First Time appeared Svelte
Svelte svelte
Vendors & Products Svelte
Svelte svelte

Tue, 09 Jun 2026 18:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Tue, 09 Jun 2026 17:15:00 +0000

Type Values Removed Values Added
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.
Title Svelte: ReDoS in `<svelte:element>` Tag Validation
Weaknesses CWE-1333
References
Metrics cvssV4_0

{'score': 5.9, 'vector': 'CVSS:4.0/AV:N/AC:H/AT:P/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N'}


cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-06-09T18:09:26.356Z

Reserved: 2026-04-28T17:26:12.084Z

Link: CVE-2026-42567

cve-icon Vulnrichment

Updated: 2026-06-09T18:09:12.952Z

cve-icon NVD

Status : Analyzed

Published: 2026-06-09T17:17:07.100

Modified: 2026-06-11T18:54:39.847

Link: CVE-2026-42567

cve-icon Redhat

Severity : Moderate

Publid Date: 2026-06-09T16:22:22Z

Links: CVE-2026-42567 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-06-09T20:00:17Z

Weaknesses