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CVE-2026-42567— Svelte: ReDoS in `<svelte:element>` Tag Validation

Quick assessment

Affected
sveltejs svelte
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Svelte是Svelte开源的一种构建 Web 应用程序的新方法。 Svelte 5.51.5版本至5.55.7之前版本存在安全漏洞，该漏洞源于内部正则表达式测试耗时指数级增长，可能导致拒绝服务。

AI Predicted 5.3 Difficulty: Moderate EPSS 0.44% · P36

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking

Affected Version Matrix 1

VendorProduct Version RangeStatus
sveltejs svelte >= 5.51.5, < 5.55.7 affected
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I. Basic Information for CVE-2026-42567

Vulnerability Information
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Vulnerability Title
Svelte: ReDoS in `<svelte:element>` Tag Validation
Source: CVE Program / CVE List V5
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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-1333
Source: CVE Program / CVE List V5
Vulnerability Title
Svelte 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Svelte是Svelte开源的一种构建 Web 应用程序的新方法。 Svelte 5.51.5版本至5.55.7之前版本存在安全漏洞，该漏洞源于内部正则表达式测试耗时指数级增长，可能导致拒绝服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
sveltejs svelte >= 5.51.5, < 5.55.7 -

II. Public POCs for CVE-2026-42567

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III. Intelligence Information for CVE-2026-42567

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Vendor Advisories for CVE-2026-42567 (1)

Vendor Pages for CVE-2026-42567 (1)

Same Patch Batch · sveltejs · 2026-06-09 · 4 CVEs total

CVE-2026-42570 7.5 HIGH Svelte devalue: DoS via sparse array deserialization
CVE-2026-42573 Svelte: XSS via DOM Clobbering of Internal Framework State
CVE-2026-42599 Cross-site scripting via spread attributes in Svelte SSR

IV. Related Vulnerabilities

Same product: svelte
Same vendor: sveltejs
Same weakness: CWE-1333

V. Comments for CVE-2026-42567

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