CVE-2026-42567— Svelte: ReDoS in `<svelte:element>` Tag Validation
Possible ATT&CK Techniques 1AI
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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: NVD (National Vulnerability Database)
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: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
CWE-1333
Source: NVD (National Vulnerability Database)
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
II. Public POCs 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
- CVE-2026-42599
Cross-site scripting via spread attributes in Svelte SSR - CVE-2026-42573
Svelte: XSS via DOM Clobbering of Internal Framework State - CVE-2026-27902
Svelte Vulnerable to XSS via HTML Comment Injection in SSR E - CVE-2026-27901
Svelte vulnerable to XSS during SSR with contenteditable `bi - CVE-2026-27125
Svelte SSR attribute spreading includes inherited properties
Same vendor: sveltejs
- CVE-2026-42599
Cross-site scripting via spread attributes in Svelte SSR - CVE-2026-42573
Svelte: XSS via DOM Clobbering of Internal Framework State - CVE-2026-42570
Svelte devalue: DoS via sparse array deserialization - CVE-2026-40074
SvelteKit's invalidated redirect in handle hook causes Denia - CVE-2026-40073
SvelteKit has a BODY_SIZE_LIMIT bypass in @sveltejs/adapter-
Same weakness: CWE-1333
- CVE-2026-45617
LiquidJS: ReDoS via Quadratic Backtracking in `strip_html` F - CVE-2026-47138
Parse Server: Pre-authentication denial of service via clien - CVE-2026-41848
Spring Framework Denial of Service via AntPathMatcher - CVE-2026-11478
kokke tiny-regex-c Pattern re.c matchstar redos - CVE-2026-45409
Internationalized Domain Names in Applications (IDNA): Speci
V. Comments for CVE-2026-42567
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