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Security Advisories

CVE-2026-27122

NVD

https://nvd.nist.gov/vuln/detail/CVE-2026-27122

Severity

Unknown
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Summary

Svelte SSR does not validate dynamic element tag names in <svelte:element>

Description

svelte performance oriented web framework. Prior to 5.51.5, when using <svelte:element this={tag}> in server-side rendering, the provided tag name is not validated or sanitized before being emitted into the HTML output. If the tag string contains unexpected characters, it can result in HTML injection in the SSR output. Client-side rendering is not affected. This vulnerability is fixed in 5.51.5.

  • https://nvd.nist.gov/vuln/detail/CVE-2026-27122
  • https://github.com/advisories/GHSA-m56q-vw4c-c2cp
  • https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/27xxx/CVE-2026-27122.json
  • https://github.com/sveltejs/svelte/security/advisories/GHSA-m56q-vw4c-c2cp

Affected packages

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