Bug 2441520 (CVE-2026-27122) - CVE-2026-27122 svelte: Svelte SSR does not validate dynamic element tag names in `<svelte:element>`
Summary: CVE-2026-27122 svelte: Svelte SSR does not validate dynamic element tag names...
Keywords:
Status: NEW
Alias: CVE-2026-27122
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On: 2441547 2441551
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-02-20 23:01 UTC by OSIDB Bzimport
Modified: 2026-02-20 23:45 UTC (History)
0 users

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Description OSIDB Bzimport 2026-02-20 23:01:57 UTC 
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.
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