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  4. CVE 2026 27122 svelte ssr does not validate dynamic element tag
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Back to active CVEs
Medium severityCVE-2026-27122GHSA-M56Q-VW4C-C2CP

Svelte SSR does not validate dynamic element tag names in `<svelte:element>`CVE-2026-27122

Answer in brief

CVE-2026-27122 records a Medium severity vulnerability in Svelte SSR does not validate dynamic element tag names in `<svelte:element>`. The current sources do not mark it as known exploited. The current feed maps svelte (npm). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Feb 18, 2026Updated Feb 18, 2026Source checked Oct 10, 2026First seen by HOL Aug 25, 2026Material review Feb 18, 2026
Upstream Advisory

Key facts

Risk
Medium
Exploitation
Not marked as known exploited
Affected software
1 mapped package or product
Fix availability
Not reported

Why this deserves its current priority

A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps svelte (npm). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
sveltenpm<=5.51.4Not reported

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for svelte.
  2. 2Review the reported fix. Monitor this advisory for an available fix and review any installs of the affected package.

Evidence timeline and material changes

  1. Published upstream

    Feb 18, 2026

    Evidence: source:ghsa:source_dates:source-dates:record

  2. Source modified

    Feb 18, 2026

    Evidence: source:ghsa:source_dates:source-dates:record

  3. First seen by HOL

    Aug 25, 2026

Sources and claim methodology

  • GitHub security advisorygithub.com
Upstream source description

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.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • Tina: Code injection via unescaped Git branch name in generated client sourceSame npm ecosystem
  • @tinacms/web-components: `tina-markdown` writes rich-text link URLs into `href` without scheme validation, allowing stored XSSSame npm ecosystem
  • TinaCMS admin preview iframe loads an attacker-controlled origin from the URL fragmentSame npm ecosystem

Record context

Vulnerability class
Vulnerability
EPSS
Not reported
CWE IDs
Not reported
Source
GitHub Security Advisories
Source checked
Oct 10, 2026
References
1 linked source
Open source record