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  4. CVE 2026 128117 sveltekit unhandled urierror when reroute
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Back to active CVEs
Medium · CVSS 5.9CVE-2026-128117GHSA-MW6W-2FMV-PVW3

SvelteKit: Unhandled URIError when `reroute` rewrites a malformed pathname crashes adapter-nodeCVE-2026-128117

Answer in brief

CVE-2026-128117 records a Medium severity (CVSS 5.9) vulnerability in SvelteKit: Unhandled URIError when `reroute` rewrites a malformed pathname crashes adapter-node. The current sources do not mark it as known exploited. The current feed maps sveltejs/kit (generic), @sveltejs/kit (npm), @sveltejs/kit (npm), @sveltejs/kit (npm) and additional mapped packages. Check affected ranges and fixed versions before updating.

Analysis pending evidence review

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

Published Nov 13, 2026Updated Nov 13, 2026Source checked Nov 13, 2026First seen by HOL Nov 13, 2026Material review Nov 13, 2026
Upstream Advisory

Key facts

Risk
Medium · CVSS 5.9
Exploitation
Not marked as known exploited
Affected software
5 mapped packages or products
Fix availability
Available

Why this deserves its current priority

CVSS is 5.9. 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 sveltejs/kit (generic), @sveltejs/kit (npm), @sveltejs/kit (npm), @sveltejs/kit (npm) and additional mapped packages. Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
sveltejs/kitgeneric<2.70.4 || >=3.0.0 <3.1.12.70.4, 3.1.1
@sveltejs/kitnpm>=3.0.0,<3.1.13.1.1
@sveltejs/kitnpm<2.70.42.70.4
@sveltejs/kitnpm>=3.0.0,<3.1.13.1.1
@sveltejs/kitnpm<2.70.42.70.4

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for sveltejs/kit, @sveltejs/kit, @sveltejs/kit.
  2. 2Review the reported fix. Update sveltejs/kit to 2.70.4; @sveltejs/kit to 3.1.1; @sveltejs/kit to 2.70.4; @sveltejs/kit to 3.1.1; @sveltejs/kit to 2.70.4 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Nov 13, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Nov 13, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Nov 13, 2026

Sources and claim methodology

  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
Upstream source description

SvelteKit is a framework for rapidly developing robust, performant web applications using Svelte. Prior to versions 2.70.4 and 3.1.1, the reroute hook could rewrite an invalid percent-encoded pathname into a valid route and reach a comparison that decoded the original malformed pathname outside the guarded decoding operation. The resulting unhandled URIError could crash an adapter-node server and deny service to other requests. This issue is fixed in 2.70.4 and 3.1.1.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • SvelteKit: Protocol-relative module import during server-side route resolution allows cross-origin script executionSame sveltejs/kit package
  • SvelteKit: Build-time server-only module import guard could fail, resulting in server secrets being statically replaced in client bundleSame sveltejs/kit package
  • SvelteKit: Private `query.batch` functions could collide, producing unexpected parameter / function combinationsSame sveltejs/kit package
  • SvelteKit: DoS while parsing form data from a remote functions `form`Same sveltejs/kit package
  • SvelteKit: Prerendered paths are interpreted as regular expressions in Vercel route config generated by @sveltejs/adapter-vercel and @sveltejs/adapter-staticSame sveltejs/kit package
  • SvelteKit: Prerendered redirect paths can inject arbitrary rules into the `_redirects` file generated by `@sveltejs/adapter-cloudflare`Same sveltejs/kit package

Record context

Vulnerability class
Vulnerability
EPSS
Not reported
CWE IDs
CWE-248
Source
CVE List V5
Source checked
Nov 13, 2026
References
7 linked sources
Open source record