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Medium, CVSS 5.9amended

SvelteKit: adapter-node crashes with an unhandled URIError when reroute rewrites malformed pathnames

CVE-2026-128117GHSA-mw6w-2fmv-pvw3

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (@sveltejs/kit 3.1.1, 2.70.4), redeploy, then verify what is actually installed.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

  • npm @sveltejs/kit

    Affected
    >= 3.0.0, < 3.1.1< 2.70.4
    Fixed in
    3.1.1, 2.70.4

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS
5.9 · CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS
  • CVE-2026-128117: 0.48% estimated exploitation activity in the next 30 days; percentile 41.80 (FIRST EPSS, 2026-11-14). This is a model estimate, not proof of exploitation or customer exposure.
Source description

As published by the source; long descriptions are shortened.

When `reroute` turned an invalid percent-encoded path into a valid path, it could potentially trigger a comparison that would crash the server.

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 2 · amended ·

    Amended from osv record GHSA-mw6w-2fmv-pvw3

  2. Revision 1 · created ·

    Published from ghsa record GHSA-mw6w-2fmv-pvw3

Agent brief

Preview the exact text before you copy it. Commands are read-only suggestions; review them before running anything.

# Patch Next advisory brief: CVE-2026-128117

Advisory: SvelteKit: adapter-node crashes with an unhandled URIError when `reroute` rewrites malformed pathnames
IDs: CVE-2026-128117, GHSA-mw6w-2fmv-pvw3
Record: https://patchnext.com/advisories/cve-2026-128117 (revision 2, source checked 14 Nov 2026, 07:30 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 5.9)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: @sveltejs/kit 3.1.1, 2.70.4. A vendor fix does not mean a deployment is fixed.

## Affected components
- npm @sveltejs/kit: affected >= 3.0.0, < 3.1.1; < 2.70.4; fixed in 3.1.1, 2.70.4

## Suggested inspection (read-only)
- `npm ls @sveltejs/kit --all`: lists every installed copy and version, including transitive ones. Run in the project root after `npm ci`.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on @sveltejs/kit.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-mw6w-2fmv-pvw3 (GitHub-reviewed advisory GHSA-mw6w-2fmv-pvw3 lists affected ranges: npm @sveltejs/kit >=3.0.0 =0 <2.70.4)
- Verified: https://osv.dev/vulnerability/GHSA-mw6w-2fmv-pvw3 (OSV record GHSA-mw6w-2fmv-pvw3 lists affected ranges: npm @sveltejs/kit >=3.0.0 =0 <2.70.4 (fixed))

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