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Medium, CVSS 6.4amended

9router: Kiro region injection allows authenticated SSRF with Authorization header forwarding

CVE-2026-56678GHSA-6mwv-4mrm-5p3m

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (9router 0.5.6), 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 9router

    Affected
    <= 0.5.2
    Fixed in
    0.5.6

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS
6.4 · CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
EPSS
  • CVE-2026-56678: 0.21% estimated exploitation activity in the next 30 days; percentile 11.29 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.
Source description

As published by the source; long descriptions are shortened.

Summary The Kiro API-key validation endpoint builds an upstream URL using a user-controlled region value. By supplying a crafted region such as kiro-canary.local:8443#, an authenticated attacker can cause 9router to send the Kiro validation request to an attacker-controlled host under the constructed codewhisperer.<region hostname. The request forwards the submitted Kiro API key as an Authorization: Bearer header. Details - Affected version / commit: 9router v0.5.2 @ 5da508a. - Endpoint: POST /api/oauth/kiro/api-key. - Correct runtime payload: region: "kiro-canary.local:8443#". - Do not use the old @host

payload (region: "@kiro-canary.local:8443#"); it is blocked by Node/undici fetch() because it creates URL credentials ("Request cannot be constructed from a URL that includes credentials"). - Constructed upstream host becomes: codewhisperer.kiro-canary.local:8443 (the

turns the trailing .amazonaws.com into a URL fragment). - HTTPS canary captured: Authorization: Bearer…

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 3 · amended ·

    Amended from ghsa record GHSA-6mwv-4mrm-5p3m

  2. Revision 2 · amended ·

    Amended from osv record GHSA-6mwv-4mrm-5p3m

  3. Revision 1 · created ·

    Published from ghsa record GHSA-6mwv-4mrm-5p3m

Agent brief

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# Patch Next advisory brief: CVE-2026-56678

Advisory: 9router: Kiro region injection allows authenticated SSRF with Authorization header forwarding
IDs: CVE-2026-56678, GHSA-6mwv-4mrm-5p3m
Record: https://patchnext.com/advisories/cve-2026-56678 (revision 3, source checked 26 Oct 2026, 13:02 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 6.4)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: 9router 0.5.6. A vendor fix does not mean a deployment is fixed.

## Affected components
- npm 9router: affected <= 0.5.2; fixed in 0.5.6

## Suggested inspection (read-only)
- `npm ls 9router --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 9router.
- 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-6mwv-4mrm-5p3m (GitHub-reviewed advisory GHSA-6mwv-4mrm-5p3m lists affected ranges: npm 9router >=0 <=0.5.2)
- Verified: https://osv.dev/vulnerability/GHSA-6mwv-4mrm-5p3m (OSV record GHSA-6mwv-4mrm-5p3m lists affected ranges: npm 9router >=0 <0.5.6 (fixed))

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