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High, CVSS 8.1

Skipper Ingress Controller Allows Unauthorized Access to Internal Services via ExternalName

CVE-2026-24470GHSA-mxxc-p822-2hx9

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (github.com/zalando/skipper 0.24.0), 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

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS
8.1 · CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
EPSS
  • CVE-2026-24470: 0.31% estimated exploitation activity in the next 30 days; percentile 24.32 (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.

Impact When running Skipper as an Ingress controller, users with permissions to create an Ingress and a Service of type ExternalName can create routes that enable them to use Skipper's network access to reach internal services. Patches https://github.com/zalando/skipper/releases/tag/v0.24.0 disables Kubernetes ExternalName by default. Workarounds Developers can allow list targets of an ExternalName by using -kubernetes-only-allowed-external-names=true and allow list via regular expressions -kubernetes-allowed-external-name '^[a-z][a-z0-9-.]+[.].allowed.example$' References https://kubernetes.io/docs/concepts/services-networking/service/#externalname

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

    Published from ghsa record GHSA-mxxc-p822-2hx9

Agent brief

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# Patch Next advisory brief: CVE-2026-24470

Advisory: Skipper Ingress Controller Allows Unauthorized Access to Internal Services via ExternalName
IDs: CVE-2026-24470, GHSA-mxxc-p822-2hx9
Record: https://patchnext.com/advisories/cve-2026-24470 (revision 1, source checked 26 Oct 2026, 15:14 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 8.1)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: github.com/zalando/skipper 0.24.0. A vendor fix does not mean a deployment is fixed.

## Affected components
- Go github.com/zalando/skipper: affected < 0.24.0; fixed in 0.24.0

## Suggested inspection (read-only)
- Go github.com/zalando/skipper: check the installed version with your package manager.

## 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 github.com/zalando/skipper.
- 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-mxxc-p822-2hx9 (GitHub-reviewed advisory GHSA-mxxc-p822-2hx9 lists affected ranges: Go github.com/zalando/skipper >=0 <0.24.0)

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