CVE-2026-24470 Skipper Ingress Controller Allows Unauthorized Access to Internal Services via ExternalName
Attackers with Ingress creation permissions can access internal services via ExternalName, bypassing network restrictions.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-24470?
CVE-2026-24470 is a high-severity server-side request forgery vulnerability in zalando skipper, published on 26 Jan 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Skipper is an HTTP router and reverse proxy for service composition. Prior to version 0.24.0, 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. Version 0.24.0 disables Kubernetes ExternalName by default. As a workaround, developers can allow list targets of an ExternalName and allow list via regular expressions.
Which versions are affected by CVE-2026-24470?
3 open source packages ship an affected version, including github.com/zalando/skipper. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
github.com/zalando/skipper Go | All versions | 0.24.0 |
github.com/zalando/skipper Go | All versions | 0.24.0 |
github.com/zalando/skipper Go | All versions | 0.24.0 |
Products include Zalando Skipper.
How do I fix CVE-2026-24470?
Upgrade github.com/zalando/skipper to 0.24.0 or later.
Upgrade, and send outbound requests through an allow-list that blocks internal addresses. More about Server-side request forgery.
Is CVE-2026-24470 being exploited?
There is no known exploitation of CVE-2026-24470 in the wild and no public exploit code.
Other vulnerabilities in zalando skipper
Sources
Also known as GHSA-mxxc-p822-2hx9, GO-2026-4378.