Vulnerability · Published Jan 26, 2026 · Assigned by GitHub_M
CVE-2026-24470Skipper Ingress Controller Allows Unauthorized Access to Internal Services via ExternalName
High 8.1
In plain English
A high-severity server-side request forgery in skipper from zalando. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 24% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Go | github.com/zalando/skipper | 0.24.0 | GHSA-mxxc-p822-2hx9 |
| Go | github.com/zalando/skipper | 0.24.0 | GO-2026-4378 |
Affected products (as reported)
Weakness: CWE-441, CWE-918 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N