Ingress Controller Vulnerability in Skipper by Zalando
CVE-2026-24470

8.1HIGH

Key Information:

Vendor

Zalando

Status
Skipper
Vendor
CVE Published:
26 January 2026

What is CVE-2026-24470?

Skipper, an HTTP router and reverse proxy, previously allowed users with permissions to create Ingress and ExternalName services to construct routes that could grant access to internal services. This flaw primarily affects versions prior to 0.24.0. In version 0.24.0, Zalando has mitigated this issue by disabling Kubernetes ExternalName by default. As a responsive measure, developers are recommended to implement allow lists for ExternalName targets and utilize regular expressions for additional security.

Affected Version(s)

skipper < 0.24.0

References

https://github.com/zalando/skipper/security/advisories/GH...
x_refsource_CONFIRM
https://github.com/zalando/skipper/commit/a4c87ce029a58eb...
x_refsource_MISC
https://kubernetes.io/docs/concepts/services-networking/s...
x_refsource_MISC

CVSS V3.1

Score:
8.1
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.