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CVE

CVE-2026-24470

Skipper Ingress Controller Allows Unauthorized Access to Internal Services via ExternalName
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CVE

CVE-2026-24470

Skipper Ingress Controller Allows Unauthorized Access to Internal Services via ExternalName

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

Package Versions Affected

Package Version
patch Availability
No items found.

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CVSS Version

Severity
Base Score
CVSS Version
Score Vector
C
H
U
8.1
-
3.1
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
C
H
U
0
-
3.1
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
C
H
U
8.1
-
3.1
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

Related Resources

No items found.

References

https://github.com/zalando/skipper/security/advisories/GHSA-mxxc-p822-2hx9, https://nvd.nist.gov/vuln/detail/CVE-2026-24470, https://github.com/zalando/skipper/commit/a4c87ce029a58eb8e1c2c1f93049194a39cf6219, https://github.com/zalando/skipper, https://github.com/zalando/skipper/releases/tag/v0.24.0, https://kubernetes.io/docs/concepts/services-networking/service/#externalname

Severity

8.1

CVSS Score
0
10

Basic Information

Ecosystem
Base CVSS
8.1
EPSS Probability
0.00031%
EPSS Percentile
0.08642%
Introduced Version
0,v0.13.149,v0.0.0-20211130132302-ffc778616562,v0.11.29,v0.0.0-20200128085838-8075c3563e77
Fix Available
0.24.0,v0.24.0,v0.0.0-20260126202219-a4c87ce029a5

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