CVE-2026-54247 Details
Description
Skipper is an HTTP router and reverse proxy for service composition. Prior to 0.26.22, Handler in dataclients/kubernetes/admission/admission.go passes the body of requests to the Kubernetes admission endpoint at :9443/admission directly to io.ReadAll(r.Body) without a size limit. An attacker with in-cluster network access and a valid Kubernetes client certificate can send a very large body that causes unbounded memory allocation and an out-of-memory termination of the Skipper process. The disruption is limited to Ingress and RouteGroup admission rather than pod creation or unrelated admission controllers, and Kubernetes normally restarts the process. This issue is fixed in version 0.26.22.
A denial-of-service vulnerability has been identified in Zalando Skipper versions prior to 0.26.22. The issue arises in the Kubernetes admission webhook handler, which reads the entire request body without any size limit. This flaw allows an attacker with in-cluster network access and a valid Kubernetes client certificate to send a multi-GB payload, leading to unbounded memory allocation and causing the Skipper process to be terminated due to out-of-memory conditions. The disruption affects Ingress and RouteGroup admission processes, although Kubernetes automatically restarts the Skipper process after termination.
Users can upgrade to Skipper version 0.26.22 or later, where this vulnerability has been fixed.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Sep 14, 2026CISA-ADP
Assessed Sep 16, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/zalando/skipper/commit/c3d156c6caaefecc9a46774c0f9c3c70b97160b4 | [email protected] | Source CodeVendor |
| https://github.com/zalando/skipper/pull/4053 | [email protected] | Issue TrackingSource CodeVendor |
| https://github.com/zalando/skipper/releases/tag/v0.26.22 | [email protected] | Release NotesVendor |
| https://github.com/zalando/skipper/security/advisories/GHSA-cwxq-rc9x-2jvv | [email protected] | AdvisoryRemedyVendor |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-770 | Allocation of Resources Without Limits or Throttling | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| Zalando Skipper | < 0.26.22 (semver) |
CPE
Remediation
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Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Sep 16, 2026 | CVE Modified | CISA-ADP |
| Sep 14, 2026 | New CVE Received | [email protected] |