Authenticated service interruption via unbounded admission body
Published Sep 14, 2026 · Updated Sep 14, 2026
Denial of service in Zalando Skipper before 0.26.22 allows remote authenticated users to crash the process via its admission webhook. The handler in dataclients/kubernetes/admission/admission.go passes the request body directly to io.ReadAll without a size limit, allowing attacker-controlled input to exhaust process memory. Exploitation requires in-cluster access and a valid Kubernetes client certificate; the resulting OOM termination interrupts only Ingress and RouteGroup admission until Kubernetes restarts the process.
Summary
What happened
Denial of service in Zalando Skipper before 0.26.22 allows remote authenticated users to crash the process via its admission webhook. The handler in dataclients/kubernetes/admission/admission.go passes the request body directly to io.ReadAll without a size limit, allowing attacker-controlled input to exhaust process memory. Exploitation requires in-cluster access and a valid Kubernetes client certificate; the resulting OOM termination interrupts only Ingress and RouteGroup admission until Kubernetes restarts the process.
The record
- CVE
- CVE-2026-54247
- Published
- Sep 14, 2026
- Updated
- Sep 14, 2026
- Vendor
- Zalando
- Product
- Skipper
- Classifications
- CWE-770, T1499.003
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Sep 14, 2026CVE publishedPublication date reported by the CVE source.
- Sep 14, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=< 0.26.22
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- GHSA admission-webhook oversized-body attack pathproof of concept · unverified
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Technologies
Your stack
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Your stack
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