{"id":"CVE-2026-54247","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-54247","generatedAt":"2026-10-28T03:32:18.901Z","title":"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.","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.","published":"2026-09-14T20:16:46.000Z","lastModified":"2026-09-16T17:17:21.000Z","status":"Deferred","sourceIdentifier":"security-advisories@github.com","cvss":{"version":"3.1","score":4.3,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L"},"cwe":["CWE-770"],"affected":[],"epss":{"score":0.00298,"percentile":0.22358,"date":"2026-10-27","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"low","text":"Lower severity and a low EPSS score (0.30%). Track it; it rarely justifies an emergency change on its own."},"changes":[],"references":[{"url":"https://github.com/zalando/skipper/commit/c3d156c6caaefecc9a46774c0f9c3c70b97160b4","source":"security-advisories@github.com"},{"url":"https://github.com/zalando/skipper/pull/4053","source":"security-advisories@github.com"},{"url":"https://github.com/zalando/skipper/releases/tag/v0.26.22","source":"security-advisories@github.com"},{"url":"https://github.com/zalando/skipper/security/advisories/GHSA-cwxq-rc9x-2jvv","source":"security-advisories@github.com"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-54247","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}