CVE-2026-54247: medium-severity vulnerability in zalando skipper
Skipper: Unbounded Request Body Read in Admission Webhook Causes Memory Exhaustion DoS
Published · Updated
E-mail alert when it lands in KEV, gets a public PoC or its score goes up.
13Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 4.3epss 0.3%
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.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
Affected products
zalando · skipperRelated CVEs — zalando skipper
In the same product, most dangerous first.
CVE-2026-23742HIGHSkipper arbitrary code execution through lua filtersEPSS 0.5%CVE-2026-50197HIGHSkipper: opaAuthorizeRequestWithBody filter bypasses OPA policy on Transfer-Encoding: chunked / HTTP/2 requestsEPSS 0.5%CVE-2026-65838HIGHSkipper: an oversized declared-`Content-Length` body still hands OPA an empty `parsed_body`, so deny-on-presence Rego policies fail OPEN while the full payload reaches upstreamEPSS 0.5%CVE-2026-86043HIGHSkipper: OPA body-authz bypass: truncated_body mitigation fails open on chunked/HTTP-2 (incomplete fix CVE-2026-50197)EPSS 0.5%CVE-2026-65604HIGHSkipper Incomplete Fix for CVE-2026-50197 Policy BypassEPSS 0.4%CVE-2026-54246MEDIUMSkipper routesrv-no-auth: All routesrv API Endpoints Lack AuthenticationEPSS 0.3%