{"cve":"CVE-2026-54246","nvd":{"published":"2026-09-14T20:16:45.697","modified":"2026-09-16T13:42:48.877","status":"Deferred","description":"Skipper is an HTTP router and reverse proxy for service composition. Prior to 0.27.13, the routesrv component serves cluster-wide control-plane data without application-layer authentication through /routes, /routes/{zone}, /swarm/redis/shards, and /swarm/valkey/shards. The handlers registered in routesrv/routesrv.go, eskipBytes.ServeHTTP in routesrv/eskipbytes.go, RedisHandler.ServeHTTP in routesrv/redishandler.go, and ValkeyHandler.ServeHTTP in routesrv/valkeyhandler.go only restrict HTTP methods and do not authenticate callers. A compromised or otherwise attacker-controlled pod that can reach routesrv on the Kubernetes cluster network can bypass its namespace-scoped RBAC and read Ingress and RouteGroup backend URLs, filter-chain and OAuth or OIDC path details, and Redis or Valkey shard addresses across namespaces. NetworkPolicy can restrict reachability but does not remove the missing-authentication condition, and the established impact is confidentiality exposure rather than direct integrity or availability loss. This issue is fixed in version 0.27.13.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N","score":5.7},"cwes":["CWE-306"],"references":["https://github.com/zalando/skipper/commit/fb3d5f98ee749d9a1dfc5df2d51ac9b82fab92aa","https://github.com/zalando/skipper/pull/4056","https://github.com/zalando/skipper/releases/tag/v0.27.13","https://github.com/zalando/skipper/security/advisories/GHSA-5587-2x54-jj6h"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:53:43.293028046+00:00"},"epss":{"cve":"CVE-2026-54246","score":0.00338,"percentile":0.27287,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-5587-2x54-jj6h","url":"https://osv.dev/vulnerability/GHSA-5587-2x54-jj6h","summary":"Skipper's routesrv-no-auth component: All routesrv API Endpoints Lack Authentication","modified":"2026-07-22T21:11:26.185586295Z","packages":[{"ecosystem":"Go","name":"github.com/zalando/skipper","purl":"pkg:golang/github.com/zalando/skipper","ranges":["<0.27.13"],"fixed":["0.27.13"]}]},{"id":"GO-2026-6018","url":"https://osv.dev/vulnerability/GO-2026-6018","summary":"Skipper's routesrv-no-auth component: All routesrv API Endpoints Lack Authentication in github.com/zalando/skipper","modified":"2026-07-22T21:00:24.248278725Z","packages":[{"ecosystem":"Go","name":"github.com/zalando/skipper","purl":"pkg:golang/github.com/zalando/skipper","ranges":["<0.27.13"],"fixed":["0.27.13"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}