{"id":"GHSA-w7c2-w76w-5hmj","revision":"6c83c675bcbc4629beb33f1bd9939f8e","records":[{"revision":"6c83c675bcbc4629beb33f1bd9939f8e","observedAt":"2026-10-24T13:19:41.952+00:00","statement":{"source":"osv","id":"GHSA-w7c2-w76w-5hmj","aliases":["BIT-cilium-2026-56742","BIT-cilium-operator-2026-56742","BIT-hubble-relay-2026-56742","CVE-2026-56742","GO-2026-6596"],"title":"Cilium: Namespaced HTTPRoutes can redirect traffic to other namespaces","description":"### Impact\n\nIn Cilium clusters using [Gateway API](https://docs.cilium.io/en/stable/network/servicemesh/gateway-api/gateway-api/), users with permissions to create or update namespaced HTTPRoutes can mirror HTTP traffic to any Service in any namespace, bypassing the ReferenceGrant authorization mechanism.\n\nGateway API functionality is disabled by default.\n\n### Patches\n\nThis issue affects:\n\n* Cilium v1.19 from v1.19.0 to v1.19.4 inclusive\n* Cilium v1.18 from v1.18.0 to v1.18.10 inclusive\n* All versions of Cilium before v1.17.17\n\nThis issue is patched in:\n\n* Cilium v1.19.5\n* Cilium v1.18.11\n* Cilium v1.17.17\n\n### Workarounds\n\nThere is no workaround to this issue. Users of this feature who are unable to upgrade can mitigate the risk by ensuring that RBAC permissions to create `HTTPRoute` objects are only granted to cluster admins.\n\n### Acknowledgements\n\nThe Cilium community has worked together with members of Isovalent to prepare these mitigations. Special thanks to @galanko for reporting the issue and @mhofstetter for their work on triaging and remediating this issue.\n\n### For more information\n\nIf you have any questions or comments about this advisory, please reach out on [Slack](https://docs.cilium.io/en/latest/community/community/).\n\nIf you think you have found a vulnerability affecting Cilium, we strongly encourage you to report it to our security mailing list at [security@cilium.io](mailto:security@cilium.io). This is a private mailing list for the Cilium security team, and your report will be treated as top priority.","state":0,"publishedAt":"2026-09-24T19:38:39+00:00","modifiedAt":"2026-10-01T20:56:11.8160673+00:00","affected":[{"ecosystem":"Go","name":"github.com/cilium/cilium","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"},{"kind":"fixed","version":"1.17.17"}]}],"versions":[],"rawVersionEvidence":null},{"ecosystem":"Go","name":"github.com/cilium/ciliumCilium","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"1.18.0"},{"kind":"fixed","version":"1.18.11"}]}],"versions":[],"rawVersionEvidence":null},{"ecosystem":"Go","name":"github.com/cilium/cilium","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"1.19.0"},{"kind":"fixed","version":"1.19.5"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V3","vector":"CVSS:3.1/AV:A/AC:L/PR:H/UI:N/S:C/C:L/I:L/A:L","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"MODERATE"}],"references":["https://github.com/cilium/cilium/security/advisories/GHSA-w7c2-w76w-5hmj","https://nvd.nist.gov/vuln/detail/CVE-2026-56742","https://github.com/cilium/cilium/commit/7422068aff67ac77c7dcc57aa5b9240c91333deb","https://github.com/cilium/cilium/commit/e0b1cef513ff910323f3743e9f3e3d86721e4857","https://github.com/cilium/cilium/commit/f23929cff682d6ed0dc158070812cb302fc0032b","https://github.com/cilium/cilium/commit/fd47963ea394d5e8fa4a88c40a79063430c512ca","https://github.com/cilium/cilium","https://github.com/cilium/cilium/releases/tag/v1.17.17","https://github.com/cilium/cilium/releases/tag/v1.18.11","https://github.com/cilium/cilium/releases/tag/v1.19.5"],"sourceUrl":"https://github.com/advisories/GHSA-w7c2-w76w-5hmj","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-w7c2-w76w-5hmj","identifiers":["GHSA-w7c2-w76w-5hmj","BIT-cilium-2026-56742","BIT-cilium-operator-2026-56742","BIT-hubble-relay-2026-56742","CVE-2026-56742","GO-2026-6596"]},"retained":false,"historicalAffected":[]}],"coverage":[]}