{"id":"CVE-2026-56742","summary":"Cilium: Namespaced HTTPRoutes can redirect traffic to other namespaces","details":"Cilium is a networking, observability, and security solution. Prior to 1.17.17, 1.18.11, and 1.19.5, Cilium clusters using Gateway API allow users with permissions to create or update namespaced HTTPRoutes to mirror HTTP traffic to any Service in any namespace, bypassing the ReferenceGrant authorization mechanism. Gateway API functionality is disabled by default. This issue is fixed in versions 1.17.17, 1.18.11, and 1.19.5.","aliases":["BIT-cilium-2026-56742","BIT-cilium-operator-2026-56742","BIT-hubble-relay-2026-56742","GHSA-w7c2-w76w-5hmj"],"modified":"2026-07-20T08:41:37.922542140Z","published":"2026-07-15T19:14:07.617Z","related":["CGA-qq3j-jcc8-3xj6"],"database_specific":{"cwe_ids":["CWE-862"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/56xxx/CVE-2026-56742.json","cna_assigner":"GitHub_M"},"references":[{"type":"WEB","url":"https://github.com/cilium/cilium/releases/tag/v1.17.17"},{"type":"WEB","url":"https://github.com/cilium/cilium/releases/tag/v1.18.11"},{"type":"WEB","url":"https://github.com/cilium/cilium/releases/tag/v1.19.5"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/56xxx/CVE-2026-56742.json"},{"type":"ADVISORY","url":"https://github.com/cilium/cilium/security/advisories/GHSA-w7c2-w76w-5hmj"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-56742"},{"type":"FIX","url":"https://github.com/cilium/cilium/commit/7422068aff67ac77c7dcc57aa5b9240c91333deb"},{"type":"FIX","url":"https://github.com/cilium/cilium/commit/e0b1cef513ff910323f3743e9f3e3d86721e4857"},{"type":"FIX","url":"https://github.com/cilium/cilium/commit/f23929cff682d6ed0dc158070812cb302fc0032b"},{"type":"FIX","url":"https://github.com/cilium/cilium/commit/fd47963ea394d5e8fa4a88c40a79063430c512ca"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/cilium/cilium","events":[{"introduced":"0"},{"fixed":"0db95967f554c95ee21a1fb7268bb5785e563d9d"},{"introduced":"274205f001bb24b89d19f0fe7c3fb3aca20030c2"},{"fixed":"617b6b49b57901ea2671e5468b11ac7341e4beb8"},{"introduced":"7c6667e1e707d7f39a4af3409c2a9ebea2917d32"},{"fixed":"20eaccfef029cb046d70219717fb6dbbdf27a59f"},{"fixed":"7422068aff67ac77c7dcc57aa5b9240c91333deb"},{"fixed":"e0b1cef513ff910323f3743e9f3e3d86721e4857"},{"fixed":"f23929cff682d6ed0dc158070812cb302fc0032b"},{"fixed":"fd47963ea394d5e8fa4a88c40a79063430c512ca"}],"database_specific":{"source":["CPE_RANGE","REFERENCES"],"cpe":"cpe:2.3:a:cilium:cilium:*:*:*:*:*:*:*:*","extracted_events":[{"introduced":"0"},{"fixed":"1.17.17"},{"introduced":"1.18.0"},{"fixed":"1.18.11"},{"introduced":"1.19.0"},{"fixed":"1.19.5"}]}}],"versions":["v1.20.0-pre.3","1.20.0-pre.3","v1.19.4","1.19.4","v1.18.10","1.18.10","v1.17.16","1.17.16","v1.20.0-pre.2","1.20.0-pre.2","v1.19.3","1.19.3","v1.17.15","1.17.15","v1.18.9","1.18.9","v1.20.0-pre.1","1.20.0-pre.1","v1.17.14","1.17.14","v1.19.2","1.19.2","v1.18.8","1.18.8","v1.20.0-pre.0","1.20.0-pre.0","v1.19.1","1.19.1","v1.17.13","1.17.13","v1.18.7","1.18.7","v1.19.0","1.19.0","v1.18.6","1.18.6","v1.17.12","1.17.12","v1.19.0-pre.4","1.19.0-pre.4","v1.18.5","1.18.5","v1.17.11","1.17.11","v1.19.0-pre.3","1.19.0-pre.3","v1.18.4","1.18.4","v1.17.10","1.17.10","v1.19.0-pre.2","1.19.0-pre.2","v1.18.3","1.18.3","v1.17.9","1.17.9","v1.19.0-pre.1","1.19.0-pre.1","v1.17.8","1.17.8","v1.18.2","1.18.2","v1.19.0-pre.0","1.19.0-pre.0","v1.18.1","1.18.1","v1.17.7","1.17.7","v1.18.0","1.18.0","v1.17.6","1.17.6","v1.17.5","1.17.5","v1.18.0-pre.3","1.18.0-pre.3","v1.17.4","1.17.4","v1.18.0-pre.2","1.18.0-pre.2","v1.17.3","1.17.3","v1.18.0-pre.1","1.18.0-pre.1","v1.17.2","1.17.2","v1.18.0-pre.0","1.18.0-pre.0","v1.17.1","1.17.1","v1.17.0","1.17.0","v1.17.0-rc.2","1.17.0-rc.2","v1.17.0-rc.1","1.17.0-rc.1","v1.17.0-rc.0","1.17.0-rc.0","v1.17.0-pre.3","1.17.0-pre.3","v1.17.0-pre.2","1.17.0-pre.2","v1.17.0-pre.1","1.17.0-pre.1","v1.17.0-pre.0","1.17.0-pre.0","v1.16.0-rc.0","1.16.0-rc.0","v1.16.0-pre.3","1.16.0-pre.3","v1.16.0-pre.2","1.16.0-pre.2","v1.16.0-pre.1","1.16.0-pre.1","v1.16.0-pre.0","1.16.0-pre.0","v1.15.0-pre.3","1.15.0-pre.3","v1.15.0-pre.2","1.15.0-pre.2","v1.15.0-pre.1","1.15.0-pre.1","v1.15.0-pre.0","1.15.0-pre.0","v1.14.0-snapshot.5","v1.14.0-rc.0","1.14.0-rc.0","v1.14.0-snapshot.4","1.14.0-snapshot.4","v1.14.0-snapshot.3","1.14.0-snapshot.3","v1.14.0-snapshot.2","v1.14.0-pre.2","1.14.0-snapshot.2","1.14.0-pre.2","v1.14.0-snapshot.1","1.14.0-snapshot.1","v1.14.0-snapshot.0","1.14.0-snapshot.0","v1.13.0-rc3","1.13.0-rc3","v1.13.0-rc2","1.13.0-rc2","v1.13.0-rc1","1.13.0-rc1","v1.13.0-rc0","1.13.0-rc0","v1.12.0-rc2","1.12.0-rc2","v1.12.0-rc1","1.12.0-rc1","v1.12.0-rc0","1.12.0-rc0","v1.11.0-rc2","1.11.0-rc2","v1.11.0-rc1","1.11.0-rc1","v1.11.0-rc0","1.11.0-rc0","v1.10.0-rc0","1.10.0-rc0","v1.9.0-rc1","1.9.0-rc1","v1.9.0-rc0","1.9.0-rc0","v1.8.0-rc1","1.8.0-rc1","v1.7.0-rc2","v1.7.0-rc1","v1.6.0-rc3","v1.6.0-rc2","v1.6.0-rc1","v1.5.0-rc2","1.5.0-rc2","v1.5.0-rc1","v1.3.0-rc1","v0.13.25","v0.13.22","v0.13.21","v1.0.0-rc9","v0.13.20","v0.13.19","v0.13.18","v0.13.17","v0.13.16","v0.13.15","v1.0.0-rc8","v0.13.14","v1.0.0-rc7","v1.0.0-rc6","v0.13.10","v0.13.8","v1.0.0-rc5","v0.13.6","v0.13.5","v1.0.0-rc4","v0.13.4","v0.13.2","v0.13.1","v1.0.0-rc1","v0.10.0","v0.9.0-rc1","v0.8.2","v0.8.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-56742.json"}}],"schema_version":"1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