{"cve":"CVE-2026-56742","nvd":{"published":"2026-07-15T20:17:51.850","modified":"2026-07-17T17:48:48.260","status":"Analyzed","description":"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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:L","score":8.9},"cwes":["CWE-862"],"references":["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/releases/tag/v1.17.17"],"products":["cilium:cilium"],"source":"nvd","synced_at":"2026-10-19T22:45:36.895656543+00:00"},"epss":{"cve":"CVE-2026-56742","score":0.00176,"percentile":0.07055,"date":"2026-11-01"},"kev":null,"osv":[{"id":"GHSA-w7c2-w76w-5hmj","url":"https://osv.dev/vulnerability/GHSA-w7c2-w76w-5hmj","summary":"Cilium: Namespaced HTTPRoutes can redirect traffic to other namespaces","modified":"2026-10-01T20:56:11.816067258Z","packages":[{"ecosystem":"Go","name":"github.com/cilium/cilium","purl":"pkg:golang/github.com/cilium/cilium","ranges":["<1.17.17"],"fixed":["1.17.17"]},{"ecosystem":"Go","name":"github.com/cilium/ciliumCilium","purl":"pkg:golang/github.com/cilium/ciliumCilium","ranges":[">=1.18.0 <1.18.11"],"fixed":["1.18.11"]},{"ecosystem":"Go","name":"github.com/cilium/cilium","purl":"pkg:golang/github.com/cilium/cilium","ranges":[">=1.19.0 <1.19.5"],"fixed":["1.19.5"]}]},{"id":"GO-2026-6596","url":"https://osv.dev/vulnerability/GO-2026-6596","summary":"Cilium: Namespaced HTTPRoutes can redirect traffic to other namespaces in github.com/cilium/cilium","modified":"2026-10-07T17:45:13.511612531Z","packages":[{"ecosystem":"Go","name":"github.com/cilium/cilium","purl":"pkg:golang/github.com/cilium/cilium","ranges":["<1.17.17",">=1.18.0 <1.18.11",">=1.19.0 <1.19.5"],"fixed":["1.17.17","1.18.11","1.19.5"]}]}],"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."]}