{"id":"CVE-2026-15738","aliases":["EUVD-2026-44491"],"status":"published","title":"Cross-namespace traffic interception via incorrect route precedence ordering in AWS Load Balancer Controller","description":"Incorrect behavior order in the Gateway API listener-rule generation in Amazon AWS Load Balancer Controller before 3.4.2 might allow an authenticated remote user to intercept, spoof, or deny another namespace's gRPC traffic on a shared Gateway via a crafted HTTPRoute resource.\n\n\n\nTo mitigate this issue, users should upgrade to version 3.4.2.","severity":{"version":"4.0","score":5.8,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:H","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.00647,"percentile":0.51483,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-653"],"published":"2026-07-14T20:19:23Z","modified":"2026-10-28T02:30:34Z","products":[{"vendor":"amazon","product":"aws-load-balancer-controller"}],"references":[{"url":"https://github.com/kubernetes-sigs/aws-load-balancer-controller/releases/tag/v3.4.2","tags":["release-notes","advisory"]},{"url":"https://aws.amazon.com/security/security-bulletins/2026-055-aws/","tags":["vendor-advisory","advisory"]},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/15xxx/CVE-2026-15738.json","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-15738","tags":["advisory"]}],"sources":{"cve":[{"id":"CVE-2026-15738","title":"Cross-namespace traffic interception via incorrect route precedence ordering in AWS Load Balancer Controller","description":"Incorrect behavior order in the Gateway API listener-rule generation in Amazon AWS Load Balancer Controller before 3.4.2 might allow an authenticated remote user to intercept, spoof, or deny another namespace's gRPC traffic on a shared Gateway via a crafted HTTPRoute resource.\n\n\n\nTo mitigate this issue, users should upgrade to version 3.4.2.","status":"published","published":"2026-07-14T20:19:23.721Z","modified":"2026-07-15T13:01:51.239Z","cvss":[{"version":"4.0","score":5.8,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:H","level":"medium","assessor":"cna"},{"version":"3.1","score":8.5,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H","level":"high","assessor":"cna"}],"cwes":["CWE-653"],"updated_at":"2026-11-02T13:47:51.033687Z"}],"euvd":[{"id":"EUVD-2026-44491","description":"Incorrect behavior order in the Gateway API listener-rule generation in Amazon AWS Load Balancer Controller before 3.4.2 might allow an authenticated remote user to intercept, spoof, or deny another namespace's gRPC traffic on a shared Gateway via a crafted HTTPRoute resource.\n\n\n\nTo mitigate this issue, users should upgrade to version 3.4.2.","status":"published","published":"2026-07-14T20:19:23Z","modified":"2026-07-15T13:01:51Z","cvss":[{"version":"4.0","score":5.8,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:H","level":"medium"}],"updated_at":"2026-11-02T18:19:53.226345Z"}],"nvd":[{"id":"CVE-2026-15738","description":"Incorrect behavior order in the Gateway API listener-rule generation in Amazon AWS Load Balancer Controller before 3.4.2 might allow an authenticated remote user to intercept, spoof, or deny another namespace's gRPC traffic on a shared Gateway via a crafted HTTPRoute resource.\n\n\n\nTo mitigate this issue, users should upgrade to version 3.4.2.","status":"published","published":"2026-07-14T21:16:41.44Z","modified":"2026-10-24T21:10:00.13Z","cvss":[{"version":"4.0","score":5.8,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"medium","assessor":"secondary"},{"version":"3.1","score":8.5,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H","level":"high","assessor":"secondary"}],"cwes":["CWE-653"],"updated_at":"2026-11-02T14:12:29.879716Z"}],"osv":[{"id":"CVE-2026-15738","title":"Cross-namespace traffic interception via incorrect route precedence ordering in AWS Load Balancer Controller","description":"Incorrect behavior order in the Gateway API listener-rule generation in Amazon AWS Load Balancer Controller before 3.4.2 might allow an authenticated remote user to intercept, spoof, or deny another namespace's gRPC traffic on a shared Gateway via a crafted HTTPRoute resource.\n\n\n\nTo mitigate this issue, users should upgrade to version 3.4.2.","status":"published","published":"2026-07-14T20:19:23.721Z","modified":"2026-10-28T02:30:34.773834789Z","cvss":[{"version":"4.0","score":5.8,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:H","level":"medium"}],"cwes":["CWE-653"],"updated_at":"2026-11-02T15:44:57.682091Z"}]}}