{"id":"CVE-2026-112778","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-112778","generatedAt":"2026-10-27T22:46:49.775Z","title":"Traefik before 2.11.46, 3.x before 3.6.17, and 3.7.0 lack namespace validation for Ingress and Service annotations in the Kubernetes Ingress provider, allowing references to Middlewares, ServersTransports, and TLSOptions in other namespaces.","description":"Traefik before 2.11.46, 3.x before 3.6.17, and 3.7.0 lack namespace validation for Ingress and Service annotations in the Kubernetes Ingress provider, allowing references to Middlewares, ServersTransports, and TLSOptions in other namespaces. Attackers able to create or update Ingress or Service resources in one namespace can set router.middlewares or service.serverstransport annotations to obtain another tenant's injected credentials or reuse its client certificates, bypassing namespace-based tenant isolation.","published":"2026-10-19T20:17:55.000Z","lastModified":"2026-10-23T17:04:02.000Z","status":"Analyzed","sourceIdentifier":"disclosure@vulncheck.com","cvss":{"version":"4.0","score":6.4,"severity":"MEDIUM","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:N/SC:L/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/M"},"cwe":["CWE-862"],"affected":["traefik/traefik"],"epss":{"score":0.00204,"percentile":0.10268,"date":"2026-10-26","history":[{"date":"2026-10-20","score":0.00188,"percentile":0.0792}]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"low","text":"Lower severity and a low EPSS score (0.20%). Track it; it rarely justifies an emergency change on its own."},"changes":[{"kind":"new","label":"New CVE","at":"2026-10-19T20:17:55.000Z","detail":{"score":"6.4","severity":"MEDIUM","publishedAt":"2026-10-19T20:17:55.187Z"},"summary":"New CVE, medium severity (CVSS 6.4)."}],"references":[{"url":"https://github.com/traefik/traefik/security/advisories/GHSA-rh7m-2m44-x32f","tags":["Vendor Advisory","Patch"],"source":"disclosure@vulncheck.com"},{"url":"https://www.vulncheck.com/advisories/traefik-before-2.11.46-3.6.17-and-3.7.1-cross-namespace-resource-reference-via-kubernetes-annotations","tags":["Third Party Advisory"],"source":"disclosure@vulncheck.com"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-112778","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}