{"id":"CVE-2026-71325","title":"Traefik is an open-source edge router that makes publishing services a fun and easy experience","summary":"Traefik is an open-source edge router that makes publishing services a fun and easy experience. Prior to 2.11.54, 3.6.25, and 3.7.10, cross-namespace @kubernetescrd references are not rejected for TraefikService backend references resolv…","severity":"medium","cvss":4.4,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N","cwe":["CWE-653","CWE-863"],"vendor":"traefik","product":"traefik","affected":["traefik < 2.11.54","traefik >= 3.0.0, < 3.6.25","traefik >= 3.7.0, <= 3.7.10"],"patched":["traefik 3.6.25"],"published":"2026-08-06","updated":"2026-09-16","sourceUpdated":"2026-09-16T20:46:01.890","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-71325","references":[{"url":"https://github.com/traefik/traefik/commit/65ebf4b47fbdc33e3856803a5844a404e094d52d","label":"security-advisories@github.com"},{"url":"https://github.com/traefik/traefik/releases/tag/v2.11.54","label":"security-advisories@github.com"},{"url":"https://github.com/traefik/traefik/releases/tag/v3.6.25","label":"security-advisories@github.com"},{"url":"https://github.com/traefik/traefik/releases/tag/v3.7.10","label":"security-advisories@github.com"},{"url":"https://github.com/traefik/traefik/security/advisories/GHSA-62fc-8686-hfmq","label":"security-advisories@github.com"},{"url":"https://github.com/advisories/GHSA-62fc-8686-hfmq"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-71325.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-71325"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2512238"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-71325"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-71325"}],"tags":["nvd","ghsa","go","csaf","vex","red-hat","score-dispute"],"epss":0.00155,"epssPercentile":0.03912,"aliases":["GHSA-62fc-8686-hfmq"],"ecosystem":"go","ingestedAt":"2026-08-06T17:00:12.775Z","scores":{"nvd":4.4,"vendor":8.7},"slug":"CVE-2026-71325","body":"## Overview\n\nTraefik is an open-source edge router that makes publishing services a fun and easy experience. Prior to 2.11.54, 3.6.25, and 3.7.10, cross-namespace @kubernetescrd references are not rejected for TraefikService backend references resolved by the service resolver. A tenant confined by RBAC to a single namespace can therefore bind its own router to a TraefikService owned by another namespace and expose or reroute that namespace's backend, defeating the namespace isolation allowCrossNamespace=false is meant to enforce. This issue is fixed in version 2.11.54, 3.6.25, 3.7.10.\n\n## Affected\n\n- `traefik < 2.11.54`\n- `traefik >= 3.0.0, < 3.6.25`\n- `traefik >= 3.7.0, <= 3.7.10`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `traefik 3.6.25`\n\n## Package advisory (CVE-2026-71325)\n\nAffected packages:\n\n- `github.com/traefik/traefik/v2 <= 2.11.53`\n- `github.com/traefik/traefik/v3 >= 3.0.0, <= 3.6.24`\n- `github.com/traefik/traefik/v3 >= 3.7.0, <= 3.7.9`\n- `github.com/traefik/traefik <= 1.7.34`\n\nPatched in:\n\n- `github.com/traefik/traefik/v2 2.11.54`\n- `github.com/traefik/traefik/v3 3.6.25`\n- `github.com/traefik/traefik/v3 3.7.10`\n\nSource: https://github.com/advisories/GHSA-62fc-8686-hfmq\n\n## Vendor advisories\n\n- **Red Hat VEX** · Important · affected: Red Hat OpenShift Dev Spaces · no fix planned: Red Hat OpenShift Dev Spaces · updated 2026-09-16 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-71325.json)","depth":"sunlit","depthScore":24,"depthScoreParts":{"impact":24.2,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":205757,"id":"CVE-2026-71325","ts":1789592771776,"field":"cvss","old":null,"new":"4.4"}]}