{"schemaVersion":3,"id":"CVE-2026-48020","aliases":["GHSA-xf64-8mw2-4gr2","GO-2026-5752","openSUSE-SU-2026:11045-1"],"status":"published","duplicateOf":null,"title":"Traefik StripPrefix Route-Level Auth Bypass via Path Normalization","description":"Traefik is an HTTP reverse proxy and load balancer. Prior to 2.11.48, 3.6.19, and 3.7.3, there is a high severity vulnerability in Traefik's StripPrefix middleware that allows an unauthenticated attacker to bypass route-level authentication and authorization. When a public router matches on a PathPrefix rule and applies the StripPrefix middleware, a request path containing .. or its percent-encoded form %2e%2e can match the public route at routing time and then, after the prefix is stripped and the path is normalized, resolve to a path served by a separate, authenticated router. As a result, an attacker can reach protected backend paths — such as admin or internal configuration endpoints — without satisfying the authentication middleware attached to the protected router. This vulnerability is fixed in 2.11.48, 3.6.19, and 3.7.3.","dates":{"published":"2026-06-23T19:10:31.557Z","modified":"2026-09-02T12:04:29.915Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":10,"severity":"critical","version":"3.1","versionLabel":"v3.1","source":"NVD","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N","computed":false,"selection":"backend-summary"},"metrics":[{"version":"4.0","versionLabel":"v4.0","source":"CVE.org","score":7.8,"severity":"high","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"CVE.org","score":9.1,"severity":"critical","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","exploitability":null,"impact":null,"computed":false},{"version":"4.0","versionLabel":"v4.0","source":"OSV · Go","score":7.8,"severity":"high","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N","exploitability":null,"impact":null,"computed":true},{"version":"3.1","versionLabel":"v3.1","source":"OSV · Go","score":10,"severity":"critical","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N","exploitability":10,"impact":9.7,"computed":true},{"version":"4.0","versionLabel":"v4.0","source":"NVD","score":7.8,"severity":"high","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N/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","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"NVD","score":10,"severity":"critical","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N","exploitability":null,"impact":null,"computed":false}]},"epss":{"probability":0.00775,"percentile":0.55294,"severity":"low","asOf":"2026-10-22T00:00:00.000Z","change":{"pp":0,"baselineDate":"2026-09-22T00:00:00.000Z","baselineScore":0.00775},"history":[{"date":"2026-09-14T00:00:00.000Z","score":0.00775,"percentile":null},{"date":"2026-09-15T00:00:00.000Z","score":0.00775,"percentile":null},{"date":"2026-09-16T00:00:00.000Z","score":0.00775,"percentile":null},{"date":"2026-09-17T00:00:00.000Z","score":0.00775,"percentile":null},{"date":"2026-09-18T00:00:00.000Z","score":0.00775,"percentile":null},{"date":"2026-09-19T00:00:00.000Z","score":0.00775,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.00775,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.00775,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.00775,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.00775,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.00775,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.00775,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.00775,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.00775,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.00775,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.00775,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.00775,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.00775,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00775,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00775,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00775,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.00775,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.00775,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00775,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00775,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00775,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00775,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00775,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00775,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00775,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00775,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00775,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00775,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00775,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00775,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00775,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.00775,"percentile":null},{"date":"2026-10-21T00:00:00.000Z","score":0.00775,"percentile":null},{"date":"2026-10-22T00:00:00.000Z","score":0.00775,"percentile":0.55294}],"last30":[{"date":"2026-09-22T00:00:00.000Z","score":0.00775,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.00775,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.00775,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.00775,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.00775,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.00775,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.00775,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.00775,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.00775,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.00775,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00775,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00775,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00775,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.00775,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.00775,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00775,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00775,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00775,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00775,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00775,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00775,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00775,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00775,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00775,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00775,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00775,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00775,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00775,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.00775,"percentile":null},{"date":"2026-10-21T00:00:00.000Z","score":0.00775,"percentile":null},{"date":"2026-10-22T00:00:00.000Z","score":0.00775,"percentile":0.55294}]},"kev":{"state":"not-listed","entries":[],"listedCount":0,"totalCatalogs":3,"catalogs":[{"source":"cisa","label":"CISA","listed":false,"entry":null},{"source":"enisa","label":"ENISA","listed":false,"entry":null},{"source":"circl","label":"CIRCL","listed":false,"entry":null}]},"ransomware":{"state":"none-recorded","sources":[]},"exploits":[{"id":"GITHUB_TRAEFIK_TRAEFIK","name":"Traefik","source":"github","url":"https://github.com/traefik/traefik/security/advisories/GHSA-h2ph-vhm7-g4hp","maturity":"poc","reliabilityScore":0.3,"verified":false,"type":null,"platforms":[],"requiresAuth":null,"exploitdb":null,"metasploit":null}],"exploitCount":1,"weaknesses":[{"id":"CWE-288","name":"Authentication Bypass Using an Alternate Path or Channel","description":"The product requires authentication, but the product has an alternate path or channel that does not require authentication.","type":"weakness","status":"Incomplete","abstraction":"Base","likelihoodOfExploit":null,"url":"https://cwe.mitre.org/data/definitions/288.html"},{"id":"CWE-22","name":"Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')","description":"The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.","type":"weakness","status":"Stable","abstraction":"Base","likelihoodOfExploit":"High","url":"https://cwe.mitre.org/data/definitions/22.html"}],"affected":[{"vendor":"github.com/traefik","product":"traefik","name":"github.com/traefik/traefik","label":"traefik","ecosystem":"Go","cpePart":null,"purl":"pkg:golang/github.com/traefik/traefik","purlType":"golang","versions":[{"text":"All versions","noFixRecorded":true,"fixedIn":null}],"versionsText":"All versions (No fix recorded)","eol":null,"hubHref":null},{"vendor":"github.com/traefik/traefik","product":"v2","name":"github.com/traefik/traefik/v2","label":"v2","ecosystem":"Go","cpePart":null,"purl":"pkg:golang/github.com/traefik/traefik/v2","purlType":"golang","versions":[{"text":"< 2.11.48","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 2.11.48","eol":null,"hubHref":null},{"vendor":"github.com/traefik/traefik","product":"v3","name":"github.com/traefik/traefik/v3","label":"v3","ecosystem":"Go","cpePart":null,"purl":"pkg:golang/github.com/traefik/traefik/v3","purlType":"golang","versions":[{"text":"< 3.6.19","noFixRecorded":false,"fixedIn":null},{"text":"≥ 3.7.0-ea.1, < 3.7.3","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 3.6.19 | ≥ 3.7.0-ea.1, < 3.7.3","eol":null,"hubHref":null},{"vendor":"opensuse","product":"traefik2&distro=openSUSE Tumbleweed","name":"traefik2","label":"traefik2&distro=openSUSE Tumbleweed","ecosystem":"openSUSE","cpePart":null,"purl":"pkg:rpm/opensuse/traefik2&distro=openSUSE Tumbleweed","purlType":"rpm","versions":[{"text":"< 2.11.50-1.1","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 2.11.50-1.1","eol":null,"hubHref":null},{"vendor":"traefik","product":"traefik","name":"traefik","label":"traefik","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ 3.7.0-ea.1, < 3.7.3","noFixRecorded":false,"fixedIn":null},{"text":"≥ 3.0.0-beta1, < 3.6.19","noFixRecorded":false,"fixedIn":null},{"text":"< 2.11.48","noFixRecorded":false,"fixedIn":null},{"text":"≥ 3.0.0, < 3.6.19","noFixRecorded":false,"fixedIn":null},{"text":"≥ 3.7.0, < 3.7.3","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 3.7.0-ea.1, < 3.7.3 | ≥ 3.0.0-beta1, < 3.6.19 | < 2.11.48 | ≥ 3.0.0, < 3.6.19 | ≥ 3.7.0, < 3.7.3","eol":{"isEol":null,"eolDate":null,"matchMethod":"cpe","cycle":null,"product":{"name":"traefik","label":"Traefik","category":"server-app"}},"hubHref":"/vendor/traefik/traefik"}],"affectedCount":5,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://github.com/traefik/traefik/security/advisories/GHSA-xf64-8mw2-4gr2","label":"github.com/traefik/traefik/security/advisories/GHSA-xf64-8mw2-4gr2","hostname":"github.com","tags":["X Refsource CONFIRM","WEB","Advisory","Exploit","Mitigation","Patch","Vendor Advisory"]},{"url":"https://github.com/traefik/traefik/releases/tag/v2.11.48","label":"github.com/traefik/traefik/releases/tag/v2.11.48","hostname":"github.com","tags":["X Refsource MISC","WEB","Patch","Release Notes"]},{"url":"https://github.com/traefik/traefik/releases/tag/v3.6.19","label":"github.com/traefik/traefik/releases/tag/v3.6.19","hostname":"github.com","tags":["X Refsource MISC","WEB","Patch","Release Notes"]},{"url":"https://github.com/traefik/traefik/releases/tag/v3.7.3","label":"github.com/traefik/traefik/releases/tag/v3.7.3","hostname":"github.com","tags":["X Refsource MISC","WEB","Patch","Release Notes"]},{"url":"https://access.redhat.com/security/cve/CVE-2026-48020","label":"access.redhat.com/security/cve/CVE-2026-48020","hostname":"access.redhat.com","tags":["VDB Entry","X Refsource REDHAT","WEB"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2491915","label":"bugzilla.redhat.com/show_bug.cgi?id=2491915","hostname":"bugzilla.redhat.com","tags":["Issue Tracking","X Refsource REDHAT","WEB"]},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-48020.json","label":"security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-48020.json","hostname":"security.access.redhat.com","tags":["X Sadp Csaf Vex","WEB"]},{"url":"https://access.redhat.com/errata/RHSA-2026:62260","label":"access.redhat.com/errata/RHSA-2026:62260","hostname":"access.redhat.com","tags":["Vendor Advisory","X Refsource REDHAT","WEB"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-48020","label":"nvd.nist.gov/vuln/detail/CVE-2026-48020","hostname":"nvd.nist.gov","tags":["Advisory"]},{"url":"https://github.com/traefik/traefik","label":"github.com/traefik/traefik","hostname":"github.com","tags":["PACKAGE"]},{"url":"https://www.suse.com/security/cve/CVE-2026-48020","label":"www.suse.com/security/cve/CVE-2026-48020","hostname":"www.suse.com","tags":["WEB"]}],"lineage":{"upstream":[],"downstream":["OPENSUSE-SU-2026:11047-1","OPENSUSE-SU-2026:21483-1"],"duplicates":[],"related":["OPENSUSE-SU-2026:11047-1","OPENSUSE-SU-2026:21483-1"]},"timeline":[{"kind":"published","date":"2026-06-23T19:10:31.557Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2026-09-02T12:04:29.915Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":90,"level":"critical","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-22T21:13:08.931Z","stale":false,"partial":false}}