High
Traefik: Rootless HTTP/1 request-target routes as "/" but is forwarded verbatim, bypassing path-scoped routing, middleware guards and access logging
Type: advisorySources: OSV
Traefik is an open source HTTP reverse proxy and load balancer. Prior to 2.11.57, and 3.7.13, Traefik accepts a rootless HTTP/1 request target that Go stores in URL.Opaque while leaving URL.Path empty. The rewriteRequestBuilder path evaluates routing, path sanitization, forwardAuth, encodedCharacters, and access logging against a path normalized to / but forwards URL.Opaque verbatim to the backend, allowing cross-vhost routing bypass, path-scoped authorization bypass, and access-log evasion when the backend interprets the opaque target as a path. This issue is fixed in 2.11.57 and 3.7.13.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-88009
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 4 Nov 2026, 23:21 UTC · Revision 1
Source evidence
Traefik: Rootless HTTP/1 request-target routes as "/" but is forwarded verbatim, bypassing path-scoped routing, middleware guards and access logging
core-osv · Original sourcePublished 10 Sept 2026, 15:01 UTC
Traefik is an open source HTTP reverse proxy and load balancer. Prior to 2.11.57, and 3.7.13, Traefik accepts a rootless HTTP/1 request target that Go stores in URL.Opaque while leaving URL.Path empty. The rewriteRequestBuilder path evaluates routing, path sanitization, forwardAuth, encodedCharacters, and access logging against a path normalized to / but forwards URL.Opaque verbatim to the backend, allowing cross-vhost routing bypass, path-scoped authorization bypass, and access-log evasion when the backend interprets the opaque target as a path. This issue is fixed in 2.11.57 and 3.7.13.
osv:CVE-2026-88009
Complete source record
{
"id": "691215bb5592dd7b3570824cb610d6a135cf69de039643c31d023877228ac254",
"url": "https://osv.dev/vulnerability/CVE-2026-88009",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "Traefik: Rootless HTTP/1 request-target routes as \"/\" but is forwarded verbatim, bypassing path-scoped routing, middleware guards and access logging",
"summary": "Traefik is an open source HTTP reverse proxy and load balancer. Prior to 2.11.57, and 3.7.13, Traefik accepts a rootless HTTP/1 request target that Go stores in URL.Opaque while leaving URL.Path empty. The rewriteRequestBuilder path evaluates routing, path sanitization, forwardAuth, encodedCharacters, and access logging against a path normalized to / but forwards URL.Opaque verbatim to the backend, allowing cross-vhost routing bypass, path-scoped authorization bypass, and access-log evasion when the backend interprets the opaque target as a path. This issue is fixed in 2.11.57 and 3.7.13.",
"evidence": "osv:CVE-2026-88009",
"products": [],
"severity": "high",
"structured": {
"id": "CVE-2026-88009",
"aliases": [
"CVE-2026-88009",
"GHSA-f52w-8j3h-j724",
"GO-2026-6465"
],
"metrics": [
{
"type": "CVSS_V4",
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/traefik/traefik",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"fixed": "839eb7f48a16849f22762b7e3bdfc58253146cd7"
},
{
"introduced": "d99d2f95e66a28ee8180634dc80fdf13ba68c62a"
},
{
"fixed": "fc92cc118a0557a029c7019d5ee06665127b0f13"
},
{
"fixed": "58d1e9ca204526823211e30fd4634101c59d58e9"
}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:traefik:traefik:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "0"
},
{
"fixed": "2.11.57"
}
],
"source": "CPE_RANGE"
},
{
"cpe": "cpe:2.3:a:traefik:traefik:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "3.0.0"
},
{
"fixed": "3.7.13"
}
],
"source": "CPE_RANGE"
},
{
"range": [
{
"fixed": "58d1e9ca204526823211e30fd4634101c59d58e9"
}
],
"source": "REFERENCES_COMMIT"
},
{
"range": [
{
"fixed": "839eb7f48a16849f22762b7e3bdfc58253146cd7"
}
],
"source": "REFERENCES_TAG",
"original_tag": "v2.11.57"
},
{
"range": [
{
"fixed": "fc92cc118a0557a029c7019d5ee06665127b0f13"
}
],
"source": "REFERENCES_TAG",
"original_tag": "v3.7.13"
}
]
}
}
],
"versions": [
"v2.11.56",
"v3.7.12",
"v3.7.11",
"v2.11.55",
"v2.11.54",
"v3.7.10",
"v3.7.9",
"v2.11.53",
"v3.7.8",
"v2.11.52",
"v3.7.7",
"v3.7.6",
"v2.11.51",
"v2.11.50",
"v3.7.5",
"v2.11.49",
"v3.7.4",
"v3.7.3",
"v2.11.48",
"v3.7.2",
"v2.11.47",
"v3.7.1",
"v2.11.46",
"v2.11.45",
"v3.7.0",
"v2.11.44",
"v3.7.0-rc.3",
"v2.11.43",
"v3.7.0-rc.2",
"v2.11.42",
"v3.7.0-rc.1",
"v3.7.0-ea.3",
"v3.7.0-ea.1",
"v3.7.0-ea.2",
"v2.11.41",
"v2.11.40",
"v2.11.39",
"v2.11.38",
"v2.11.37",
"v2.11.36",
"v2.11.35",
"v2.11.34",
"v2.11.33",
"v2.11.32",
"v2.11.31",
"v3.6.0-rc1",
"v2.11.30",
"v2.11.29",
"v2.11.28",
"v2.11.27",
"v3.5.0-rc1",
"v2.11.26",
"v2.11.25",
"v2.11.24",
"v2.11.23",
"v2.11.22",
"v3.4.0-rc1",
"v2.11.21",
"v2.11.20",
"v2.11.19",
"v2.11.18",
"v2.11.17",
"v2.11.16",
"v3.3.0-rc1",
"v2.11.15",
"v2.11.14",
"v2.11.13",
"v3.2.0-rc1",
"v2.11.12",
"v2.11.11",
"v2.11.10",
"v2.11.9",
"v2.11.8",
"v2.11.7",
"v3.1.0-rc1",
"v2.11.6",
"v2.11.5",
"v2.11.4",
"v2.11.3",
"v2.11.2",
"v2.11.1",
"v2.11.0",
"v2.11.0-rc2",
"v2.11.0-rc1",
"v2.10.7",
"v2.10.6",
"v2.10.5",
"v2.10.4",
"v2.10.3",
"v2.10.2",
"v2.10.1",
"v2.10.0",
"v2.10.0-rc2",
"v3.0.0-beta2",
"v2.10.0-rc1",
"v2.9.8",
"v2.9.7",
"v2.9.6",
"v3.0.0-beta1",
"v2.9.5",
"v2.9.4",
"v2.9.3",
"v2.9.2",
"v2.9.1",
"v2.9.0-rc5",
"v2.9.0-rc4",
"v2.9.0-rc1",
"v2.9.0-rc3",
"v2.9.0-rc2",
"v2.8.0-rc1",
"v2.7.0",
"v2.7.0-rc2",
"v2.7.0-rc1",
"v2.6.0-rc1",
"v2.5.0-rc1",
"v2.4.8",
"v2.4.7",
"v2.4.6",
"v2.4.5",
"v2.4.4",
"v2.4.3",
"v2.4.2",
"v2.4.1",
"v2.4.0",
"v2.4.0-rc2",
"v2.4.0-rc1",
"v2.3.0-rc1",
"v2.2.0-rc4",
"v2.2.0-rc3",
"v2.2.0-rc2",
"v2.2.0-rc1",
"v2.1.0-rc2",
"v2.1.0-rc1",
"v2.0.0-alpha1",
"v1.7.0-rc1",
"v1.6.0-rc1",
"v1.5.0-rc1",
"v1.4.0-rc1",
"v1.3.0-rc1",
"v1.1.0-rc1",
"v1.0.0",
"v1.0.0-rc3",
"v1.0.0-rc2",
"v1.0.0-rc1",
"v1.0.0-beta.809",
"v1.0.0-beta.804",
"v1.0.0-beta.794",
"v1.0.0-beta.784",
"v1.0.0-beta.771",
"v1.0.0-beta.767",
"v1.0.0-beta.756",
"v1.0.0-beta.754",
"v1.0.0-beta.744",
"v1.0.0-beta.732",
"v1.0.0-beta.723",
"v1.0.0-beta.721",
"v1.0.0-beta.712",
"v1.0.0-beta.704",
"v1.0.0-beta.695",
"v1.0.0-beta.692",
"v1.0.0-beta.682",
"v1.0.0-beta.676",
"v1.0.0-beta.673",
"v1.0.0-beta.666",
"v1.0.0-beta.652",
"v1.0.0-beta.644",
"v1.0.0-beta.621",
"v1.0.0-beta.614",
"v1.0.0-beta.610",
"v1.0.0-beta.601",
"v1.0.0-beta.582",
"v1.0.0-beta.576",
"v1.0.0-beta.573",
"v1.0.0-beta.555",
"v1.0.0-beta.548",
"v1.0.0-beta.545",
"v1.0.0-beta.524",
"v1.0.0-beta.513",
"v1.0.0-beta.508",
"v1.0.0-beta.505",
"v1.0.0-beta.484",
"v1.0.0-beta.481",
"v1.0.0-beta.475",
"v1.0.0-beta.470",
"v1.0.0-beta.453",
"v1.0.0-beta.442",
"v1.0.0-beta.440",
"v1.0.0-beta.436",
"v1.0.0-beta.433",
"v1.0.0-beta.427",
"v1.0.0-beta.421",
"v1.0.0-beta.416",
"v1.0.0-beta.408",
"v1.0.0-beta.404",
"v1.0.0-beta.395",
"v1.0.0-beta.392",
"v1.0.0-beta.374",
"v1.0.0-beta.366",
"v1.0.0-beta.355",
"v1.0.0-beta.352",
"v1.0.0-beta.341",
"v1.0.0-beta.339",
"v1.0.0-beta.324",
"v1.0.0-beta.300",
"v1.0.0-beta.291",
"v1.0.0-beta.289",
"v1.0.0-beta.287",
"v1.0.0-beta.280",
"v1.0.0-beta.277",
"v1.0.0-beta.254",
"v1.0.0-beta.247",
"v1.0.0-beta.224",
"v1.0.0-beta.220",
"v1.0.0-beta.212",
"v1.0.0-beta.211",
"v1.0.alpha.4c447985b63f8c90dcbde70b2eaef19d9a8c5ad2",
"v1.0.alpha.9830086790caf40ce30eb9ed5d317917f8157708",
"v1.0.alpha.3af21612b65fc578585a98c30090d1e613f791eb",
"v1.0.alpha.a458018aa2ccb637abacfc696157e00321cf982f",
"v1.0.alpha.4ded2682d2831ed703282b2f4585e17a62ee258e",
"v1.0.alpha.0e683cc5355bc507dabac68bbc7559d3f179e185",
"v1.0.alpha.11781087cadf9068d1d0b43902b6161ee10ea458",
"v1.0.alpha.b42b170ad29a0f042ddee0f5a5098aa9a59a9c8e",
"v1.0.alpha.a00eb81f0301f5e61024dea3b92ba632d6a61a8b",
"v1.0.alpha.6c3c5578c64125838abbc437a0242e1742d6f47a",
"v1.0.alpha.b84b95fe97df5c0f234d8693fbff03fa0d6a441b",
"v1.0.alpha.1a5668377cc840a35d233a0eb817ee9bacf0ba3e",
"v1.0.alpha.331cd173ce8ad858d767510fbcbc653e2dde657d",
"v1.0.alpha.e0872b61579c8e6b8fc6124c8836660c11840f5d",
"v1.0.alpha.99646544953d5793f18ccb22dae2458be4ba0e05",
"v1.0.alpha.7acc2beae0f0235d9408e8ed7a51f0ef3dae3aff",
"v1.0.alpha.ac56c1310c46f9c18dcad9d7ec680926fae821bb",
"v1.0.alpha.71b0e27517841ec7b911bafb109846ee96109f30",
"v1.0.alpha.60e9282f0adac48cbf283306ceb08ad7a31ac94b",
"v1.0.alpha.522",
"v1.0.alpha.516",
"v1.0.alpha.506",
"v1.0.alpha.481",
"v1.0.alpha.477",
"v1.0.alpha.471",
"v1.0.alpha.469",
"v1.0.alpha.463",
"v1.0.alpha.450",
"v1.0.alpha.443",
"v1.0.alpha.439",
"v1.0.alpha.425",
"v1.0.alpha.421",
"v1.0.alpha.412",
"v1.0.alpha.418",
"v1.0.alpha.404",
"v1.0.alpha.392",
"v1.0.alpha.374",
"v1.0.alpha.367",
"v1.0.alpha.364",
"v1.0.alpha.361",
"v1.0.alpha.358",
"v1.0.alpha.357",
"v1.0.alpha.341",
"v1.0.alpha.338",
"v1.0.alpha.336",
"v1.0.alpha.333",
"v1.0.alpha.329",
"v1.0.alpha.311",
"v1.0.alpha.306",
"v1.0.alpha.302",
"v1.0.alpha.291",
"v1.0.alpha.290",
"v1.0.alpha.288",
"v1.0.alpha.285",
"v1.0.alpha.275",
"v1.0.alpha.274",
"v1.0.alpha.273",
"v1.0.alpha.272",
"v1.0.alpha.271",
"v1.0.alpha.270",
"v1.0.alpha.269",
"v1.0.alpha.268",
"v1.0.alpha.267",
"v1.0.alpha.266",
"v1.0.alpha.263",
"v1.0.alpha.257",
"v1.0.alpha.256",
"v1.0.alpha.252",
"v1.0.alpha.251",
"v1.0.alpha.250",
"v1.0.alpha.249",
"v1.0.alpha.247",
"v1.0.alpha.228",
"v1.0.alpha.217",
"v1.0.alpha.216",
"v1.0.alpha.215",
"v1.0.alpha.212",
"v1.0.alpha.200",
"v1.0.alpha.186",
"v1.0.alpha.182",
"v1.0.alpha.178",
"v1.0.alpha.176",
"v1.0.alpha.171",
"v1.0.alpha.170",
"v1.0.alpha.164",
"v1.0.alpha.157",
"v1.0"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-88009.json"
}
}
],
"modified": "2026-10-28T02:30:40.570915995Z",
"provider": "osv",
"references": [
"https://github.com/traefik/traefik/releases/tag/v2.11.57",
"https://github.com/traefik/traefik/releases/tag/v3.7.13",
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/88xxx/CVE-2026-88009.json",
"https://github.com/traefik/traefik/security/advisories/GHSA-f52w-8j3h-j724",
"https://nvd.nist.gov/vuln/detail/CVE-2026-88009",
"https://github.com/traefik/traefik/commit/58d1e9ca204526823211e30fd4634101c59d58e9",
"https://github.com/traefik/traefik/pull/13796"
],
"provider_metadata": {
"cwe_ids": [
"CWE-1286",
"CWE-444"
],
"cna_assigner": "GitHub_M",
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/88xxx/CVE-2026-88009.json"
}
},
"related_cves": [
{
"value": "CVE-2026-88009",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 507939,
"published_at": "2026-09-10T15:01:56.971+00:00"
}