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CVE-2026-65601

Estado: AnalizadaMedia (5.3)—

Traefik versions 3.7.0 through 3.7.6 contain a namespace confusion vulnerability in the Kubernetes Gateway API provider. When resolving HTTPRoute.spec.rules[].backendRefs[].filters[].extensionRef, Traefik used the backend Service namespace instead of the HTTPRoute namespace. A low-privileged route author holding a ReferenceGrant for a cross-namespace Service could therefore bind a Traefik Middleware from the backend namespace without a separate grant for that middleware, potentially injecting trusted reverse-proxy identity headers into downstream requests. The issue is fixed in version 3.7.7.

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

Tecnologías afectadas (1)

Traefik — Traefik

CWE

Referencias

JSON original (NVD)

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  "id": "CVE-2026-65601",
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          "options": [
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              "exploitation": "none"
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              "automatable": "no"
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              "technicalImpact": "partial"
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          "version": "2.0.3",
          "timestamp": "2026-07-23T13:51:09.038759Z"
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    "cvssMetricV40": [
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        "type": "Secondary",
        "source": "disclosure@vulncheck.com",
        "cvssData": {
          "Safety": "NOT_DEFINED",
          "version": "4.0",
          "Recovery": "NOT_DEFINED",
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          "Automatable": "NOT_DEFINED",
          "attackVector": "NETWORK",
          "baseSeverity": "MEDIUM",
          "valueDensity": "NOT_DEFINED",
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          "vulnerabilityResponseEffort": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
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              "versionType": "semver"
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  "published": "2026-07-22T12:18:20.430",
  "references": [
    {
      "url": "https://github.com/traefik/traefik/commit/26c96a3935cafb473f4a5bae1886560d9aa4e4f0",
      "tags": [
        "Patch"
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    },
    {
      "url": "https://github.com/traefik/traefik/security/advisories/GHSA-qq9q-x9w4-chhj",
      "tags": [
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    },
    {
      "url": "https://www.vulncheck.com/advisories/traefik-before-namespace-confusion-via-httproute-extensionref",
      "tags": [
        "Third Party Advisory"
      ],
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  ],
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  "weaknesses": [
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      "description": [
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          "value": "CWE-863"
        }
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      "lang": "en",
      "value": "Traefik versions 3.7.0 through 3.7.6 contain a namespace confusion vulnerability in the Kubernetes Gateway API provider. When resolving HTTPRoute.spec.rules[].backendRefs[].filters[].extensionRef, Traefik used the backend Service namespace instead of the HTTPRoute namespace. A low-privileged route author holding a ReferenceGrant for a cross-namespace Service could therefore bind a Traefik Middleware from the backend namespace without a separate grant for that middleware, potentially injecting trusted reverse-proxy identity headers into downstream requests. The issue is fixed in version 3.7.7."
    }
  ],
  "lastModified": "2026-08-06T15:36:09.777",
  "configurations": [
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          "negate": false,
          "cpeMatch": [
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              "versionStartIncluding": "3.7.0"
            }
          ],
          "operator": "OR"
        }
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  ],
  "sourceIdentifier": "disclosure@vulncheck.com"
}