CVE-2026-71317

{
  "id": "CVE-2026-71317",
  "sourceIdentifier": "[email protected]",
  "published": "2026-08-18T20:17:23.910",
  "lastModified": "2026-10-22T22:10:00.250",
  "vulnStatus": "Deferred",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Lemur manages TLS certificate creation. Prior to 1.9.3, POST /api/1/authorities with type=subca did not require AuthorityPermission on the parent authority when ADMIN_ONLY_AUTHORITY_CREATION was false. AssociatedAuthoritySchema resolved the caller-supplied parent and passed it through authority creation to cryptography-issuer, which used the parent authority_certificate.private_key to sign a new intermediate. Any authenticated non-read-only user in that supported configuration could chain a sub-CA to an internal root for which the user held no role. The resulting intermediate could issue trusted certificates and its private key could be used outside Lemur, bypassing normal issuance controls. The fix checks AuthorityPermission on every supplied parent before invoking the issuer. This issue is fixed in version 1.9.3."
    },
    {
      "lang": "es",
      "value": "Lemur gestiona la creación de certificados TLS. Antes de la versión 1.9.3, POST /API/1/authorities con type=subca no requería AuthorityPermission en la autoridad padre cuando ADMIN_ONLY_AUTHORITY_CREATION era falso. AssociatedAuthoritySchema resolvía el padre proporcionado por el llamador y lo pasaba a través de la creación de autoridad a cryptography-issuer, que utilizaba la clave privada de authority_certificate del padre para firmar un nuevo intermedio. Cualquier usuario autenticado no de solo lectura en esa configuración compatible podía encadenar una sub-CA a una raíz interna para la cual el usuario no tenía ningún rol. El intermedio resultante podía emitir certificados de confianza y su clave privada podía utilizarse fuera de Lemur, eludiendo los controles de emisión normales. La solución verifica AuthorityPermission en cada padre suministrado antes de invocar al emisor. Este problema está solucionado en la versión 1.9.3."
    }
  ],
  "affected": [
    {
      "source": "[email protected]",
      "affectedData": [
        {
          "vendor": "Netflix",
          "product": "lemur",
          "versions": [
            {
              "version": "< 1.9.3",
              "status": "affected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV31": [
      {
        "source": "[email protected]",
        "type": "Secondary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:N",
          "baseScore": 6.5,
          "baseSeverity": "MEDIUM",
          "attackVector": "LOCAL",
          "attackComplexity": "LOW",
          "privilegesRequired": "LOW",
          "userInteraction": "NONE",
          "scope": "CHANGED",
          "confidentialityImpact": "NONE",
          "integrityImpact": "HIGH",
          "availabilityImpact": "NONE"
        },
        "exploitabilityScore": 2.0,
        "impactScore": 4.0
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "timestamp": "2026-08-19T15:17:29.453382Z",
          "id": "CVE-2026-71317",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "version": "2.0.3"
        }
      }
    ]
  },
  "weaknesses": [
    {
      "source": "[email protected]",
      "type": "Secondary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-862"
        }
      ]
    }
  ],
  "references": [
    {
      "url": "https://github.com/Netflix/lemur/commit/8669011203ca3dd89d9e39bab9ef6850eca723f9",
      "source": "[email protected]"
    },
    {
      "url": "https://github.com/Netflix/lemur/releases/tag/v1.9.3",
      "source": "[email protected]"
    },
    {
      "url": "https://github.com/Netflix/lemur/security/advisories/GHSA-g7p5-89mh-248h",
      "source": "[email protected]"
    },
    {
      "url": "https://github.com/Netflix/lemur/security/advisories/GHSA-g7p5-89mh-248h",
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"
    }
  ]
}