CVE-2026-55162

{
  "id": "CVE-2026-55162",
  "sourceIdentifier": "[email protected]",
  "published": "2026-08-18T19:16:58.217",
  "lastModified": "2026-10-22T22:10:00.250",
  "vulnStatus": "Deferred",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Lemur manages TLS certificate creation. Prior to 1.9.2, lemur/certificates/verify.py accepted CRL Distribution Point and OCSP responder URLs from uploaded certificate extensions and used them in crl_verify and ocsp_verify without adequate destination validation. An authenticated operator could submit a certificate through POST /api/1/certificates/upload and cause verify_string to reach loopback, RFC1918, link-local, or instance-metadata destinations such as 169.254.169.254. The requests could probe internal services and create side effects from the Lemur host network position. The CRL path also used an unbounded cache, allowing attacker-controlled entries to persist and consume memory. The fix validates destinations, supports explicit trusted-host allowlists, and bounds the CRL cache. This issue is fixed in version 1.9.2."
    },
    {
      "lang": "es",
      "value": "Lemur gestiona la creación de certificados TLS. Antes de la 1.9.2, lemur/certificates/verify.py aceptaba URL de puntos de distribución de CRL y de respondedores OCSP de extensiones de certificados cargados y las utilizaba en crl_verify y ocsp_verify sin una validación de destino adecuada. Un operador autenticado podría enviar un certificado a través de POST /API/1/certificates/upload y hacer que verify_string alcanzara destinos de loopback, RFC1918, link-local o de metadatos de instancia, como 169.254.169.254. Las solicitudes podrían sondear servicios internos y crear efectos secundarios desde la posición de red del host Lemur. La ruta CRL también utilizaba una caché ilimitada, permitiendo que entradas controladas por el atacante persistieran y consumieran memoria. La solución valida los destinos, admite listas blancas explícitas de hosts de confianza y limita la caché CRL. Este problema se corrige en la versión 1.9.2."
    }
  ],
  "affected": [
    {
      "source": "[email protected]",
      "affectedData": [
        {
          "vendor": "Netflix",
          "product": "lemur",
          "versions": [
            {
              "version": "< 1.9.2",
              "status": "affected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV31": [
      {
        "source": "[email protected]",
        "type": "Secondary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L",
          "baseScore": 6.3,
          "baseSeverity": "MEDIUM",
          "attackVector": "NETWORK",
          "attackComplexity": "LOW",
          "privilegesRequired": "LOW",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "LOW",
          "integrityImpact": "LOW",
          "availabilityImpact": "LOW"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 3.4
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "timestamp": "2026-08-19T15:15:14.131468Z",
          "id": "CVE-2026-55162",
          "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-918"
        }
      ]
    }
  ],
  "references": [
    {
      "url": "https://github.com/Netflix/lemur/commit/733714a2b00b2f72c3d460e440770e46a3ea9d6a",
      "source": "[email protected]"
    },
    {
      "url": "https://github.com/Netflix/lemur/releases/tag/v1.9.2",
      "source": "[email protected]"
    },
    {
      "url": "https://github.com/Netflix/lemur/security/advisories/GHSA-54vg-pfh7-jq95",
      "source": "[email protected]"
    },
    {
      "url": "https://github.com/Netflix/lemur/security/advisories/GHSA-54vg-pfh7-jq95",
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"
    }
  ]
}