CVE-2026-71272

{
  "id": "CVE-2026-71272",
  "sourceIdentifier": "309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c",
  "published": "2026-08-05T13:24:51.573",
  "lastModified": "2026-10-24T15:10:00.190",
  "vulnStatus": "Deferred",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Memos' webhook dispatch function safeDialContext (internal/webhook/webhook.go) resolves the target hostname via net.DefaultResolver.LookupHost and validates the resulting IPs against reserved ranges, but then dials net.JoinHostPort(host, port) using the original hostname rather than the already-validated IP address."
    },
    {
      "lang": "es",
      "value": "La función de despacho de webhook de Memos safeDialContext() (internal/webhook/webhook.go) resuelve el nombre de host de destino a través de net.DefaultResolver.LookupHost() y valida las direcciones IP resultantes contra rangos reservados, pero luego marca net.JoinHostPort(host, port) usando el nombre de host original en lugar de la dirección IP ya validada. Debido a que net.Dialer.DialContext() realiza su propia resolución DNS independiente, un atacante que controla el DNS para el nombre de host del webhook (por ejemplo, a través de un TTL corto) puede devolver una dirección IP pública y permitida durante la validación y una dirección IP interna diferente en el momento de la marcación - una clásica omisión de la protección SSRF por reencuadernación de DNS de tipo tiempo de verificación/tiempo de uso."
    }
  ],
  "affected": [
    {
      "source": "309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c",
      "affectedData": [
        {
          "vendor": "usememos",
          "product": "memos",
          "defaultStatus": "unaffected",
          "programFiles": [
            "internal/webhook/webhook.go"
          ],
          "versions": [
            {
              "version": "0",
              "lessThanOrEqual": "0.29.1",
              "versionType": "semver",
              "status": "affected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV31": [
      {
        "source": "309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c",
        "type": "Secondary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N",
          "baseScore": 8.5,
          "baseSeverity": "HIGH",
          "attackVector": "NETWORK",
          "attackComplexity": "LOW",
          "privilegesRequired": "LOW",
          "userInteraction": "NONE",
          "scope": "CHANGED",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "LOW",
          "availabilityImpact": "NONE"
        },
        "exploitabilityScore": 3.1,
        "impactScore": 4.7
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "timestamp": "2026-08-05T15:54:35.331224Z",
          "id": "CVE-2026-71272",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "version": "2.0.3"
        }
      }
    ]
  },
  "weaknesses": [
    {
      "source": "309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c",
      "type": "Secondary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-367"
        }
      ]
    }
  ],
  "references": [
    {
      "url": "https://github.com/usememos/memos",
      "source": "309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c"
    },
    {
      "url": "https://github.com/usememos/memos/blob/main/internal/webhook/webhook.go",
      "source": "309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c"
    }
  ]
}