CVE-2026-54638

{
  "id": "CVE-2026-54638",
  "sourceIdentifier": "[email protected]",
  "published": "2026-07-28T23:17:08.617",
  "lastModified": "2026-10-23T23:10:00.157",
  "vulnStatus": "Deferred",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "gotd/td is a T Telegram MTProto API client in Go. Prior to 0.145.1, proto.UnencryptedMessage.Decode in proto/unencrypted_message.go read attacker controlled dataLen from an unauthenticated MTProto unencrypted packet and allocated make([]byte, dataLen) before checking the remaining buffer, allowing remote unauthenticated denial of service through excessive memory allocation and CPU or garbage collection pressure. This issue is fixed in version 0.145.1."
    },
    {
      "lang": "es",
      "value": "gotd/td es un cliente API MTProto de Telegram T en Go. Antes de la versión 0.145.1, proto.UnencryptedMessage.Decode en proto/unencrypted_message.go leía un dataLen controlado por el atacante de un paquete MTProto no cifrado no autenticado y asignaba make([]byte, dataLen) antes de verificar el búfer restante, lo que permitía una denegación de servicio remota no autenticada a través de una asignación excesiva de memoria y presión de CPU o de recolección de basura. Este problema se solucionó en la versión 0.145.1."
    }
  ],
  "affected": [
    {
      "source": "[email protected]",
      "affectedData": [
        {
          "vendor": "gotd",
          "product": "td",
          "versions": [
            {
              "version": "< 0.145.1",
              "status": "affected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV31": [
      {
        "source": "[email protected]",
        "type": "Secondary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
          "baseScore": 7.5,
          "baseSeverity": "HIGH",
          "attackVector": "NETWORK",
          "attackComplexity": "LOW",
          "privilegesRequired": "NONE",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "availabilityImpact": "HIGH"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 3.6
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "timestamp": "2026-07-29T14:20:16.425469Z",
          "id": "CVE-2026-54638",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "version": "2.0.3"
        }
      }
    ]
  },
  "weaknesses": [
    {
      "source": "[email protected]",
      "type": "Secondary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-770"
        },
        {
          "lang": "en",
          "value": "CWE-789"
        }
      ]
    }
  ],
  "references": [
    {
      "url": "https://github.com/gotd/td/commit/9d5d1f31ea5022d9798d84ccce15de2e91ba6baa",
      "source": "[email protected]"
    },
    {
      "url": "https://github.com/gotd/td/issues/1711",
      "source": "[email protected]"
    },
    {
      "url": "https://github.com/gotd/td/releases/tag/v0.145.1",
      "source": "[email protected]"
    },
    {
      "url": "https://github.com/gotd/td/security/advisories/GHSA-whmm-qj9r-wvr2",
      "source": "[email protected]"
    }
  ]
}