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CVE-2026-28810

Full vulnerability record from the local CVENow database.

Description

Generation of Predictable Numbers or Identifiers vulnerability in Erlang/OTP kernel (inet_res, inet_db modules) allows DNS Cache Poisoning. The built-in DNS resolver (inet_res) uses a sequential, process-global 16-bit transaction ID for UDP queries and does not implement source port randomization. Response validation relies almost entirely on this ID, making DNS cache poisoning practical for an attacker who can observe one query or predict the next ID. This conflicts with RFC 5452 recommendations for mitigating forged DNS answers. inet_res is intended for use in trusted network environments and with trusted recursive resolvers. Earlier documentation did not clearly state this deployment assumption, which could lead users to deploy the resolver in environments where spoofed DNS responses are possible. This vulnerability is associated with program files lib/kernel/src/inet_db.erl and lib/kernel/src/inet_res.erl. This issue affects OTP from OTP 17.0 before OTP 28.4.2, OTP 27.3.4.10 and OTP 26.2.5.19, corresponding to kernel from 3.0 before 10.6.2, 10.2.7.4 and 9.2.4.11.

Severity
MEDIUM
CVSS score
6.3 (v4.0)
Vulnerability status
Modified
Source identifier
6b3ad84c-e1a6-4bf7-a703-f496b71e49db
Published
2026-04-07 09:16:20.473000
Last modified
2026-10-26 21:10:00.170000
View original CVE JSON 
{
  "id": "CVE-2026-28810",
  "sourceIdentifier": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
  "published": "2026-04-07T09:16:20.473",
  "lastModified": "2026-10-26T21:10:00.170",
  "vulnStatus": "Modified",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Generation of Predictable Numbers or Identifiers vulnerability in Erlang/OTP kernel (inet_res, inet_db modules) allows DNS Cache Poisoning.\n\nThe built-in DNS resolver (inet_res) uses a sequential, process-global 16-bit transaction ID for UDP queries and does not implement source port randomization. Response validation relies almost entirely on this ID, making DNS cache poisoning practical for an attacker who can observe one query or predict the next ID. This conflicts with RFC 5452 recommendations for mitigating forged DNS answers.\n\ninet_res is intended for use in trusted network environments and with trusted recursive resolvers. Earlier documentation did not clearly state this deployment assumption, which could lead users to deploy the resolver in environments where spoofed DNS responses are possible.\n\nThis vulnerability is associated with program files lib/kernel/src/inet_db.erl and lib/kernel/src/inet_res.erl.\n\nThis issue affects OTP from OTP 17.0 before OTP 28.4.2, OTP 27.3.4.10 and OTP 26.2.5.19, corresponding to kernel from 3.0 before 10.6.2, 10.2.7.4 and 9.2.4.11."
    },
    {
      "lang": "es",
      "value": "Vulnerabilidad de generación de números o identificadores predecibles en el kernel de Erlang/OTP (módulos inet_res, inet_db) permite el envenenamiento de caché DNS.\n\nEl resolvedor DNS incorporado (inet_res) utiliza un ID de transacción secuencial, global para el proceso, de 16 bits para consultas UDP y no implementa la aleatorización del puerto de origen. La validación de la respuesta se basa casi por completo en este ID, haciendo que el envenenamiento de caché DNS sea práctico para un atacante que puede observar una consulta o predecir el siguiente ID. Esto entra en conflicto con las recomendaciones de la RFC 5452 para mitigar respuestas DNS falsificadas.\n\ninet_res está diseñado para su uso en entornos de red confiables y con resolvedores recursivos confiables. La documentación anterior no indicaba claramente esta suposición de despliegue, lo que podría llevar a los usuarios a desplegar el resolvedor en entornos donde las respuestas DNS falsificadas son posibles.\n\nEsta vulnerabilidad está asociada con los archivos de programa lib/kernel/src/inet_db.erl y lib/kernel/src/inet_res.erl.\n\nEste problema afecta a OTP desde OTP 17.0 hasta OTP 28.4.2, 27.3.4.10 y 26.2.5.19 correspondiente al kernel desde 3.0 hasta 10.6.2, 10.2.7.4 y 9.2.4.11."
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          "repo": "https://github.com/erlang/otp",
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          "modifiedAttackVector": "NOT_DEFINED",
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          "Safety": "NOT_DEFINED",
          "Automatable": "NOT_DEFINED",
          "Recovery": "NOT_DEFINED",
          "valueDensity": "NOT_DEFINED",
          "vulnerabilityResponseEffort": "NOT_DEFINED",
          "providerUrgency": "NOT_DEFINED"
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    "cvssMetricV31": [
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