CVE-2026-54891

Full vulnerability record from the local CVENow database.

Description

Improper Enforcement of Message Integrity During Transmission in a Communication Channel vulnerability in Erlang/OTP ssl (tls_gen_connection module) allows a network-positioned attacker to inject unauthenticated plaintext that the TLS client application later treats as authenticated server data. The function tls_gen_connection:handle_protocol_record/3 rejects APPLICATION_DATA records that arrive in pre-handshake states when the TLS endpoint acts as a server, but does not apply the same check when the endpoint acts as a client. A network-positioned attacker can send plaintext APPLICATION_DATA records to the client during the handshake. The records are buffered and, once the handshake completes successfully, delivered to the application as if they were authenticated post-handshake data. The attacker cannot observe the client's response or steer the connection, so the impact is limited to blind injection of unauthenticated bytes. The injection window is wider for TLS versions prior to TLS 1.3 than for TLS 1.3. This vulnerability is associated with program file lib/ssl/src/tls_gen_connection.erl. TLS 1.3 is affected starting with OTP 22.0, when TLS 1.3 support was added. This issue affects OTP from OTP 17.0 before OTP 27.3.4.14, from OTP 28.0 before OTP 28.5.0.3, and from OTP 29.0 before OTP 29.0.3, corresponding to ssl from 5.3.4 before 11.2.12.10, from 11.3 before 11.6.0.3, and from 11.7 before 11.7.3. Whether OTP before OTP 17.0, corresponding to ssl before 5.3.4, is affected is unknown.

Severity

MEDIUM

CVSS score

6.3 (v4.0)

Vulnerability status

Modified

Source identifier

6b3ad84c-e1a6-4bf7-a703-f496b71e49db

Published

2026-07-02 17:17:02.747000

Last modified

2026-10-25 21:10:00.770000

View original CVE JSON

{
  "id": "CVE-2026-54891",
  "sourceIdentifier": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
  "published": "2026-07-02T17:17:02.747",
  "lastModified": "2026-10-25T21:10:00.770",
  "vulnStatus": "Modified",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Improper Enforcement of Message Integrity During Transmission in a Communication Channel vulnerability in Erlang/OTP ssl (tls_gen_connection module) allows a network-positioned attacker to inject unauthenticated plaintext that the TLS client application later treats as authenticated server data.\n\nThe function tls_gen_connection:handle_protocol_record/3 rejects APPLICATION_DATA records that arrive in pre-handshake states when the TLS endpoint acts as a server, but does not apply the same check when the endpoint acts as a client. A network-positioned attacker can send plaintext APPLICATION_DATA records to the client during the handshake. The records are buffered and, once the handshake completes successfully, delivered to the application as if they were authenticated post-handshake data. The attacker cannot observe the client's response or steer the connection, so the impact is limited to blind injection of unauthenticated bytes. The injection window is wider for TLS versions prior to TLS 1.3 than for TLS 1.3.\n\nThis vulnerability is associated with program file lib/ssl/src/tls_gen_connection.erl.\n\nTLS 1.3 is affected starting with OTP 22.0, when TLS 1.3 support was added.\n\nThis issue affects OTP from OTP 17.0 before OTP 27.3.4.14, from OTP 28.0 before OTP 28.5.0.3, and from OTP 29.0 before OTP 29.0.3, corresponding to ssl from 5.3.4 before 11.2.12.10, from 11.3 before 11.6.0.3, and from 11.7 before 11.7.3. Whether OTP before OTP 17.0, corresponding to ssl before 5.3.4, is affected is unknown."
    },
    {
      "lang": "es",
      "value": "Vulnerabilidad de Aplicación Incorrecta de la Integridad del Mensaje Durante la Transmisión en un Canal de Comunicación en Erlang/OTP ssl (módulo tls_gen_connection) permite a un atacante posicionado en la red inyectar texto plano no autenticado que la aplicación cliente TLS trata posteriormente como datos de servidor autenticados.\n\nLa función tls_gen_connection:handle_protocol_record/3 rechaza los registros APPLICATION_DATA que llegan en estados de pre-handshake cuando el punto final TLS actúa como un servidor, pero no aplica la misma verificación cuando el punto final actúa como un cliente. Un atacante posicionado en la red puede enviar registros APPLICATION_DATA de texto plano al cliente durante el handshake. Los registros se almacenan en búfer y, una vez que el handshake se completa con éxito, se entregan a la aplicación como si fueran datos post-handshake autenticados. El atacante no puede observar la respuesta del cliente ni dirigir la conexión, por lo que el impacto se limita a la inyección ciega de bytes no autenticados. La ventana de inyección es más amplia para las versiones de TLS anteriores a TLS 1.3 que para TLS 1.3.\n\nEsta vulnerabilidad está asociada con el archivo de programa lib/ssl/src/tls_gen_connection.erl.\n\nEste problema afecta a OTP desde OTP 17.0 antes de 29.0.3, 28.5.0.3 y 27.3.4.14 correspondiente a ssl desde 5.3.4 antes de 11.7.3, 11.6.0.3 y 11.2.12.10. TLS 1.3 se ve afectado a partir de OTP 22.0, cuando se añadió el soporte para TLS 1.3."
    }
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          "packageURL": "pkg:github/erlang/otp",
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          "confidentialityRequirement": "NOT_DEFINED",
          "integrityRequirement": "NOT_DEFINED",
          "availabilityRequirement": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
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          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "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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