CVE-2026-68552

Coturn is a free open source implementation of TURN and STUN Server. Prior to 4.15.0, an unauthenticated remote client can send a STUN message over TCP or TLS with a body-length field from 65520 through 65532, causing the uint16_t len variable in stun_get_message_len_str() in src/client/ns_turn_msg.c to wrap when STUN_HEADER_LENGTH is added. The framing layer then consumes only 4 through 16 bytes, treats the remaining bytes as another message, desynchronizes the stream parser, and drops the attacking client's connection. Other clients and the server process are not affected. This issue is fixed in version 4.15.0.

CVSS v3 5.3 MEDIUM

5.3^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 3.9 / Impact : 1.4

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact LOW

Scope UNCHANGED

References

Link	Resource
https://github.com/coturn/coturn/commit/ed32e1fb6c843f9cf9a28d91c541dfbf40874f25
https://github.com/coturn/coturn/pull/1964
https://github.com/coturn/coturn/releases/tag/4.15.0
https://github.com/coturn/coturn/security/advisories/GHSA-m562-mf7x-q7rr

Configurations

No configuration.

History

26 Oct 2026, 10:10

Type	Values Removed	Values Added
Summary		(es) Coturn es una implementación de código abierto gratuita de servidor TURN y STUN. Antes de la versión 4.15.0, un cliente remoto no autenticado puede enviar un mensaje STUN a través de TCP o TLS con un campo de longitud de cuerpo desde 65520 hasta 65532, lo que provoca que la variable uint16_t len en stun_get_message_len_str() en src/client/ns_turn_msg.c se desborde cuando se añade STUN_HEADER_LENGTH. La capa de enmarcado luego consume solo de 4 a 16 bytes, trata los bytes restantes como otro mensaje, desincroniza el analizador de flujo y cierra la conexión del cliente atacante. Otros clientes y el proceso del servidor no se ven afectados. Este problema está solucionado en la versión 4.15.0.

Information

Published : 2026-08-19 21:17

Updated : 2026-10-26 10:10

NVD link : CVE-2026-68552

Mitre link : CVE-2026-68552

CVE.ORG link : CVE-2026-68552

JSON object : View

Products Affected

No product.

CWE

CWE-190

Integer Overflow or Wraparound

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