CVE-2026-11946

An unauthenticated remote attacker can exhaust server memory via the GetEndpoints Discovery Service in open62541. The endpointUrl field of GetEndpointsRequest is not validated for length. An attacker can declare an arbitrarily large string (up to ~4.09 GB via the UInt32 length field) delivered across intermediate chunks without ever sending the final chunk. The server buffers all chunks in RAM indefinitely until the SecureChannel times out. The attack is pre-session and bypasses all encryption configurations. The issue affects open62541: from 1.4.0 through 1.4.16, from 1.5.0 through 1.5.4, master.

CVSS v3 7.5 HIGH

7.5^/10

CVSS v3 : HIGH

Vector :

Exploitability : 3.9 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://github.com/open62541/open62541
https://github.com/open62541/open62541/pull/8142
https://github.com/open62541/open62541/pull/8142/changes/d253818d6c5e870e1db0e360b18138c8bdc809ae

Configurations

No configuration.

History

25 Oct 2026, 21:10

Type	Values Removed	Values Added
Summary		(es) Un atacante remoto no autenticado puede agotar la memoria del servidor a través del servicio de descubrimiento GetEndpoints en open62541. El campo endpointUrl de GetEndpointsRequest no se valida en cuanto a su longitud. Un atacante puede declarar una cadena arbitrariamente grande (hasta ~4.09 GB a través del campo de longitud UInt32) entregada a través de fragmentos intermedios sin enviar nunca el fragmento final. El servidor almacena en búfer todos los fragmentos en la RAM indefinidamente hasta que el SecureChannel agota el tiempo de espera. El ataque es pre-sesión y elude todas las configuraciones de cifrado. El problema afecta a open62541: desde 1.4.0 hasta 1.4.16, desde 1.5.0 hasta 1.5.4, master.

Information

Published : 2026-07-02 12:16

Updated : 2026-10-25 21:10

NVD link : CVE-2026-11946

Mitre link : CVE-2026-11946

CVE.ORG link : CVE-2026-11946

JSON object : View

Products Affected

No product.

CWE

CWE-770

Allocation of Resources Without Limits or Throttling

CWE-789

Memory Allocation with Excessive Size Value

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