o6 Automation open62541 up to 1.4.16/1.5.4/master GetEndpoints Discovery Service endpointUrl allocation of resources

Summaryinfo

A vulnerability identified as problematic has been detected in o6 Automation open62541 up to 1.4.16/1.5.4/master. This affects an unknown part of the component GetEndpoints Discovery Service. The manipulation of the argument endpointUrl leads to allocation of resources. This vulnerability is traded as CVE-2026-11946. It is possible to initiate the attack remotely. There is no exploit available.

Detailsinfo

A vulnerability was found in o6 Automation open62541 up to 1.4.16/1.5.4/master. It has been rated as problematic. This issue affects some unknown functionality of the component GetEndpoints Discovery Service. The manipulation of the argument endpointUrl with an unknown input leads to a allocation of resources vulnerability. Using CWE to declare the problem leads to CWE-770. The product allocates a reusable resource or group of resources on behalf of an actor without imposing any restrictions on the size or number of resources that can be allocated, in violation of the intended security policy for that actor. Impacted is availability. The summary by CVE is:

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.

The weakness was shared by Lorenzo Cannella. It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2026-11946 since 06/10/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1499 according to MITRE ATT&CK.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Type

• Automation Software

Vendor

• o6 Automation

Name

• open62541

Version

• 1.4.0
• 1.4.1
• 1.4.2
• 1.4.3
• 1.4.4
• 1.4.5
• 1.4.6
• 1.4.7
• 1.4.8
• 1.4.9
• 1.4.10
• 1.4.11
• 1.4.12
• 1.4.13
• 1.4.14
• 1.4.15
• 1.4.16
• 1.5.0
• 1.5.1
• 1.5.2
• 1.5.3
• 1.5.4
• master

CPE 2.3info

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CPE 2.2info

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Entryinfo

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