o6 open62541 up to 1.5.5 ua_client_highlevel.c UA_Client_readNodeClassAttribute heap-based overflow

Summaryinfo

A vulnerability, which was classified as critical, was found in o6 open62541 up to 1.5.5. Impacted is the function UA_Client_readNodeClassAttribute of the file src/client/ua_client_highlevel.c. Executing a manipulation can lead to heap-based overflow. This vulnerability is handled as CVE-2026-18784. It is possible to launch the attack on the local host. Additionally, an exploit exists. The project closed the issue report, stating that this is not the official way to report a security vulnerability.

Detailsinfo

A vulnerability classified as critical was found in o6 open62541 up to 1.5.5. This vulnerability affects the function UA_Client_readNodeClassAttribute of the file src/client/ua_client_highlevel.c. The manipulation with an unknown input leads to a heap-based overflow vulnerability. The CWE definition for the vulnerability is CWE-122. A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc(). As an impact it is known to affect confidentiality, integrity, and availability.

The weakness was released by Chuan Wei (CarnegieMe) as 8139 as not defined issue. The advisory is available at github.com. The vendor was not involved in the coordination of the public release. This vulnerability was named CVE-2026-18784. The exploitation appears to be easy. Local access is required to approach this attack. Technical details and also a public exploit are known.

A public exploit has been developed by Chuan Wei (CarnegieMe) in Python. It is possible to download the exploit at github.com. It is declared as proof-of-concept. The project closed the issue report, stating that this is not the official way to report a security vulnerability.

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

If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Vendor

• o6

Name

• open62541

Version

• 1.5.0
• 1.5.1
• 1.5.2
• 1.5.3
• 1.5.4
• 1.5.5

CPE 2.3info

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CPE 2.2info

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Accepted

• Submit #857012: open62541 Project open62541 master (commit ca356b088ada7dee824d1b4acd07c1ff07ce242b) Heap-based Buffer Overflow (Out-of-Bounds Read) (by VULL)

If you want to get best quality of vulnerability data, you may have to visit VulDB.

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