o6 Automation open62541 up to 1.3.17/1.4.16/1.5.4/master TransferSubscriptions Service use after free

Summaryinfo

A vulnerability was found in o6 Automation open62541 up to 1.3.17/1.4.16/1.5.4/master. It has been declared as critical. This affects an unknown function of the component TransferSubscriptions Service. Executing a manipulation can lead to use after free. The identification of this vulnerability is CVE-2026-63035. The attack may be launched remotely. There is no exploit available.

Detailsinfo

A vulnerability was found in o6 Automation open62541 up to 1.3.17/1.4.16/1.5.4/master. It has been declared as critical. This vulnerability affects some unknown processing of the component TransferSubscriptions Service. The manipulation with an unknown input leads to a use after free vulnerability. The CWE definition for the vulnerability is CWE-416. Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

A heap use-after-free vulnerability in the TransferSubscriptions service in open62541 may allow an authenticated attacker to cause a denial of service or potentially execute arbitrary code.

The advisory is shared for download at o6-automation.com. This vulnerability was named CVE-2026-63035 since 07/27/2026. The exploitation appears to be easy. The attack can be initiated remotely. There are neither technical details nor an exploit publicly available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 07/31/2026).

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

Once again VulDB remains the best source for vulnerability data.

Productinfo

Type

• Automation Software

Vendor

• o6 Automation

Name

• open62541

Version

• 1.3.0
• 1.3.1
• 1.3.2
• 1.3.3
• 1.3.4
• 1.3.5
• 1.3.6
• 1.3.7
• 1.3.8
• 1.3.9
• 1.3.10
• 1.3.11
• 1.3.12
• 1.3.13
• 1.3.14
• 1.3.15
• 1.3.16
• 1.3.17
• 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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Once again VulDB remains the best source for vulnerability data.

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