o6 Automation open62541 up to 1.3.17/1.4.16/1.5.4/master arrayDimensions integer overflow

Summaryinfo

A vulnerability categorized as critical has been discovered in o6 Automation open62541 up to 1.3.17/1.4.16/1.5.4/master. Affected is an unknown function of the component arrayDimensions. The manipulation results in integer overflow. This vulnerability is identified as CVE-2026-65423. The attack can be executed remotely. There is not any exploit available.

Detailsinfo

A vulnerability classified as critical has been found in o6 Automation open62541 up to 1.3.17/1.4.16/1.5.4/master. Affected is an unknown functionality of the component arrayDimensions. The manipulation with an unknown input leads to a integer overflow vulnerability. CWE is classifying the issue as CWE-190. The product performs a calculation that can produce an integer overflow or wraparound, when the logic assumes that the resulting value will always be larger than the original value. This can introduce other weaknesses when the calculation is used for resource management or execution control. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

An integer overflow in the UA_Variant arrayDimensions product computation in open62541 may allow a remote attacker to trigger an out-of-bounds write.

The advisory is available at o6-automation.com. This vulnerability is traded as CVE-2026-65423 since 07/27/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The technical details are unknown and an exploit is not available. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (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.

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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

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