o6 Automation open62541 up to 1.3.17/1.4.16/1.5.4/master PubSub integer underflow

Summaryinfo

A vulnerability was found in o6 Automation open62541 up to 1.3.17/1.4.16/1.5.4/master. It has been rated as problematic. This impacts an unknown function of the component PubSub. The manipulation leads to integer underflow. This vulnerability is referenced as CVE-2026-63362. Remote exploitation of the attack is possible. No exploit is 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 rated as problematic. This issue affects an unknown function of the component PubSub. The manipulation with an unknown input leads to a integer underflow vulnerability. Using CWE to declare the problem leads to CWE-191. The product subtracts one value from another, such that the result is less than the minimum allowable integer value, which produces a value that is not equal to the correct result. Impacted is availability. The summary by CVE is:

An unsigned integer underflow in the PubSub signature verification path in open62541 may allow a remote attacker to cause a denial of service via a crafted UDP packet.

The advisory is shared at o6-automation.com. The identification of this vulnerability is CVE-2026-63362 since 07/27/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Neither technical details nor an exploit are publicly available. The price for an exploit might be around 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.

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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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Entryinfo

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