CVE-2026-67863
Description
A flaw was found in open62541. A server-side use-after-free vulnerability exists in the local MonitoredItem callback path. This occurs when the system attempts to use a notification object after it has been deallocated. A remote attacker can exploit this vulnerability to cause a denial of service (DoS), making the affected system unavailable.
Statement
This Important flaw in open62541 allows a remote attacker to trigger a denial of service due to a use-after-free vulnerability in the server's MonitoredItem callback path. The issue arises from improper handling of notification objects after deallocation, leading to service unavailability. This is considered Important due to the potential for unauthenticated remote denial of service against affected open62541 server instances.
Understanding the Weakness (CWE)
Confidentiality
Technical Impact: Read Memory
If the expired pointer is used in a read operation, an attacker might be able to control data read in by the application.
Availability
Technical Impact: DoS: Crash, Exit, or Restart
If the expired pointer references a memory location that is not accessible to the product, or points to a location that is "malformed" (such as NULL) or larger than expected by a read or write operation, then a crash may occur.
Integrity,Confidentiality,Availability
Technical Impact: Execute Unauthorized Code or Commands
If the expired pointer is used in a function call, or points to unexpected data in a write operation, then code execution may be possible.
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