CVE-2026-18459 in Connext Professional
Summary
by MITRE • 09/22/2026
Incorrect Calculation vulnerability in RTI Connext Professional (Core Libraries) allows Abuse Existing Functionality. This issue affects Connext Professional: from 7.4.0 before 7.7.0.1, from 7.0.0 before 7.3.1.6, from 6.1.0 before 6.1.*, from 6.0.0 before 6.0.*, from 5.3.0 before 5.3.*, from 5.2.0 before 5.2.*, from 4.1x before 5.1.*.
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Analysis
by VulDB Data Team • 09/22/2026
The vulnerability identified in RTI Connext Professional Core Libraries represents a critical flaw rooted in incorrect calculation logic within the middleware's core processing functions. This issue falls under the category of Abuse Existing Functionality, which is closely aligned with CWE-697: Incorrect Calculation. In enterprise environments where real-time data distribution and communication are paramount, such as industrial control systems, financial trading platforms, or autonomous vehicle networks, RTI Connext serves as a foundational component for reliable message passing between distributed processes. The flaw arises when the software fails to properly validate or compute parameters during specific operations, leading to unintended behavior that can be exploited by an attacker who has legitimate access to the system but seeks to escalate privileges or disrupt service availability through misuse of existing features rather than exploiting a traditional buffer overflow or injection vector.
The technical nature of this vulnerability involves miscalculations in how Connext handles internal state transitions or resource allocation during data exchange operations. When specific sequences of messages are processed, particularly those involving complex QoS (Quality of Service) settings or large payloads, the incorrect calculation can lead to memory corruption, denial of service conditions, or unexpected termination of critical services. Because this is classified as an abuse of existing functionality, it implies that the vulnerability does not require bypassing authentication mechanisms directly but rather leverages authorized interactions with the middleware in a way that triggers the flawed logic. This makes detection more challenging for standard intrusion prevention systems that focus on external attack vectors or unauthorized access attempts, as the traffic appears legitimate from a network perspective until the internal processing error occurs.
The operational impact of this vulnerability is significant due to the widespread adoption of RTI Connext in safety-critical and high-performance applications. Affected versions span multiple major releases, including 7.4.x prior to 7.7.0.1, 7.0.x prior to 7.3.1.6, as well as legacy branches such as 6.1., 6.0., 5.3., 5.2., and 4.1x prior to 5.1.*. For organizations running these versions, the risk extends beyond simple service disruption; it potentially allows for remote code execution or privilege escalation if the miscalculation leads to memory corruption that can be controlled by an attacker. In real-time systems, even a brief interruption caused by this flaw can lead to catastrophic failures in control loops or data integrity issues that compromise decision-making processes. The broad range of affected versions indicates that the underlying architectural logic has been consistent across these releases, posing a systemic risk to any infrastructure relying on older or unpatched middleware components.
Mitigation strategies must prioritize immediate patching for all systems running vulnerable versions of RTI Connext Professional. Organizations should audit their environments to identify instances of the specified version ranges and apply the corresponding updates provided by RTI Networking Inc., specifically targeting 7.7.0.1, 7.3.1.6, or later stable releases in respective branches where available. In cases where immediate patching is not feasible due to operational constraints, network segmentation should be implemented to restrict access to Connext-enabled services from untrusted networks. Additionally, implementing strict input validation at the application layer that consumes data from RTI can help mitigate some risks by ensuring that malformed or excessively large payloads are rejected before they reach the vulnerable middleware components. Monitoring for unusual spikes in message volume or specific QoS parameter combinations may also aid in detecting potential exploitation attempts of this abuse-of-functionality flaw.