CVE-2026-18460 in Connext Professional
Summary
by MITRE • 09/22/2026
Off-by-one Error, Out-of-bounds Write vulnerability in RTI Connext Professional (Core Libraries) allows Overflow Buffers. This issue affects Connext Professional: from 7.4.0 before 7.7.0.1, from 7.0.0 before 7.3.1.6.
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Analysis
by VulDB Data Team • 09/22/2026
The vulnerability identified in RTI Connext Professional Core Libraries represents a critical memory safety flaw classified as an off-by-one error leading to an out-of-bounds write condition. This specific type of defect occurs when a loop or buffer operation iterates one position beyond the allocated boundaries of a data structure, resulting in the writing of data into adjacent memory locations that are not intended for such operations. In the context of RTI Connext Professional, which serves as a high-performance middleware solution for real-time distributed systems, this flaw resides within the core libraries responsible for handling message serialization and deserialization processes. The affected versions include releases from 7.4.0 up to but not including version 7.7.0.1, as well as earlier iterations starting from 7.0.0 up to but excluding version 7.3.1.6. These components are fundamental to the communication infrastructure of industrial control systems and other latency-sensitive applications that rely on reliable data exchange mechanisms.
From a technical perspective, an out-of-bounds write vulnerability allows an attacker or malicious input source to corrupt memory structures adjacent to the target buffer. This corruption can overwrite critical metadata such as function pointers, object headers, or security tokens stored in nearby memory regions. The immediate consequence of this memory manipulation is often a denial of service due to application crashes caused by invalid memory access attempts when the corrupted data is subsequently accessed. However, the severity escalates significantly if an attacker can precisely control the offset and content of the write operation. By carefully crafting input that triggers the off-by-one condition with specific byte values, it may be possible to achieve arbitrary code execution on the affected system. This transforms a simple memory corruption bug into a potential remote code execution vector, particularly in scenarios where Connext Professional processes untrusted or poorly validated network traffic from connected devices or other middleware nodes.
The operational impact of this vulnerability is profound given the deployment context of RTI Connext Professional. It is widely utilized in sectors such as automotive manufacturing, aerospace, energy production, and defense systems, where real-time data integrity and system availability are paramount. A successful exploitation could lead to the compromise of critical infrastructure components, allowing adversaries to disrupt operations, steal sensitive telemetry data, or inject malicious commands into control loops. The presence of this flaw undermines the reliability guarantees that Connext Professional is designed to provide, potentially causing cascading failures in distributed architectures where multiple nodes depend on consistent state synchronization. Furthermore, because these systems often operate with elevated privileges to ensure low-latency performance, any compromise can lead to broader system-level access beyond the scope of the middleware itself.
Mitigation strategies must prioritize immediate patching and rigorous input validation practices. Organizations running affected versions should upgrade RTI Connext Professional to a patched release outside the specified vulnerable ranges as soon as possible. In environments where immediate upgrading is not feasible, network segmentation policies should be enforced to restrict access to Connext-enabled services from untrusted networks or hosts. Additionally, implementing strict data validation at system boundaries can help detect malformed messages that might trigger the off-by-one condition before they reach the core libraries. Security monitoring solutions should also be configured to alert on anomalous memory usage patterns or unexpected process terminations associated with middleware components.
This vulnerability aligns with Common Weakness Enumeration identifier CWE-193, which describes an off-by-one error leading to a buffer overflow, and is closely related to CWE-787, which covers out-of-bounds write vulnerabilities that can lead to memory corruption. In terms of the MITRE ATT&CK framework, this flaw facilitates techniques associated with Initial Access via Exploitation of Remote Services if exploited over a network, or Privilege Escalation through Memory Corruption if local access is gained first. The ability to manipulate heap structures places it within the realm of exploitation patterns that target memory safety violations, emphasizing the need for developers and operators to adopt secure coding standards such as MISRA C or CERT C guidelines during future development cycles to prevent similar defects from being introduced into critical infrastructure software.