CVE-2026-18458 in Connext Professional
Summary
by MITRE • 09/22/2026
Out-of-bounds Read, Function Call With Incorrect Number of Arguments, Access of Resource Using Incompatible Type ('Type Confusion') vulnerability in RTI Connext Professional (Core Libraries) allows Overread Buffers. This issue affects Connext Professional: from 7.4.0 before 7.7.0.1, from 7.3.0 before 7.3.1.6, from 6.1.2.21 before 6.1.*.
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Analysis
by VulDB Data Team • 09/22/2026
The vulnerability identified in RTI Connext Professional Core Libraries represents a critical class of memory safety issues that compromise the integrity and confidentiality of data processing within distributed real-time systems. Specifically, this flaw encompasses an out-of-bounds read condition often referred to as overread buffers, which occurs when software reads data beyond the intended boundaries of allocated memory regions. This type of error is frequently accompanied by a function call with an incorrect number of arguments and access of resources using incompatible types, commonly known as type confusion. These defects indicate fundamental failures in input validation and memory management logic within the middleware's core processing routines, allowing attackers to exploit malformed or specially crafted data inputs to trigger unintended behavior during message deserialization or handling operations.
From a technical perspective, the out-of-bounds read vulnerability allows an attacker to access sensitive information stored in adjacent memory locations that were not intended for public consumption. When the application processes maliciously constructed messages, it may fail to verify the length of incoming data against the allocated buffer size, leading to reads from unauthorized memory addresses. This can result in the leakage of internal state variables, cryptographic keys, or other confidential system information into the output stream or error logs. Concurrently, the presence of function calls with incorrect argument counts suggests a breakdown in type safety and parameter validation mechanisms. If arguments are passed incorrectly, particularly when combined with type confusion where an object is treated as a different data type than originally intended, it can lead to unpredictable execution paths, potential crashes due to segmentation faults, or further exploitation vectors that leverage the misinterpreted memory layout for arbitrary code execution scenarios.
The operational impact of these vulnerabilities is severe given the critical nature of RTI Connext Professional in industrial control systems, financial trading platforms, and aerospace applications where low-latency and high-reliability communication are paramount. An attacker who can exploit this vulnerability does not necessarily need to execute remote code immediately; even a simple denial-of-service condition caused by application crashes can disrupt mission-critical operations. More dangerously, the ability to perform over-reads provides an information disclosure vector that can aid in subsequent exploitation attempts by revealing memory layouts or sensitive data structures. This undermines the security posture of environments relying on Connext for secure inter-process communication and exposes organizations to risks defined under CWE-125 Out-of-bounds Read and CWE-843 Access of Resource Using Incompatible Type, which are frequently associated with advanced persistent threats seeking to establish footholds in hardened networks through memory corruption techniques.
Mitigation strategies must prioritize immediate patching as the primary defense mechanism. Organizations running affected versions of RTI Connext Professional should upgrade to version 7.7.0.1 or later for the 7.x branch, version 7.3.1.6 or later for the 7.3.x branch, and appropriate fixed releases within the 6.1.* series starting from a point after 6.1.2.21. In environments where immediate patching is not feasible due to operational constraints, network segmentation should be enforced to restrict access to Connext-enabled services only from trusted hosts with verified identities. Additionally, implementing strict input validation at perimeter security devices and deploying intrusion detection systems capable of identifying anomalous message patterns associated with buffer overflow or type confusion attacks can provide a layer of defense-in-depth. Regular auditing of middleware configurations and adherence to secure coding standards such as those outlined in the OWASP Secure Coding Practices will further reduce the likelihood of similar vulnerabilities arising from custom integrations or extensions built upon the Connext framework.