CVE-2026-18462 in Connext Professional
Summary
by MITRE • 09/22/2026
Integer Overflow or Wraparound, Improper Access Control vulnerability in RTI Connext Professional (Core Libraries) allows Shared Resource Manipulation. 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.*.
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Analysis
by VulDB Data Team • 09/22/2026
The vulnerability identified in RTI Connext Professional Core Libraries represents a critical intersection of memory safety failures and access control deficiencies that collectively enable unauthorized manipulation of shared resources. This issue specifically impacts versions ranging from 7.4.0 up to, but not including, version 7.7.0.1, as well as earlier major releases such as the 7.0.x series prior to patch level 7.3.1.6 and the legacy 6.1.* branch before its final secure updates. RTI Connext is a widely deployed middleware solution for real-time data distribution in high-performance distributed systems, often utilized in sectors where reliability and security are paramount, including aerospace, defense, industrial automation, and financial trading platforms. The presence of this vulnerability within the core libraries suggests that it resides at a fundamental layer of the communication stack, potentially affecting any application built upon or integrated with these specific versions of the middleware.
At its technical core, the flaw is characterized by an integer overflow or wraparound condition coupled with improper access control mechanisms. Integer overflows occur when an arithmetic operation results in a value that exceeds the maximum capacity of the allocated data type, causing it to wrap around to a minimum value rather than throwing an exception or handling the error gracefully. In the context of memory management and buffer allocation within Connext Core Libraries, such miscalculations can lead to the allocation of significantly smaller buffers than intended by the application logic. When combined with improper access control, this discrepancy allows attackers who have gained limited initial access or are interacting with specific endpoints to manipulate shared resources in ways that bypass expected security boundaries. The lack of rigorous validation on input parameters related to size calculations creates a pathway for malicious actors to exploit these memory discrepancies, potentially leading to buffer overflows, heap corruption, or the unauthorized modification of critical data structures maintained by the middleware.
The operational impact of this vulnerability is severe due to its potential to facilitate shared resource manipulation. In distributed systems relying on RTI Connext, multiple processes and nodes share resources such as topic data, participant states, and communication channels. An attacker exploiting this flaw could potentially disrupt service availability by causing crashes or memory corruption within the middleware process. More critically, the ability to manipulate shared resources implies that an adversary might be able to inject malicious payloads into legitimate data streams, alter message contents without detection, or gain unauthorized access to sensitive information being transmitted between nodes. This undermines the integrity and confidentiality guarantees provided by the secure configuration of Connext DDS. In high-assurance environments, such as those governed by standards like DO-178C for aviation or IEC 62443 for industrial security, this type of vulnerability poses a significant risk to system safety and operational continuity, potentially leading to catastrophic failures if exploited in critical control loops.
From a classification perspective, this issue aligns with CWE-190 (Integer Overflow or Wraparound) as the primary technical cause and CWE-269 (Improper Privilege Escalation) or CWE-732 (Incorrect Permission Assignment for Critical Resource) regarding the access control failure. The exploitation pattern likely corresponds to MITRE ATT&CK techniques involving resource hijacking, such as T1498 Network Denial of Service if the overflow leads to system instability, or potentially T1059 Command and Control if used to establish persistent backdoors through memory corruption. Understanding these mappings is essential for security teams aiming to detect similar patterns in other components or future updates. The vulnerability highlights the importance of rigorous static analysis and fuzzing during the development lifecycle, particularly for libraries that handle untrusted network inputs and manage complex state machines across distributed nodes.
Mitigation strategies must prioritize immediate patching by upgrading RTI Connext Professional to a version outside the affected ranges, specifically targeting 7.7.0.1 or later for the newer branch, 7.3.1.6 or later for the 7.0.x series, and ensuring that any legacy systems running on the 6.1.* line are updated to their final secure release. In scenarios where immediate patching is not feasible due to operational constraints, organizations should implement network segmentation to restrict access to Connext-enabled endpoints from untrusted networks. Additionally, deploying intrusion detection systems configured to monitor for anomalous traffic patterns indicative of buffer overflow attempts or unauthorized resource manipulation can provide a layer of defense in depth. It is also advisable to review application-level security controls to ensure that data validation and integrity checks are robust enough to detect corrupted messages resulting from such exploits. Regular vulnerability assessments and penetration testing focused on middleware components will help identify similar weaknesses before they can be leveraged by adversaries, ensuring the continued resilience of distributed systems against evolving cyber threats.