CVE-2026-7866 in Connext Professional
Summary
by MITRE • 09/22/2026
Stack-based Buffer Overflow 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, 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 4.3x before 5.1.*.
If you want to get best quality of vulnerability data, you may have to visit VulDB.
Analysis
by VulDB Data Team • 09/22/2026
The identified vulnerability represents a critical stack-based buffer overflow within the core libraries of RTI Connext Professional, specifically affecting versions ranging from early iterations such as 4.3.x and 5.2.0 up to but not including version 7.7.0.1 across multiple major release branches. This class of flaw is fundamentally rooted in improper memory management practices where a program writes more data to a buffer than it can hold, causing the overflowed data to overwrite adjacent memory locations on the call stack. In the context of RTI Connext Professional, which serves as middleware for real-time distributed systems and high-performance communication architectures, such an error typically occurs during the processing of network packets or serialized data structures where input validation is insufficient. The attacker can exploit this condition by crafting a malicious payload that exceeds the expected buffer size, thereby gaining control over critical stack variables including return addresses and frame pointers.
From a technical perspective, this vulnerability aligns with Common Weakness Enumeration identifier CWE-121, which describes a stack-based buffer overflow resulting from copying user-controlled input into a fixed-size stack buffer without adequate bounds checking. The operational impact of such an exploit is severe, as successful exploitation allows for arbitrary code execution on the affected host system. An adversary could leverage this to bypass security mechanisms, escalate privileges, or establish persistent access within the network infrastructure that relies on RTI Connext Professional for data exchange. Given the real-time nature of many systems utilizing this middleware, such an exploit could also lead to denial-of-service conditions by crashing critical processes, thereby disrupting time-sensitive operations in industrial control systems, financial trading platforms, or aerospace applications where reliability is paramount.
The affected version range indicates that this flaw has persisted across several major releases, suggesting a systemic issue within the core library's handling of specific data types or message formats rather than an isolated incident in a single feature set. Versions from 4.3.x through 5.1., 5.2.0 before 5.3., 6.0.0 before 6.0., and 6.1.0 before 6.1. are all susceptible, as are the more recent 7.0.0 to 7.3.1.6 and 7.4.0 to 7.7.0.1 ranges. This widespread impact underscores the importance of comprehensive patch management strategies for organizations deploying RTI Connext Professional in production environments. The lack of immediate mitigation at the application layer due to the depth within the core libraries necessitates reliance on vendor-provided updates or external security controls such as network segmentation and intrusion detection systems that can identify anomalous packet sizes indicative of buffer overflow attempts.
To mitigate this risk, organizations must prioritize upgrading RTI Connext Professional to version 7.7.0.1 or later, which contains the necessary fixes for these memory safety issues. In environments where immediate patching is not feasible due to operational constraints, implementing strict input validation at application boundaries and deploying network-level protections can provide partial defense-in-depth measures. Security teams should also monitor for indicators of compromise associated with exploitation attempts, such as unusual process behavior or memory access violations in logs related to the Connext services. This vulnerability maps to MITRE ATT&CK techniques involving initial code execution via buffer overflow exploits, highlighting the need for robust endpoint detection and response capabilities that can identify abnormal stack activity indicative of successful exploitation efforts.