CVE-2026-2394: RTI Connext Buffer Over-read Vulnerability

CVE-2026-2394 Overview

A Buffer Over-read vulnerability has been identified in RTI Connext Professional Core Libraries that allows attackers to overread buffers. This vulnerability (CWE-126) enables network-based attackers to read beyond the intended buffer boundaries, potentially exposing sensitive data or causing service disruption in affected systems.

RTI Connext Professional is a connectivity software framework widely used in industrial, defense, and critical infrastructure environments for real-time data distribution. The vulnerability affects multiple major versions of the platform, spanning from legacy 4.3x releases through the current 7.4.0 branch.

Critical Impact

Network-accessible buffer over-read vulnerability in critical infrastructure communication software may expose sensitive data or cause service disruption in industrial control systems.

Affected Products

• RTI Connext Professional versions 7.4.0 to before 7.7.0
• RTI Connext Professional versions 7.0.0 to before 7.3.1.1
• RTI Connext Professional versions 6.1.0 and later 6.1.* releases
• RTI Connext Professional versions 6.0.0 and later 6.0.* releases
• RTI Connext Professional versions 5.3.0 and later 5.3.* releases
• RTI Connext Professional versions 4.3x to before 5.2.*

Discovery Timeline

• 2026-04-01 - CVE-2026-2394 published to NVD
• 2026-04-01 - Last updated in NVD database

Technical Details for CVE-2026-2394

Vulnerability Analysis

This vulnerability is classified as a Buffer Over-read (CWE-126), a memory safety issue where an application reads data beyond the boundaries of an allocated buffer. In the context of RTI Connext Professional Core Libraries, this flaw can be exploited over a network without requiring authentication or user interaction.

The buffer over-read condition occurs within the core communication libraries of RTI Connext Professional. When processing certain network packets or data structures, the software fails to properly validate buffer boundaries before performing read operations. This allows an attacker to cause the application to read memory contents beyond the intended buffer limits.

The practical impact of this vulnerability is twofold: first, it can lead to information disclosure by exposing memory contents that may contain sensitive configuration data, cryptographic materials, or other application state; second, attempting to read invalid memory regions may trigger application crashes, resulting in denial of service conditions.

Root Cause

The root cause of CVE-2026-2394 is improper boundary checking in the Core Libraries of RTI Connext Professional. The vulnerable code paths fail to adequately validate the size of input data against allocated buffer sizes before performing read operations. This represents a classic memory safety vulnerability where length validation is either missing or insufficient before memory access occurs.

Attack Vector

The vulnerability is exploitable over a network without requiring prior authentication or any user interaction. An attacker with network access to an affected RTI Connext Professional deployment can craft malicious packets that trigger the buffer over-read condition.

The attack scenario involves sending specially crafted network messages to the Connext Professional service, causing the Core Libraries to read beyond allocated buffer boundaries. Depending on the memory layout and the data exposed, this could result in:

• Information leakage of process memory contents
• Service interruption due to access violations
• Potential exposure of cryptographic keys or session data

For detailed technical information, refer to the RTI Security Vulnerability Advisory.

Detection Methods for CVE-2026-2394

Indicators of Compromise

• Unexpected crashes or restarts of RTI Connext Professional services without administrative action
• Anomalous network traffic patterns targeting RTI Connext communication ports
• Error logs indicating memory access violations or segmentation faults in Core Libraries
• Unusual reconnaissance activity targeting DDS (Data Distribution Service) endpoints

Detection Strategies

• Deploy network intrusion detection systems (IDS) with signatures for malformed DDS/RTPS protocol packets
• Implement application-level monitoring to detect abnormal memory consumption or access patterns
• Enable verbose logging in RTI Connext Professional to capture detailed error conditions
• Monitor for repeated connection attempts from unknown sources to Connext endpoints

Monitoring Recommendations

• Establish baselines for normal RTI Connext Professional service behavior and alert on deviations
• Configure centralized log aggregation for all Connext Professional instances
• Implement network segmentation monitoring to detect unauthorized access attempts to industrial control network segments
• Deploy endpoint detection and response (EDR) solutions on hosts running Connext Professional

How to Mitigate CVE-2026-2394

Immediate Actions Required

• Inventory all RTI Connext Professional deployments and identify instances running affected versions
• Apply network segmentation to restrict access to Connext Professional services from untrusted networks
• Review firewall rules to limit exposure of DDS/RTPS communication ports
• Enable enhanced logging and monitoring on affected systems until patches can be applied

Patch Information

RTI has published security guidance for this vulnerability. Organizations should consult the RTI Security Advisory for CVE-2026-2394 for official patch information and upgrade guidance.

The following versions address this vulnerability:

• Upgrade to Connext Professional 7.7.0 or later for the 7.4.x branch
• Upgrade to Connext Professional 7.3.1.1 or later for the 7.0.x-7.3.x branch
• Contact RTI for upgrade paths for legacy versions (6.1.x, 6.0.x, 5.3.x, 4.3x-5.2.x)

Workarounds

• Implement strict network access controls to limit connectivity to RTI Connext Professional services to trusted hosts only
• Deploy network-level filtering to inspect and validate DDS/RTPS protocol traffic
• Consider deploying application firewalls or proxies capable of protocol-aware filtering for DDS communications
• Isolate affected systems on dedicated network segments with enhanced monitoring until patching is completed

# Example: Restrict network access to RTI Connext ports using iptables
# Adjust port numbers based on your Connext Professional configuration

# Allow trusted network segment (example: 10.0.1.0/24)
iptables -A INPUT -p udp --dport 7400:7500 -s 10.0.1.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 7400:7500 -s 10.0.1.0/24 -j ACCEPT

# Drop all other traffic to Connext ports
iptables -A INPUT -p udp --dport 7400:7500 -j DROP
iptables -A INPUT -p tcp --dport 7400:7500 -j DROP