CVE-2026-30802 Overview
CVE-2026-30802 is an out-of-bounds read vulnerability [CWE-125] in the Core Libraries of RTI Connext Micro. The flaw affects versions from 4.0.0 before 4.3.0. An unauthenticated attacker can trigger the issue over the network without user interaction. Successful exploitation allows the attacker to overread buffers, which can leak adjacent memory contents and cause process termination through abnormal reads.
RTI Connext Micro is a Data Distribution Service (DDS) middleware used in robotics, autonomous systems, and industrial control. A reachable DDS endpoint in these environments makes this flaw relevant to operational technology operators.
Critical Impact
Network-reachable RTI Connext Micro deployments running versions 4.0.0 through 4.2.x can be forced into out-of-bounds memory reads, enabling information disclosure and denial of service against DDS-based systems.
Affected Products
- RTI Connext Micro Core Libraries 4.0.0 through versions prior to 4.3.0
- Systems embedding Connext Micro middleware for DDS communication
- Robotics, autonomous, and industrial deployments built on vulnerable Connext Micro releases
Discovery Timeline
- 2026-06-17 - CVE-2026-30802 published to NVD
- 2026-06-17 - Last updated in NVD database
Technical Details for CVE-2026-30802
Vulnerability Analysis
The vulnerability is classified under [CWE-125] Out-of-bounds Read. The Core Libraries of RTI Connext Micro read past the end of an allocated buffer when processing certain DDS protocol input. The condition is reachable across the network without authentication or user interaction, which expands the attack surface to any host that can deliver DDS traffic to a vulnerable participant.
The EPSS probability is 0.276% with a percentile of 19.17, indicating limited observed exploitation interest at publication. No public proof-of-concept code, exploit, or CISA KEV listing is associated with the entry.
Root Cause
The defect originates in buffer boundary handling within the Core Libraries. The affected code path consumes attacker-controlled length or offset values without sufficient validation against the actual buffer size. Reads then extend beyond the allocated region, returning adjacent process memory or causing an access violation. RTI has not published a detailed root-cause description beyond the advisory entry for CVE-2026-30802.
Attack Vector
The attack vector is network. An attacker sends crafted DDS messages to a vulnerable Connext Micro participant. Because DDS deployments often expose participants on multicast and broadcast discovery channels, any host reachable on the same network segment can deliver the malformed input. The CVSS 4.0 base score is 8.8, driven primarily by high availability impact and limited confidentiality impact.
No verified proof-of-concept code is available. Refer to the RTI Vulnerability advisory for CVE-2026-30802 for vendor-provided technical context.
Detection Methods for CVE-2026-30802
Indicators of Compromise
- Unexpected crashes, restarts, or assertion failures in processes that link the RTI Connext Micro Core Libraries.
- Anomalous DDS discovery or RTPS traffic from untrusted hosts, particularly malformed submessages or oversized length fields.
- Memory access violations logged by the host OS for binaries that embed Connext Micro.
Detection Strategies
- Inventory all systems running Connext Micro and compare installed versions against the fixed release 4.3.0.
- Inspect RTPS traffic for malformed submessage headers, invalid parameter lengths, or unexpected sources outside known participant lists.
- Correlate crash telemetry from DDS-dependent applications with concurrent inbound RTPS traffic to identify probable exploitation attempts.
Monitoring Recommendations
- Enable verbose logging in Connext Micro participants during the remediation window to capture parsing errors and abnormal terminations.
- Monitor network segments hosting DDS participants for new or unauthorized peers initiating discovery.
- Forward host-level crash and EDR telemetry from robotics and OT endpoints to a central analytics pipeline for correlation with DDS traffic events.
How to Mitigate CVE-2026-30802
Immediate Actions Required
- Upgrade RTI Connext Micro to version 4.3.0 or later on all affected systems.
- Restrict DDS network reachability to authenticated, trusted participants using network segmentation and ACLs.
- Audit the software bill of materials of robotics and embedded products for transitive use of Connext Micro 4.0.0 through 4.2.x.
Patch Information
RTI has resolved the issue in RTI Connext Micro 4.3.0. Refer to the vendor advisory at RTI Vulnerability CVE-2026-30802 for release notes and download instructions. Embedded product vendors that ship Connext Micro must rebuild and redistribute updated firmware to downstream operators.
Workarounds
- Block inbound RTPS traffic from untrusted hosts at the network boundary until participants can be upgraded.
- Disable or limit DDS multicast discovery on segments shared with untrusted devices.
- Apply host-based firewalls to allow DDS ports only between known participants where upgrade timing requires staged rollout.
# Example: restrict RTPS/DDS discovery ports to trusted participants (iptables)
iptables -A INPUT -p udp --dport 7400:7500 -s 10.10.20.0/24 -j ACCEPT
iptables -A INPUT -p udp --dport 7400:7500 -j DROP
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
