CVE-2026-18462: RTI Connext Professional Privilege Escalation

CVE-2026-18462 Overview

CVE-2026-18462 is an integer overflow and improper access control vulnerability in RTI Connext Professional Core Libraries. The flaw enables shared resource manipulation on affected systems through local access. It is classified under [CWE-190] (Integer Overflow or Wraparound) and impacts multiple release branches of the Connext Professional middleware used in distributed real-time systems.

Affected versions include Connext Professional 7.4.0 before 7.7.0.1, 7.0.0 before 7.3.1.6, and the 6.1.x branch. An authenticated local attacker with low privileges can exploit the condition to compromise confidentiality, integrity, and availability of the Connext process and shared resources it manages.

Critical Impact
Successful exploitation allows a local attacker to manipulate shared resources managed by Connext Professional, resulting in impact to confidentiality, integrity, and availability of the affected middleware and dependent applications.

Affected Products

RTI Connext Professional 7.4.0 before 7.7.0.1
RTI Connext Professional 7.0.0 before 7.3.1.6
RTI Connext Professional 6.1.x branch

Discovery Timeline

2026-09-22 - CVE-2026-18462 published to NVD
2026-09-22 - Last updated in NVD database

Technical Details for CVE-2026-18462

Vulnerability Analysis

The vulnerability resides in the Core Libraries of RTI Connext Professional, a Data Distribution Service (DDS) middleware used in industrial, aerospace, defense, and autonomous systems. The flaw combines an integer overflow condition with improper access control on shared resources.

When affected code paths compute size or index values based on attacker-influenced inputs, the arithmetic wraps around and yields values inconsistent with actual buffer or resource bounds. The subsequent access to shared resources proceeds without adequate validation, enabling manipulation of memory or state that other participants rely on.

Because DDS middleware brokers data between publishers and subscribers, corruption of shared structures can propagate to dependent applications. Exploitation requires local access and low privileges, but no user interaction.

Root Cause

The underlying defect is an integer overflow ([CWE-190]) in Core Library routines that manage shared resource allocation or indexing. Overflowed values bypass length checks and reach code that reads or writes shared memory. Improper access control on those shared resources compounds the issue by permitting a low-privileged local process to influence data used by other Connext participants.

Attack Vector

A local attacker with an authenticated low-privilege account on a host running Connext Professional supplies crafted values to affected APIs or shared-memory transport paths. High attack complexity indicates the attacker must satisfy specific timing or state conditions to trigger the overflow reliably. Once triggered, the attacker manipulates shared resources to affect confidentiality, integrity, and availability of the Connext process.

No verified public exploit code is available. Technical specifics are described in the RTI Vulnerability Advisory CVE-2026-18462.

Detection Methods for CVE-2026-18462

Indicators of Compromise

Unexpected crashes, segmentation faults, or restarts of Connext Professional participant processes on hosts with local user activity.
Anomalous access to DDS shared-memory segments (for example, /dev/shm entries created by Connext) by processes outside the expected DDS application set.
Inconsistencies in published DDS topic data that do not match sender application logs.

Detection Strategies

Inventory hosts running RTI Connext Professional and compare installed versions against the fixed releases 7.7.0.1 and 7.3.1.6.
Monitor process behavior of Connext participants for abnormal memory allocation patterns, repeated exceptions, or unexpected child processes.
Correlate local logon events with subsequent Connext process anomalies to identify potential local exploitation attempts.

Monitoring Recommendations

Enable verbose Connext logging in non-production environments to capture allocation failures and boundary check anomalies.
Collect endpoint telemetry (process, file, and shared-memory activity) into a centralized data lake for retrospective analysis.
Alert on non-Connext processes opening or mapping DDS shared-memory objects owned by Connext service accounts.

How to Mitigate CVE-2026-18462

Immediate Actions Required

Upgrade RTI Connext Professional to version 7.7.0.1 (for the 7.4.x branch) or 7.3.1.6 (for the 7.0.x–7.3.x branch) as soon as testing permits.
For deployments on the 6.1.x branch, consult RTI support for the appropriate fixed release or migration path.
Restrict local interactive and service accounts on hosts running Connext to the minimum set required for operations.

Patch Information

RTI has released fixed versions addressing CVE-2026-18462. Upgrade to Connext Professional 7.7.0.1 or 7.3.1.6 depending on the deployed branch. Refer to the RTI Vulnerability Advisory CVE-2026-18462 for release notes and download instructions.

Workarounds

Limit local login access on systems hosting Connext participants to trusted administrators only.
Apply operating system access controls to DDS shared-memory segments so that only the Connext service account can read or write them.
Segment DDS domains and hosts so that untrusted workloads do not share operating system instances with Connext participants.

bash

# Verify installed RTI Connext Professional version and restrict shared-memory access
rtiddsping -version
ls -l /dev/shm | grep -i rti
chmod 600 /dev/shm/RTIOsapiSharedMemory*