CVE-2026-8849: RTI Connext Professional Use After Free Flaw

CVE-2026-8849 Overview

CVE-2026-8849 is a Use After Free vulnerability [CWE-416] in the Security Plugins component of RTI Connext Professional. The flaw affects Connext Professional versions from 7.6.0 before 7.7.0.1. An authenticated attacker with low privileges can exploit the vulnerability over the network to manipulate files on affected systems. RTI Connext Professional is a Data Distribution Service (DDS) framework used in mission-critical distributed systems, including autonomous vehicles, industrial automation, and defense platforms. Successful exploitation impacts confidentiality, integrity, and availability of the vulnerable component.

Critical Impact
Network-accessible use-after-free allows an authenticated attacker to manipulate files and potentially compromise the integrity of DDS-based distributed systems relying on the Security Plugins.

Affected Products

RTI Connext Professional 7.6.0
RTI Connext Professional versions after 7.6.0 and before 7.7.0.1
RTI Connext Professional Security Plugins component

Discovery Timeline

2026-09-22 - CVE-2026-8849 published to NVD
2026-09-23 - Last updated in NVD database

Technical Details for CVE-2026-8849

Vulnerability Analysis

The vulnerability is a use-after-free condition [CWE-416] within the RTI Connext Professional Security Plugins. Use-after-free defects occur when a program continues to reference memory after it has been released. Subsequent operations against the dangling pointer produce undefined behavior, including data corruption and control-flow hijacking. In this case, the flawed memory handling in the Security Plugins path enables file manipulation on the target system. The impact spans confidentiality, integrity, and availability of the affected process, and the attack requires only low privileges combined with network access to a vulnerable endpoint.

Root Cause

The root cause is improper lifecycle management of a heap object inside the Security Plugins module. After the object is freed, code paths continue to dereference the released pointer. When an attacker influences the reallocation of that memory region, they can steer subsequent operations that would normally act on the freed structure. In this vulnerability, that hijacked control leads to unintended file operations on the host.

Attack Vector

Exploitation requires network reachability to a Connext Professional participant that uses the Security Plugins, along with low-privileged authentication. The attacker triggers the free of a security-relevant object and then re-references it through a subsequent operation. Because the Security Plugins are invoked during DDS discovery and secure data exchange, the vulnerable code path is reachable through normal DDS traffic patterns. See the RTI Vulnerability Advisory for CVE-2026-8849 for vendor-specific details.

No verified proof-of-concept code is publicly available. The vulnerability mechanism is described in prose only; refer to the vendor advisory for technical specifics.

Detection Methods for CVE-2026-8849

Indicators of Compromise

Unexpected file creation, modification, or deletion in directories accessed by Connext Professional processes
Abnormal termination or crash reports from DDS participant processes using Security Plugins
Unusual authenticated DDS sessions from unexpected network sources targeting secure domains

Detection Strategies

Inventory all deployments of RTI Connext Professional and confirm which participants load the Security Plugins
Enable verbose logging in Connext Security Plugins to capture authentication events, permission checks, and abnormal object lifecycles
Compare running Connext versions against the fixed release 7.7.0.1 using software composition tools

Monitoring Recommendations

Monitor file integrity on directories writable by Connext participant processes
Alert on unexpected process crashes, restarts, or memory faults in DDS applications
Capture and review DDS discovery and authentication traffic for anomalous participant behavior

How to Mitigate CVE-2026-8849

Immediate Actions Required

Upgrade RTI Connext Professional to version 7.7.0.1 or later on all affected participants
Restrict network reachability to DDS endpoints that use the Security Plugins to trusted segments only
Rotate any DDS credentials or permissions files that may have been exposed to untrusted participants
Review file integrity on hosts running vulnerable Connext participants for signs of manipulation

Patch Information

RTI has addressed CVE-2026-8849 in Connext Professional 7.7.0.1. All deployments running versions from 7.6.0 up to but not including 7.7.0.1 should be upgraded. Consult the RTI Vulnerability Advisory for CVE-2026-8849 for supported upgrade paths and release notes.

Workarounds

Where immediate patching is not possible, isolate vulnerable participants on dedicated network segments with strict access controls
Enforce least-privilege permissions in DDS governance and permissions files to reduce the set of authenticated actors that can reach the vulnerable code path
Disable non-essential Connext participants that load the Security Plugins until the patch is applied

bash

# Verify installed RTI Connext Professional version and plan upgrade to 7.7.0.1
rtiddsping -version