CVE-2026-18462 is an integer overflow or wraparound vulnerability combined with improper access control (CWE-190 and CWE-284) in RTI Connext Professional Core Libraries. This vulnerability allows an attacker with limited privileges and local access to manipulate shared resources, potentially leading to unauthorized actions or corruption of data. The affected versions are 6.1.0, versions from 7.0.0 up to but excluding 7.3.1.6, and versions from 7.4.0 up to but excluding 7.7.0.1. The CVSS 4.0 vector indicates a local attack vector with high attack complexity and no user interaction required. The vendor has not provided explicit patch or remediation information in the supplied data, and no known exploits are currently reported in the wild.

The vulnerability allows local attackers with limited privileges to manipulate shared resources due to integer overflow or wraparound and improper access control. This can lead to unauthorized resource manipulation, potentially affecting system integrity and stability. The high CVSS score reflects significant impact potential if exploited, although exploitation requires local access and has high complexity.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Since no vendor patch or official fix information is provided, users should monitor RTI's official channels for updates. In the meantime, restrict local access to trusted users and systems to reduce risk.