Vulnerability · Published Sep 22, 2026 · Assigned by RTI
CVE-2026-18459Incorrect Calculation vulnerability in RTI Connext Professional (Core Libraries) allows Abuse Existing Functionality.
High 8.7
In plain English
A high-severity security flaw in Connext Professional from RTI. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 37% of all known vulnerabilities).
Severity (CVSS 4.0)8.7High
Exploit odds (30 days)0.4%top 62.8% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
Incorrect Calculation vulnerability in RTI Connext Professional (Core Libraries) allows Abuse Existing Functionality. This issue affects Connext Professional: from 7.4.0 before 7.7.0.1, from 7.0.0 before 7.3.1.6, from 6.1.0 before 6.1.*, from 6.0.0 before 6.0.*, from 5.3.0 before 5.3.*, from 5.2.0 before 5.2.*, from 4.1x before 5.1.*.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| RTI | Connext Professional | 7.4.0 – before 7.7.0.17.0.0 – before 7.3.1.66.1.0 – before 6.1.*6.0.0 – before 6.0.*5.3.0 – before 5.3.*5.2.0 – before 5.2.*4.1x – before 5.1.* |
Weakness: CWE-682 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N