Vulnerability · Published Sep 22, 2026 · Assigned by RTI
CVE-2026-7866Stack-based Buffer Overflow vulnerability in RTI Connext Professional (Core Libraries) allows Overflow Buffers.
Critical 10.0
In plain English
A critical-severity stack buffer overflow 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 0.3% (higher than 24% of all known vulnerabilities).
Severity (CVSS 4.0)10.0Critical
Exploit odds (30 days)0.3%top 75.9% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
Stack-based Buffer Overflow vulnerability in RTI Connext Professional (Core Libraries) allows Overflow Buffers. 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 4.3x 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.*4.3x – before 5.1.* |
Weakness: CWE-121 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H