CVE-2026-4374: Rti Connext Professional

Critical severity, CVSS 9.1. EPSS: 0.4% chance of exploitation in the next 30 days.

Improper Restriction of XML External Entity Reference vulnerability in RTI Connext Professional (Recording Service,Routing Service,Queueing Service,Cloud Discovery Service,Observability Collector) allows Serialized Data External Linking, Data Serialization External Entities Blowup. This issue affects Connext Professional: from 7.4.0 before 7.7.0, from 7.0.0 before 7.3.1.1, from 6.1.0 before 6.1.2.34, from 6.0.0 before 6.0.*, from 5.3.0 before 5.3.*.

Affected products

• Rti Connext Professional: from 5.3.0, up to and including 5.3.1.45; from 6.0.0, up to and including 6.0.1.40; from 6.1.0, up to and including 6.1.2.27; from 7.0.0, before 7.3.1.1 (fixed in 7.3.1.1); from 7.4.0, before 7.7.0 (fixed in 7.7.0)

Published 2026-04-01. Last modified 2026-09-22.