Is CVE-2026-4374 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-4374 being exploited in the wild.

How severe is CVE-2026-4374?

Critical severity, with a CVSS score of 9.1, published 1 April 2026.

Which products and versions are affected?

Rti Cloud Discovery Service 7.4.0 before 7.7.0, 7.1.0 before 7.3.1.1, 6.1.0 before 6.1.2.34, 6.0.0 before 6.0.*, 5.3.0 before 5.3.*; Rti Observability Collector 7.4.0 before 7.7.0, 7.1.0 before 7.3.1.1, 6.1.0 before 6.1.2.34, 6.0.0 before 6.0.*, 5.3.0 before 5.3.*; Rti Queueing Service 7.4.0 before 7.7.0, 7.1.0 before 7.3.1.1, 6.1.0 before 6.1.2.34, 6.0.0 before 6.0.*, 5.3.0 before 5.3.*; Rti Recording Service 7.4.0 before 7.7.0, 7.1.0 before 7.3.1.1, 6.1.0 before 6.1.2.34, 6.0.0 before 6.0.*, 5.3.0 before 5.3.*; and 1 more.

Is there a fix for CVE-2026-4374?

No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

How is CVE-2026-4374 attacked?

It is attacked over the network, in a software library.

Am I affected by CVE-2026-4374?

Check whether you run Rti Cloud Discovery Service, Rti Observability Collector, Rti Queueing Service or one of the others listed at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-4374: RTI Connext Professional XXE in multiple services

CVE-2026-4374 · Severity: critical · CVSS 9.1 · Published 2026-04-01

RTI Connext Professional, a suite of tools used for real-time data distribution in industrial and mission-critical systems, contains a vulnerability in how it processes XML data. An attacker could exploit this to access sensitive files or cause a system shutdown by sending specially crafted data. This could lead to unauthorized data exposure or a disruption of critical communications and operations.

Vendors: Rti.

Quick answers

Is CVE-2026-4374 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-4374 being exploited in the wild.
How severe is CVE-2026-4374?: Critical severity, with a CVSS score of 9.1, published 1 April 2026.
Which products and versions are affected?: Rti Cloud Discovery Service 7.4.0 before 7.7.0, 7.1.0 before 7.3.1.1, 6.1.0 before 6.1.2.34, 6.0.0 before 6.0.*, 5.3.0 before 5.3.*; Rti Observability Collector 7.4.0 before 7.7.0, 7.1.0 before 7.3.1.1, 6.1.0 before 6.1.2.34, 6.0.0 before 6.0.*, 5.3.0 before 5.3.*; Rti Queueing Service 7.4.0 before 7.7.0, 7.1.0 before 7.3.1.1, 6.1.0 before 6.1.2.34, 6.0.0 before 6.0.*, 5.3.0 before 5.3.*; Rti Recording Service 7.4.0 before 7.7.0, 7.1.0 before 7.3.1.1, 6.1.0 before 6.1.2.34, 6.0.0 before 6.0.*, 5.3.0 before 5.3.*; and 1 more.
Is there a fix for CVE-2026-4374?: No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2026-4374 attacked?: It is attacked over the network, in a software library.
Am I affected by CVE-2026-4374?: Check whether you run Rti Cloud Discovery Service, Rti Observability Collector, Rti Queueing Service or one of the others listed at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

An Improper Restriction of XML External Entity Reference (XXE) vulnerability (CWE-611) exists in several RTI Connext Professional components, including the Routing, Recording, and Cloud Discovery services. The flaw occurs during the processing of serialized data, where the XML parser fails to restrict external entity references. A remote, unauthenticated attacker can exploit this by sending malicious XML payloads to trigger 'Serialized Data External Linking' or 'Data Serialization External Entities Blowup.' This can result in the disclosure of sensitive information from the host filesystem or a denial-of-service (DoS) condition. Patches are available in versions 7.7.0, 7.3.1.1, and 6.1.2.34.

Affected products

RTI Connext Professional (Cloud Discovery Service, Recording Service, Routing Service, Queueing Service, Observability Collector) 7.4.0 before 7.7.0, 7.1.0 before 7.3.1.1, 6.1.0 before 6.1.2.34, 6.0.0 before 6.0.*, 5.3.0 before 5.3.*

Timeline

2026-04-01: disclosed: Initial publication date
2026-06-17: advisory: Last updated by vendor

References

https://www.rti.com/vulnerabilities/

This page as Markdown. Free to reuse under CC BY 4.0 with a link back.