Is CVE-2026-30803 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-30803 being exploited in the wild.

How severe is CVE-2026-30803?

Informational severity, with a CVSS score of 8.8, published 17 June 2026.

Which products and versions are affected?

Rti Connext Micro (Core Libraries) 4.0.0 before 4.3.0.

Is there a fix for CVE-2026-30803?

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-2026-30803 attacked?

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

Am I affected by CVE-2026-30803?

Check whether you run Rti Connext Micro (Core Libraries) 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-2026-30803: RTI Connext Micro integer underflow in Core Libraries

CVE-2026-30803 · Severity: info · CVSS 8.8 · Published 2026-06-17

A vulnerability exists in the core libraries of RTI Connext Micro, a communication framework used in embedded and real-time systems. An attacker could exploit this flaw to crash the system or gain unauthorized access to sensitive data stored in memory. This could lead to significant service disruptions or the exposure of confidential operational information.

Vendors: Rti.

Quick answers

Is CVE-2026-30803 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-30803 being exploited in the wild.
How severe is CVE-2026-30803?: Informational severity, with a CVSS score of 8.8, published 17 June 2026.
Which products and versions are affected?: Rti Connext Micro (Core Libraries) 4.0.0 before 4.3.0.
Is there a fix for CVE-2026-30803?: 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-2026-30803 attacked?: It is attacked over the network, in a software library.
Am I affected by CVE-2026-30803?: Check whether you run Rti Connext Micro (Core Libraries) 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 integer underflow (CWE-191) exists in the Core Libraries of RTI Connext Micro versions 4.0.0 through 4.2.x. The flaw occurs during memory management or packet processing, where a wrap-around error allows an attacker to trigger a buffer overread. This can be exploited remotely over the network without authentication or user interaction. Successful exploitation can result in the disclosure of sensitive information from the process memory or a denial-of-service condition. The issue is addressed in version 4.3.0.

Affected products

RTI Connext Micro (Core Libraries) 4.0.0 before 4.3.0

Timeline

2026-06-17: disclosed
2026-06-17: advisory

References

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

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