# CVE-2026-18457: RTI Connext Professional heap-based buffer overflow in Core Libraries

Source: https://junglewise.ai/threats/cve-2026-18457-heap-based-buffer-overflow-vulnerability-in-rti-connext  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-22. Updated: 2026-09-26  
License: CC BY 4.0 with a link back

CVE-2026-18457 · Severity: info · Published 2026-09-22

RTI Connext Professional is a data distribution middleware used to connect distributed systems and IoT applications. A heap-based buffer overflow in its Core Libraries could allow an attacker to crash the system, corrupt data, or potentially execute arbitrary code, compromising the integrity and availability of dependent applications.

Technologies: [Rti Connext Professional](https://junglewise.ai/threats/technologies/connext-professional). Vendors: [Rti](https://junglewise.ai/threats/vendors/rti).

## Quick answers

**Is CVE-2026-18457 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-18457 being exploited in the wild.

**How severe is CVE-2026-18457?** Informational severity, published 22 September 2026.

**Which products and versions are affected?** Rti Connext Professional 5.2.3 before 5.2.*, 5.3.0 before 5.3.*, 6.0.0 before 6.0.*, 6.1.0 before 6.1.*, 7.0.0 before 7.3.1.6, 7.4.0 before 7.7.0.1.

**Is there a fix for CVE-2026-18457?** 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-2026-18457 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-18457?** Check whether you run Rti Connext Professional 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

A heap-based buffer overflow vulnerability exists in RTI Connext Professional's Core Libraries component. The vulnerability can be triggered via network attack vectors and affects multiple version branches (5.2.3–5.2.*, 5.3.0–5.3.*, 6.0.0–6.0.*, 6.1.0–6.1.*, 7.0.0–7.3.1.6, and 7.4.0–7.7.0.1). Successful exploitation may result in memory corruption, denial of service, or remote code execution depending on attack context and memory layout.

## Affected products

- RTI Connext Professional 5.2.3 before 5.2.*, 5.3.0 before 5.3.*, 6.0.0 before 6.0.*, 6.1.0 before 6.1.*, 7.0.0 before 7.3.1.6, 7.4.0 before 7.7.0.1

## Timeline

- 2026-09-22: disclosed

## References

- [https://www.rti.com/vulnerabilities/](https://www.rti.com/vulnerabilities/)

## Related threats

- [RTI Connext Professional use-after-free in Security Plugins](https://junglewise.ai/threats/cve-2026-8849-use-after-free-vulnerability-in-rti-connext-professional-security)
- [RTI Connext Professional stack-based buffer overflow in core libraries](https://junglewise.ai/threats/cve-2026-7866-stack-based-buffer-overflow-vulnerability-in-rti-connext)
- [RTI Connext Professional out-of-bounds read in core libraries](https://junglewise.ai/threats/cve-2026-18626-out-of-bounds-read-vulnerability-in-rti-connext-professional-core)
- [RTI Connext Professional integer overflow in Core Libraries](https://junglewise.ai/threats/cve-2026-18462-integer-overflow-or-wraparound-improper-access-control)
- [RTI Connext Professional format string injection in Core Libraries](https://junglewise.ai/threats/cve-2026-18461-use-of-externally-controlled-format-string-vulnerability-in-rti)