# CVE-2026-18626: RTI Connext Professional out-of-bounds read in core libraries

Source: https://junglewise.ai/threats/cve-2026-18626-out-of-bounds-read-vulnerability-in-rti-connext-professional-core  
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-2026-18626 · Severity: info · Published 2026-09-22

RTI Connext Professional is a middleware platform used to connect distributed systems and applications across networks. An out-of-bounds read vulnerability in its core libraries allows an attacker to read beyond allocated buffer boundaries, potentially exposing sensitive data or causing application instability. This affects multiple versions of the product across different release series.

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

## Quick answers

**Is CVE-2026-18626 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-18626 being exploited in the wild.

**How severe is CVE-2026-18626?** Informational severity, published 22 September 2026.

**Which products and versions are affected?** Rti Connext Professional 5.0.0–5.1.*, 5.2.0–5.2.*, 5.3.0–5.3.*, 6.0.0–6.0.*, 6.1.0–6.1.*, 7.0.0–7.3.1.6, 7.4.0–7.7.0.1.

**Is there a fix for CVE-2026-18626?** 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-2026-18626 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-18626?** 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

An out-of-bounds read vulnerability exists in the core libraries of RTI Connext Professional, enabling an attacker to overread buffer contents beyond their intended boundaries. The vulnerability affects multiple version ranges including 7.4.0–7.7.0.1, 7.0.0–7.3.1.6, and earlier 6.x and 5.x versions. Patched versions are available for active long-term support releases.

## Affected products

- RTI Connext Professional 5.0.0–5.1.*, 5.2.0–5.2.*, 5.3.0–5.3.*, 6.0.0–6.0.*, 6.1.0–6.1.*, 7.0.0–7.3.1.6, 7.4.0–7.7.0.1

## 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 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)
- [RTI Connext Professional off-by-one error in core libraries](https://junglewise.ai/threats/cve-2026-18460-off-by-one-error-out-of-bounds-write-vulnerability-in-rti-connext)