# CVE-2026-18461: RTI Connext Professional format string injection in Core Libraries

Source: https://junglewise.ai/threats/cve-2026-18461-use-of-externally-controlled-format-string-vulnerability-in-rti  
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-2026-18461 · Severity: info · Published 2026-09-22

RTI Connext Professional is middleware that enables real-time data sharing between distributed applications in automotive, industrial, and financial systems. A format string vulnerability in its Core Libraries could allow an attacker to read memory, crash the application, or potentially execute code if they can inject malicious format strings into the system. Organizations using affected versions should apply the security patches released by RTI.

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

## Quick answers

**Is CVE-2026-18461 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-18461 being exploited in the wild.

**How severe is CVE-2026-18461?** Informational severity, published 22 September 2026.

**Which products and versions are affected?** Rti Connext Professional 7.5.0 to 7.7.0.0, 7.3.0.10 to 7.3.1.5.

**Is there a fix for CVE-2026-18461?** 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-2026-18461 attacked?** It is attacked over the network or with local access, in a software library.

**Am I affected by CVE-2026-18461?** 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

The Core Libraries component in RTI Connext Professional contains a use of externally-controlled format string vulnerability that enables format string injection attacks. An attacker with network access or local access to the system can inject format strings to read or write memory, leading to information disclosure or denial of service. RTI has released patches for affected versions (7.7.0.1 and later for the 7.5.x branch, 7.3.1.6 and later for the 7.3.x branch).

## Affected products

- RTI Connext Professional 7.5.0 to 7.7.0.0, 7.3.0.10 to 7.3.1.5

## 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 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)