# CVE-2026-82785: Contec CONPROSYS nano Remote I/O Coupler Unit stack-based buffer overflow

Source: https://junglewise.ai/threats/cve-2026-82785-contec-conprosys-nano-remote-i-o-coupler-unit-stack-based-buffer  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-14. Updated: 2026-09-26  
License: CC BY 4.0 with a link back

CVE-2026-82785 · Severity: medium · CVSS 4.3 · Published 2026-09-14

Contec's CONPROSYS nano Remote I/O Coupler Unit (Server Type) is an industrial control device used to manage input/output operations in factory and infrastructure automation systems. A stack-based buffer overflow vulnerability allows a remote attacker to send a specially crafted request that crashes the device, causing a denial-of-service (DoS) and disrupting critical industrial operations.

Technologies: [Contec CONPROSYS nano Remote I/O Coupler Unit (Server Type) CPSN-MCB271](https://junglewise.ai/threats/technologies/conprosys-nano-remote-i-o-coupler-unit-server-type-cpsn-mcb271). Vendors: [Contec](https://junglewise.ai/threats/vendors/contec).

## Quick answers

**Is CVE-2026-82785 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-82785 being exploited in the wild.

**How severe is CVE-2026-82785?** Medium severity, with a CVSS score of 4.3, published 14 September 2026.

**Which products and versions are affected?** Contec CONPROSYS nano Remote I/O Coupler Unit (Server Type) CPSN-MCB271 prior to 1.82.

**Is there a fix for CVE-2026-82785?** 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-2026-82785 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-82785?** Check whether you run Contec CONPROSYS nano Remote I/O Coupler Unit (Server Type) CPSN-MCB271 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 stack-based buffer overflow vulnerability (CWE-121) exists in the Remote I/O Coupler Unit (Server Type) CPSN-MCB271-* when processing specially crafted network requests. The vulnerability is triggered by a remote attacker sending malformed input without requiring authentication. Exploitation of this flaw causes a denial-of-service condition that interrupts the device's operation. The vulnerability affects versions prior to 1.82, and a patch is available in version 1.82 and later.

## Affected products

- Contec CONPROSYS nano Remote I/O Coupler Unit (Server Type) CPSN-MCB271 prior to 1.82

## Timeline

- 2026-09-14: disclosed: CVE-2026-82785 published on NVD

## References

- [https://jvn.jp/en/vu/JVNVU96551518/](https://jvn.jp/en/vu/JVNVU96551518/)
- [https://www.contec.com/api/downloadlogger?download=/-/media/Contec/support/security-info/2026/contec_security_cps_26091000_en.pdf](https://www.contec.com/api/downloadlogger?download=/-/media/Contec/support/security-info/2026/contec_security_cps_26091000_en.pdf)

## Related threats

- [Contec CONPROSYS nano Remote I/O Coupler insufficiently protected credentials](https://junglewise.ai/threats/cve-2026-82786-contec-conprosys-nano-remote-i-o-coupler-insufficiently-protected)
- [Contec CONPROSYS nano Remote I/O Coupler auth bypass in REST API](https://junglewise.ai/threats/cve-2026-82784-contec-conprosys-nano-remote-i-o-coupler-auth-bypass-in-rest-api)