# CVE-2026-105960: HMS Networks PEAK-System PCAN buffer overflow in driver

Source: https://junglewise.ai/threats/cve-2026-105960-peak-system-pcan-contains-a-vulnerable-operation-involving-a  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-20. Updated: 2026-10-20  
License: CC BY 4.0 with a link back

CVE-2026-105960 · Severity: medium · CVSS 5.5 · Published 2026-10-20

HMS Networks PEAK-System PCAN is a Windows device driver for CAN bus interfaces used in industrial systems. The driver contains multiple buffer overflow and validation flaws that allow a local attacker to crash the Windows kernel or cause memory corruption, potentially disrupting critical infrastructure like transportation and energy systems.

Technologies: [HMS Networks PCAN Windows CAN device drivers](https://junglewise.ai/threats/technologies/pcan-windows-can-device-drivers), [HMS Networks PEAK-System Device Driver Setup](https://junglewise.ai/threats/technologies/peak-system-device-driver-setup). Vendors: [HMS Networks](https://junglewise.ai/threats/vendors/hms-networks).

## Quick answers

**Is CVE-2026-105960 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-105960 being exploited in the wild.

**How severe is CVE-2026-105960?** Medium severity, with a CVSS score of 5.5, published 20 October 2026.

**Which products and versions are affected?** HMS Networks PCAN Windows CAN device drivers <=5.1.2; HMS Networks PEAK-System Device Driver Setup <=5.1.2.1151.

**Is there a fix for CVE-2026-105960?** Yes: fixed in PEAK-System Device Driver Setup 5.1.4, PCAN Windows CAN device drivers 5.1.4. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-105960 attacked?** It is attacked with local access.

**Am I affected by CVE-2026-105960?** Check whether you run HMS Networks PCAN Windows CAN device drivers or HMS Networks PEAK-System Device Driver Setup 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.

## How to fix

- Fixed in PEAK-System Device Driver Setup 5.1.4, PCAN Windows CAN device drivers 5.1.4

## Technical details

The driver fails to validate caller-supplied output buffer sizes in diagnostic calls and uses unvalidated record counts for variable-length copies without capping to actual output length. CVE-2026-105960 specifically involves insufficient validation of array indices in a receive-record copy operation. All vulnerabilities are triggered locally with low privilege and no user interaction required, resulting in kernel-mode memory corruption and denial of service.

## Affected products

- HMS Networks PEAK-System Device Driver Setup <=5.1.2.1151
- HMS Networks PCAN Windows CAN device drivers <=5.1.2

## Timeline

- 2026-10-20: disclosed

## References

- [https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-293-01.json](https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-293-01.json)
- [https://www.cisa.gov/news-events/ics-advisories/icsa-26-293-01](https://www.cisa.gov/news-events/ics-advisories/icsa-26-293-01)

## Related threats

- [HMS Networks PEAK-System PCAN untrusted pointer dereference](https://junglewise.ai/threats/cve-2026-110322-the-peak-system-pcan-type-0x4030-processing-path-fails-to)
- [HMS Networks PEAK-System PCAN drivers kernel crash](https://junglewise.ai/threats/cve-2026-109576-hms-networks-peak-system-pcan-windows-drivers)
- [HMS Networks PEAK-System PCAN buffer overflow in DLC parser](https://junglewise.ai/threats/cve-2026-103672-the-peak-system-pcan-parser-indexes-a-length-table-using)
- [HMS Networks PEAK-System PCAN buffer overflow in diagnostic call](https://junglewise.ai/threats/cve-2026-101103-the-peak-system-pcan-diagnostic-call-did-not-validate-that-the)