CVE-2026-109576

MEDIUM 5.5

HMS Networks PEAK-System PCAN Windows drivers Out-of-bounds Write

CVSS Score

5.5

EPSS Score

0.0%

EPSS Percentile

0th

The parser in PEAK-System PCAN driver correctly detected the malformed record, but the loop iterating the record list advanced its processed-bytes counter even when a record had been rejected as invalid.

CWE	CWE-787
Vendor	hms networks
Product	peak-system device driver setup
Published	Oct 20, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Affected Versions

HMS Networks / PEAK-System Device Driver Setup

0 ≤ 5.1.2.1151

HMS Networks / PCAN Windows CAN device drivers

0 ≤ 5.1.2

References

NVD ↗ CVE.org ↗ EPSS Data ↗

hms-networks.com: https://www.hms-networks.com/cybersecurity peak-system.com: https://www.peak-system.com/support/downloads/software/ cisa.gov: https://www.cisa.gov/news-events/ics-advisories/icsa-26-293-01 github.com: https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-293-01.json

Credits

Seyeon Bang reported these vulnerabilities to CISA.