High severity · published Oct 20, 2026
CVE-2026-103672
HMS Networks PEAK-System PCAN Windows drivers Improper Validation of Array Index
7.1
CVSS
0.1%
EPSS
No
On KEV
Description
The PEAK-System PCAN parser indexes a length table using attacker-controlled DLC without enforcing DLC <= 0x0f, then copies attacker payload from record+0x1c into a fixed-size stack destination.
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H
Attack vector
Local
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
None
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.1% · higher than 2% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
PW
PCAN Windows CAN device drivers · HMS Networks
through 5.1.2 · source: vendor
PD
PEAK-System Device Driver Setup · HMS Networks
through 5.1.2.1151 · source: vendor
In the news
VulnerabilityHigh
HMS Networks PEAK-System PCAN Windows drivers
View CSAF
Summary
Successful exploitation of these vulnerabilities could crash the Windows kernel.
The following versions of HMS Networks PEAK-System PCAN Windows drivers are affected:
PEAK-System Device Driver Setup <=5.1.2.1151 (CVE-2026-109576, CVE-2026-101103, CVE-2026-94188, CVE-2026-103672, CVE-2026-110322, CVE-2026-105960)
PCAN Windows CAN device drivers <=5.1.2 (CVE-2026-109576, CVE-2026-101103, CVE-2026-94188, CVE-2026-103672, CVE-2026-110322, CVE-2026-105960)
CVSS
Vendor
Equipment
v3 7.1
HMS Networks
PEAK-System Device Driver Setup
5 Vulnerabilities
Out-of-bounds Write, Buffer Copy without Checking Size of Input ('Classic Buffer Overflow'), Improper Validation of Array Index, Untrusted Pointer Dereference, Improper Handling of Length Parameter Inconsistency
Background
Critical Infrastructure Sectors: Transportation Systems, Healthcare and Public Health, Energy, Critical Manufacturing
Countries/Areas Deployed: Worldwide
Company Headquarters Location: Sweden
Vulnerabilities
Expand All +
CVE-2026-109576
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.
Read More
2 Affected Products
HMS Networks PEAK-System Device Driver Setup: <=5.1.2.1151
Product Status: known_affected
Remediation...
Oct 20, 2026·US-CERT ICS Advisories
Affected product
PW
PCAN Windows CAN device drivers
HMS Networks
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-103672
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-103672
github.com
https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-293-01.json
www.cisa.gov
https://www.cisa.gov/news-events/ics-advisories/icsa-26-293-01
www.hms-networks.com
https://www.hms-networks.com/cybersecurity
www.peak-system.com
https://www.peak-system.com/support/downloads/software/
More from PCAN Windows CAN device drivers
5.5
CVE-2026-105960
HMS Networks PEAK-System PCAN Windows drivers Improper Handling of Length Parameter Inconsistency
5.5
CVE-2026-110322
HMS Networks PEAK-System PCAN Windows drivers Untrusted Pointer Dereference
5.5
CVE-2026-101103
HMS Networks PEAK-System PCAN Windows drivers Classic Buffer Overflow
5.5
CVE-2026-109576
HMS Networks PEAK-System PCAN Windows drivers Out-of-bounds Write