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

published 2026-10-20 19 d ago modified 2026-10-29 10 d ago also EUVD-2026-105313

cvss: 5.5; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.1%; EPSS 0.1% chance of exploitation in 30 days, percentile 2%
public exploits: 0; none known

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.

Patch / fix

fixed in 2

HMS Networks PEAK-System Device Driver Setup 5.1.4
HMS Networks PCAN Windows CAN device drivers 5.1.4

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

cisa ICSA-26-293-01 updated 2026-10-20 cvss 5.5

HMS Networks PEAK-System PCAN Windows drivers

HMS Networks PCAN Windows CAN device drivers <=5.1.2 HMS Networks PEAK-System Device Driver Setup <=5.1.2.1151
affected: mitigation “For more information see the associated HMS security advisory.” peak-system.com

From CISA ICS and IT advisories (CSAF, https://github.com/cisagov/CSAF), a U.S. Government work; changed: reduced to products, statuses and remediations. CISA notification · csaf

CISA SSVC

Exploitation: none
Automatable: no
Technical impact: partial
Assessed: 10 d ago (2026-10-29)

Exploit prediction

0.12% chance of exploitation in the next 30 days, higher than 2% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	5.5	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CNA	4.0	6.8	CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
CNA	4.0	6.8	CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Affected products

HMS Networks PEAK-System Device Driver Setup
HMS Networks PCAN Windows CAN device drivers

Classification

Weakness

CWE-787 Out-of-bounds Write

References

Sources

CVE List CVE-2026-109576
NVD CVE-2026-109576

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary