What is CVE-2026-109576?

CVE-2026-109576 is a medium-severity vulnerability in Hms Networks Pcan Windows Can Device Drivers, classified under Out-of-bounds Write. CVSS score: 5.5/10. Published 2026-10-20.

How severe is CVE-2026-109576?

Medium severity. CVSS v3 base score is 5.5 out of 10.

Buffer overflow in Hms Networks Pcan Windows Can Device Drivers

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.

Vulnerability class: Buffer Overflow

Published 2026-10-20.

CVSS v3 metric

CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

References

Frequently asked questions

What is CVE-2026-109576?: CVE-2026-109576 is a medium-severity vulnerability in Hms Networks Pcan Windows Can Device Drivers, classified under Out-of-bounds Write. CVSS score: 5.5/10. Published 2026-10-20.
How severe is CVE-2026-109576?: Medium severity. CVSS v3 base score is 5.5 out of 10.