What is CVE-2026-101103?

CVE-2026-101103 is a medium-severity vulnerability, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 5.5/10. Published 2026-10-20.

How severe is CVE-2026-101103?

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

CVE-2026-101103

CVE-2026-101103

The PEAK-System PCAN diagnostic call did not validate that the caller-supplied output buffer was large enough to hold the output record.

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.

Weakness classification (CWE)

CWE-120 — Buffer Copy without Checking Size of Input (Classic Buffer Overflow)

References

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

Frequently asked questions

What is CVE-2026-101103?: CVE-2026-101103 is a medium-severity vulnerability, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 5.5/10. Published 2026-10-20.
How severe is CVE-2026-101103?: Medium severity. CVSS v3 base score is 5.5 out of 10.