---
title: "CVE-2026-103672: PEAK-System PCAN - Buffer Overflow"
description: "PEAK-System PCAN parser contains a buffer overflow caused by lack of DLC length validation, letting attackers execute arbitrary code via crafted payload, exploit requires attacker-controlled DLC input."
url: https://panop.io/threat-heartbeat/CVE-2026-103672/
---

# CVE-2026-103672 PEAK-System PCAN - Buffer Overflow

PEAK-System PCAN parser contains a buffer overflow caused by lack of DLC length validation, letting attackers execute arbitrary code via crafted payload, exploit requires attacker-controlled DLC input.

CVSS base score 7.1 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Required

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-103672)

## Details

Type

Buffer Overflow

Impact

Remote Code Execution

CVSS vector

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

Published

20 October 2026

Updated

21 October 2026

Weakness

[CWE-129](https://cwe.mitre.org/data/definitions/129.html)

## Vendor fix

Update to the latest version with DLC length validation.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-103672](https://nvd.nist.gov/vuln/detail/CVE-2026-103672)
- [https://www.cisa.gov/news-events/ics-advisories/icsa-26-293-01](https://www.cisa.gov/news-events/ics-advisories/icsa-26-293-01)
- [https://www.hms-networks.com/cybersecurity](https://www.hms-networks.com/cybersecurity)
- [https://www.peak-system.com/support/downloads/software/](https://www.peak-system.com/support/downloads/software/)
- [https://github.com/cisagov/CSAF/blob/develop/csaf\_files/OT/white/2026/icsa-26-293-01.json](https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-293-01.json)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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