PatchTheCVECVE-2026-101103: The PEAK-System PCAN diagnostic call did not validate that the caller-supplied output buffer was large enough
20
Routine
MEDIUM 5.5
CVE-2026-101103 is a medium-severity flaw (CVSS 5.5) affecting affected software. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
The PEAK-System PCAN diagnostic call did not validate that the caller-supplied output buffer was large enough to hold the output record.
Why this priority
- No elevated risk signals yet
No fix is published yet: follow the downgrade or mitigation steps.
Risk facts
| CVSS score | 5.5 (Medium) |
| Attack vector | Local |
| Attack complexity | Low |
| Privileges needed | Low |
| User interaction | None |
| EPSS exploit chance | 0.1% (top 98%) |
| CISA exploited list | No |
| Weakness | CWE-120 |
| Published | 2026-10-20 |
| Last modified | 2026-10-22 |
Publisher (CNA): ICS-CERT
Timeline
- Published CVE record published
- Updated Record last modified
Advisories and coverage
Official advisories
- CISA Alerts and Advisories: HMS Networks PEAK-System PCAN Windows drivers 2026-10-20
Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.