CVE-2026-101103 HMS Networks CVE debrief

Who should care

Defenders responsible for HMS Networks PEAK-System PCAN Windows drivers should assess exposure and prioritize verification of affected versions. This includes operators, platform administrators, vulnerability management teams, and security teams who need to verify the versions of PEAK-System Device Driver Setup and PCAN Windows CAN device drivers in their environment and assess exposure based on the provided affected versions.

Why it matters

Defenders should prioritize verifying the versions of PEAK-System Device Driver Setup and PCAN Windows CAN device drivers in their environment and assess exposure based on the provided affected versions.

• Verify the version of PEAK-System Device Driver Setup and PCAN Windows CAN device drivers to determine exposure
• Assess the risk of potential buffer overflow attacks
• Implement compensating controls to mitigate the vulnerability

Technical summary

The PEAK-System PCAN diagnostic call did not validate that the caller-supplied output buffer was large enough to hold the output record. This vulnerability affects PEAK-System Device Driver Setup and PCAN Windows CAN device drivers versions up to 5.1.2.1151 and 5.1.2 respectively. The vulnerability has a CVSS score of 5.5 and is classified as MEDIUM severity. Defenders should prioritize verifying the versions of PEAK-System Device Driver Setup and PCAN Windows CAN device drivers in their environment and assess exposure based on the provided affected versions.

Defensive priority

Defenders should prioritize verifying the versions of PEAK-System Device Driver Setup and PCAN Windows CAN device drivers in their environment and assess exposure based on the provided affected versions.

Recommended defensive actions

• Verify the version of PEAK-System Device Driver Setup and update to 5.1.4 or later if necessary
• Verify the version of PCAN Windows CAN device drivers and update to 5.1.4 or later if necessary
• Assess exposure based on the provided affected versions and consider implementing compensating controls
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The CVE Program record and NVD vulnerability detail provide information on the vulnerability, including its description, CVSS score, and affected versions. The PEAK-System PCAN diagnostic call did not validate that the caller-supplied output buffer was large enough to hold the output record. Defenders should verify the versions of PEAK-System Device Driver Setup and PCAN Windows CAN device drivers in their environment and assess exposure based on the provided affected versions. The vulnerability affects PEAK-System Device Driver Setup

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.