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TI-2026-77673 Aliases CVE-2026-101103GHSA-cw79-5c2h-gpr4

Buffer overflow in HMS Networks PEAK-System PCAN Windows drivers

Priority LOW 29CWE-120Published · Updated

Key facts

Attack vector
Local
Privileges required
Low
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-120 and the CVSS impact.

Summary

HMS Networks PEAK-System Device Driver Setup through 5.1.2.1151 and PCAN Windows CAN device drivers through 5.1.2 are affected. The PEAK-System PCAN diagnostic call does not check that the caller-supplied output buffer is large enough for the output record, a classic buffer overflow (CWE-120). A local user with low privileges can trigger it and disrupt availability.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

Description from the CNA

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

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00122 2nd percentileScored 2026-11-07
Fix Fixed PEAK-System Device Driver Setup (HMS Networks): 5.1.4PCAN Windows CAN device drivers (HMS Networks): 5.1.4

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
HMS NetworksPEAK-System Device Driver Setupup to 5.1.2.11515.1.4Patch availableCNA
HMS NetworksPCAN Windows CAN device driversup to 5.1.25.1.4Patch availableCNA
  • PEAK-System Device Driver Setup VendorHMS Networks Affected up to 5.1.2.1151 Fixed in 5.1.4 Patch available CNA
  • PCAN Windows CAN device drivers VendorHMS Networks Affected up to 5.1.2 Fixed in 5.1.4 Patch available CNA

Remediation

Upgrade PEAK-System Device Driver Setup and PCAN Windows CAN device drivers to version 5.1.4.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

  • Fix · CNA PEAK-System Device Driver Setup (HMS Networks) Fixed in 5.1.4
  • Fix · CNA PCAN Windows CAN device drivers (HMS Networks) Fixed in 5.1.4

Timeline

  1. 2026-10-21 Threatist record created from CVE-2026-101103
  2. 2026-10-21 Alias added: GHSA-cw79-5c2h-gpr4
  3. 2026-10-22 Priority changed: MEDIUM → LOW
  4. 2026-10-29 CISA SSVC decision points changed

References

Other 4

  • TI-2024-08499 Authenticated remote code execution in HMS Networks Ewon Flexy 205 CVSS 4.0HIGH 8.6
  • TI-2025-00350 HMS Networks Ewon Flexy 202 Cleartext Transmission of Sensitive Information CVSS 4.0MEDIUM 6.9
  • TI-2020-11349 HMS Industrial Networks AB eCatcher Stack-based Buffer Overflow CVSS 3.1CRITICAL 10.0
  • TI-2024-22369 A compromised HMS Networks Cosy+ device could be used to request a Certificate Signing… CVSS 3.1CRITICAL 9.1
  • TI-2024-22366 Insecure Permission vulnerability in Cosy+ devices running a firmware 21.x below 21.2s10… CVSS 3.1HIGH 8.8
  • TI-2024-22364 Insecure Permissions vulnerability in Cosy+ devices running a firmware 21.x below 21.2s10… CVSS 3.1HIGH 7.5
See all 19 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences