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TI-2026-80282 Aliases CVE-2026-70388GHSA-3w9x-57hf-mwj3

SOEM Memory Corruption via Integer Underflow in Message Length Validation

Priority LOW 37CWE-191Published · Updated

Key facts

Attack vector
Adjacent network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
Low · High · High
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA.

Summary

SOEM versions before 2.0.1 let a malicious device on the network send specially crafted messages that make the master write data outside its allocated memory. The software performs arithmetic on message length values without validating them, so negative or extremely large values bypass safety checks, tracked as CWE-191, CWE-195 and CWE-787. An attacker can corrupt memory and potentially execute arbitrary code on the master system; CVSS 3.1 base score 8.3 (HIGH). It is not listed in CISA KEV, and no public exploit link is referenced.

Written with Claude Haiku 5.5 from the sources below · 2026-11-02

Description from the CNA

SOEM version 2.0.0 and earlier contains vulnerabilities where a malicious device on the network can send specially crafted messages that cause the master to write data outside allocated memory boundaries. The software performs arithmetic on message length values without proper validation, allowing negative or extremely large values to bypass safety checks. This can corrupt memory and potentially allow an attacker to execute arbitrary code on the master system.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00213 11th percentileScored 2026-11-07
Fix Fixed SOEM (RT-Labs AB): 2.0.1

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

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

Affected products

VendorProductAffected versionsFixed inStatusSource
RT-LabsSOEMbefore 2.0.12.0.1Patch availableCNA
  • SOEM VendorRT-Labs Affected before 2.0.1 Fixed in 2.0.1 Patch available CNA

Remediation

Upgrade SOEM to version 2.0.1 or later, which fixes the issue. RT-Labs AB published the fix; the affected range is all versions from 0 before 2.0.1.

Written with Claude Haiku 5.5 from the sources below · 2026-11-02

  • Fix · CNA SOEM (RT-Labs AB) Fixed in 2.0.1

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Advisory ·

    RT-Labs SOEM — rt-labs.com/wp-content/uploads/2026/10/RRTL-260921-01.pdf

    6 records Highest priority Priority LOW 6 LOW

    Other records, highest priority first

    • TI-2026-80287 Buffer overflow in SOEM CoE SDO multi-segment data transfersPriority LOW 39
    • TI-2026-80300 Out-of-bounds reads in SOEM frame processing expose memoryPriority LOW 30
    • TI-2026-80289 NULL pointer dereference in SOEM mailbox error handlingPriority LOW 28
    Show all 6 records → Advisory →

Timeline

  1. 2026-10-26 Threatist record created from CVE-2026-70388
  2. 2026-10-26 Priority changed: MEDIUM → LOW
  3. 2026-10-27 Alias added: GHSA-3w9x-57hf-mwj3
  4. 2026-11-02 CISA SSVC decision points changed

References

Advisory 1

  • TI-2026-82626 Out-of-bounds write when parsing AR Vendor Block requests in RT-Labs P-Net CVSS 4.0CRITICAL 9.3
  • TI-2026-82632 Resource exhaustion from RPC sessions kept for unknown interface requests CVSS 4.0HIGH 8.7
  • TI-2026-82630 NULL pointer dereference in RT-Labs P-Net on implicit read requests CVSS 4.0HIGH 8.7
  • TI-2026-82627 NULL pointer dereference in P-Net lets remote attackers crash devices CVSS 4.0HIGH 8.7
  • TI-2026-82625 Infinite loop in RT-Labs P-Net PDPortDataCheck record handling CVSS 4.0HIGH 8.7
  • TI-2025-23482 Out-of-bounds write in RT-Labs P-Net CVSS 3.1CRITICAL 9.8
See all 28 →

Sources

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