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CVE-2026-70388— Memory Corruption via Integer Underflow in Message Length Validation

Quick assessment

Affected
RT-Labs AB SOEM
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

SOEM 2.0.0 及更早版本存在安全漏洞：网络中的恶意设备可发送特制消息，导致主站将数据写入已分配内存边界之外。该软件在计算消息长度值时未进行适当验证，使得负值或极大值能够绕过安全检查。此问题可能导致内存损坏，并可能允许攻击者在主站系统上执行任意代码。

CVSS 8.3 · High
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I. Basic Information for CVE-2026-70388

Vulnerability Information
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Vulnerability Title
Memory Corruption via Integer Underflow in Message Length Validation
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
整数下溢(超界折返)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
RT-Labs AB SOEM 0 ~ 2.0.1 -

II. Public POCs for CVE-2026-70388

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III. Intelligence Information for CVE-2026-70388

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Other References for CVE-2026-70388 (1)

Same Patch Batch · RT-Labs AB · 2026-10-26 · 6 CVEs total

CVE-2026-82944 8.8 HIGH Buffer Overflow in CoE SDO Upload Multi-Segment Data Transfers
CVE-2026-82947 7.1 HIGH Multiple Out-of-Bounds Reads in Frame Processing
CVE-2026-82945 6.5 MEDIUM Memory Corruption via FMMU Configuration Table Overflow
CVE-2026-82943 6.5 MEDIUM Out-of-Bounds Read via Unchecked Length Values
CVE-2026-82946 6.5 MEDIUM Null Pointer Dereference in Mailbox Error Handling

IV. Related Vulnerabilities

Same product: SOEM
Same vendor: RT-Labs AB
Same weakness: CWE-191