CVE-2026-82946

Null Pointer Dereference in Mailbox Error Handling

State: Published
Severity: 6.5 Medium
Published: Oct 26, 2026
Updated: Oct 26, 2026
Reserved: Aug 31, 2026

Description

SOEM version 2.0.0 and earlier contains a vulnerability where a malicious device can crash the master system. When the software receives an error response, it clears an internal pointer but continues processing. If another message arrives before timeout, the software attempts to use the cleared pointer, causing a crash. An attacker can trigger this with a simple sequence of two messages.

Scores

CVSS	Score	Vector	Source
3.1	6.5 Medium	CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H	ENISA

Weaknesses

CWE-476 NULL pointer dereference
CWE-690 Unchecked Return Value to NULL Pointer Dereference

Affected Products

Product	Versions
SOEMRT-Labs AB	before 2.0.1Affected

References

https://rt-labs.com/wp-content/uploads/2026/10/RRTL-260921-01.pdfvendor-advisory

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