Null Pointer Dereference in Mailbox Error Handling

published 2026-10-26 14 d ago modified 2026-10-26 14 d ago also EUVD-2026-109679

cvss: 6.5; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.2%; EPSS 0.2% chance of exploitation in 30 days, percentile 6%
public exploits: 0; none known

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.

Patch / fix

fixed in 1

RT-Labs AB SOEM 2.0.1

CISA SSVC

Exploitation: none
Automatable: no
Technical impact: partial
Assessed: 14 d ago (2026-10-26)

Exploit prediction

0.17% chance of exploitation in the next 30 days, higher than 6% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	6.5	CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

RT-Labs AB SOEM

Classification

Weakness

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

References

rt-labs.com /wp-content/uploads/2026/10/RRTL-260921-01.pdf
vendor-advisory

Sources

CVE List CVE-2026-82946
NVD CVE-2026-82946

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Summary