CVE-2026-71263

CriticalCVSS 9.1/10Last modified Oct 24, 2026

Description

The LINUXTCP port of FreeModbus contains an off-by-one bounds check in xMBPortTCPPool (demo/LINUXTCP/port/porttcp.c). The check uses a strict greater-than comparison instead of greater-than-or-equal against the 263-byte MB_TCP_BUF_SIZE limit.

Metrics

CVSS 3.1 9.1/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H

Weakness enumeration

CWE-787

Affected software

VendorProductVersions
cwalter-atFreeModbus<= *

References

Timeline

Published
Aug 5, 2026
Last modified
Oct 24, 2026
NVD status
Deferred

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