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CVE PROGRAM SOURCE RECORD9.1 Critical

CVE-2026-71263

FreeModbus LINUXTCP Port Off-by-One Global Buffer Overflow in xMBPortTCPPool()

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.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

cwalter-at FreeModbus

Default version status: unaffected

  • 0 to ≤ *affected

References