Critical severity9.1NVD Advisory· Published Aug 5, 2026· Updated Aug 26, 2026

CVE-2026-71263

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.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

Cwalter At/freemodbusllm-create
Freemodbus/freemodbusllm-fuzzy

Patches

Vulnerability mechanics

References

github.com/cwalter-at/freemodbus/blob/master/demo/LINUXTCP/port/porttcp.cnvd

News mentions

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