CVE-2026-71263

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CVSS 3.1

9.1 critical

EPSS

<1%p20

Published

Aug 5, 2026 (Aug 5, 2026)

Modified

Aug 26, 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.

Weakness: CWE-787
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H

NVD CVE.org GitHub PoCs EPSS (0.3%)

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