CVE-2026-71263
Critical · 9.1CVSS
9.1
EPSS
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Published
Aug 5, 2026
CISA due date
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The record
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 packages
| Ecosystem | Package | Introduced | Fixed |
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