CVE-2026-54410

7.8 highEPSS 0.5%

High (7.8). EPSS 0.5% chance of exploitation in the next 30 days.

nanoMODBUS through v1.23.0 contains an off-by-one buffer overflow in the recv_msg_header function of the Modbus/TCP server that allows remote unauthenticated attackers to write one attacker-controlled byte past the end of the 260-byte receive buffer by sending a crafted MBAP frame whose Length field is set to 255.

Severity

CVSS 4.0

7.8 high

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:H/SC:N/SI:N/SA:N/E:P/AU:Y

CVSS 3.1

8.6 high

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

EPSS: 0.5% chance of exploitation in the next 30 days; higher than 45% of CVEs (scores of 2026-10-31)
CWEs: CWE-193, CWE-787
Published: 2026-06-14
Modified: 2026-08-10
Record from: the NVD, synced 2026-10-19

References

https://cwe.mitre.org/data/definitions/193.html
https://cwe.mitre.org/data/definitions/787.html
https://github.com/debevv/nanoMODBUS
https://github.com/debevv/nanoMODBUS/blob/v1.23.0/nanomodbus.c#L369

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