CVE-2026-54410

HIGH 8.6

nanoMODBUS Off-by-One Buffer Overflow in recv_msg_header() via Crafted MBAP Length Field

CVSS Score

8.6

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-193 CWE-787
Vendor	debevv
Product	nanomodbus
Published	Jun 14, 2026
Last Updated	Aug 10, 2026

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CVSS v3 Breakdown

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

Low

Availability

High

Affected Versions

debevv / nanoMODBUS

0 ≤ 1.23.0

References

NVD ↗ CVE.org ↗ EPSS Data ↗

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

Credits

Burxonov Muslimbek