What is CVE-2026-71255?

CVE-2026-71255 is a high-severity vulnerability in Debevv Nanomodbus, classified under Out-of-bounds Write. CVSS score: 8.6/10. Published 2026-08-05.

How severe is CVE-2026-71255?

High severity. CVSS v3 base score is 8.6 out of 10.

Buffer overflow in Debevv Nanomodbus

CVE-2026-71255

nanoMODBUS through v1.23.0 contains an out-of-bounds write in the Modbus client-side recv_read_device_identification_res function (FC 0x2B/MEI 0x0E, Read Device Identification) in nanomodbus.c. The server-supplied object_length field (0-246) is validated only against the remaining PDU size (res_size_left) and is never validated against the caller-supplied buffers_length parameter.

Vulnerability class: Buffer Overflow

EPSS: 0.002 (12.8th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.6 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H.

Affected products

Debevv Nanomodbus — versions 0

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

References

309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c (third-party-advisory)
309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c (third-party-advisory)

Frequently asked questions

What is CVE-2026-71255?: CVE-2026-71255 is a high-severity vulnerability in Debevv Nanomodbus, classified under Out-of-bounds Write. CVSS score: 8.6/10. Published 2026-08-05.
How severe is CVE-2026-71255?: High severity. CVSS v3 base score is 8.6 out of 10.