CVEvulnerability
CVE-2026-71256
9.8 CRITICAL
Official page ↗
- Status
- Deferred
- Published
- 2026-08-05
- Last modified
- 2026-10-24
- Assigner
- 309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c
- CVSS 3.1 (309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c)
- 9.8 CRITICAL — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Weaknesses
- CWE-125
Description
nanoMODBUS through v1.23.0 contains an out-of-bounds stack read leading to a wild-pointer write in nmbs_read_device_identification_basic / recv_read_device_identification_res in nanomodbus.c. A fixed 3-element stack array order[3] = {0,1,2} maps object IDs to buffer indices. The server-supplied object_id field (0-255, read directly from the wire) is used without any bounds check as buf_index = order[object_id].
Related
Weakness · CWE (1)
- CWE-125 Out-of-bounds Read weakness