CRITICALVulnerability
CVE-2026-71256
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].
Properties
- severity
- CRITICAL
- score
- 9.8
- cve_id
- CVE-2026-71256
- vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- published_at
- 2026-08-05T12:18:57.847
- last_modified
- 2026-08-26T17:13:24.800
Related Entities (2)
HAS_WEAKNESS (1)
→[Weakness]Out-of-bounds Read
DESCRIBED_BY (1)
→[Source]NVD
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