Vulnerability details
CVE-2026-71255
debevv nanoMODBUS
nanoMODBUS Client-Side Out-of-Bounds Write via object_length in recv_read_device_identification_res()
CVSS 3.1
8.6High
Official description
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.
CVSS scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 8.6High | 3.1 | CVEProject cvelistV5 (CNA) (TuranSec) | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H |
Affected products
| Vendor | Product | Versions | Source |
|---|---|---|---|
| debevv | nanoMODBUS | v ≤ 1.23.0 | CVEProject cvelistV5 (CNA) |
References and advisories
2- https://github.com/debevv/nanoMODBUS third-party-advisory
- https://github.com/debevv/nanoMODBUS/blob/master/nanomodbus.c third-party-advisory
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Details
- Published
- 2026-08-05
- Last updated
- 2026-08-10
- State
- Published
- Assigner (CNA)
- TuranSec
Exploit prediction (EPSS)
0.38%
Probability of exploitation in 30 days
32.7%
Percentile (among all CVEs)
SSVC assessment (CISA)
- Automatable
- Yes
- Exploitation
- None
- Technical impact
- Partial
Weaknesses (CWE)
- CWE-787