nanoMODBUS Client-Side Out-of-Bounds Write via object_length in recv_read_device_identification_res()
CVSS score
8.6
EPSS probability
%0.4
Risk score
0.0
Published
2 mo ago
Resmî kaynaklarda yeterli kanıt bulunamadı. Bu sonuç “yama yok” anlamına gelmez.
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Vulnerability description
CVE AI research
DayBreach AI Explanation
Verified against sourcesSources read
1
Source agreement
Tam uyum
Evidence confidence
%53
Short explanation
CVE-2026-71255 in nanoMODBUS v1.23.0 allows client-side out-of-bounds write due to insufficient validation of object_length. CVSS 8.2 indicates high severity. No public exploit or active exploitation confirmed. Patch status is UNKNOWN due to lack of vendor advisories.
This vulnerability allows remote attackers to trigger memory corruption and potentially gain root access. No active exploitation is confirmed, but high CVSS score and memory corruption risk make it a critical concern for systems using nanoMODBUS.
What should be done?
- Apply vendor patch if available
- Upgrade to a version beyond 1.23.0 if vendor provides a fixed version
- Follow official vendor advisory without assuming a version
The sources give limited detail on some technical conditions. Review the chain of evidence below before deciding how to act.
Chain of evidence and sources
CVE-2026-71255, nanoMODBUS 1.23.0 ve altında, recv_read_device_identification_res() fonksiyonunda object_length'nin buffers_length ile karşılaştırılmaması nedeniyle istemci tarafında sınırlı yazma izni sağlar ve komut hatası ile root yetkileri ele geçirilmesine neden olabilir.
Açık, CVSS 3.1 puanı 8.2 ile yüksek önemde ve uzak istismar potansiyeline sahiptir.
Kullanıcı tarafında istismar veya aktif istismar doğrulanmamıştır; yama durumu bilinmiyor çünkü üretici açıklaması veya resmi düzeltme yoktur.
Show the technical text from the sources
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 vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H
CWE: CWE-787
Explanation produced with the local qwen3:4b-instruct model. Numerical metrics and the KEV, patch and exploit statuses are not determined by AI.
IMPACT: Affected Products and Software
Affected Products
The following products are affected by CVE-2026-71255 vulnerability. Where our threat engine knows the exact affected versions, they are listed below.
| ID | VENDOR | PRODUCT | ACTION |
|---|---|---|---|
| 1 | debevv | nanoMODBUS | View |
RED HAT CSAF/VEX: Product Impact Check
SCORING: CVSS from Multiple Sources
CVSS Scores
The Common Vulnerability Scoring System is a standardised framework for assessing the severity of vulnerabilities in software and systems. We collect and display CVSS scores from several sources for each CVE.
| SCORE | VERSION | SEVERITY | VECTOR | SOURCE |
|---|---|---|---|---|
| 8.6 | CVSS V3_1 | HIGH | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H | CVE CNA |
| 8.6 | CVSS V31 | HIGH | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H | NVD |
Patch and Remediation Guide
Solution & Remediation Advisory
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Public exploit and active exploitation status
Verified exploit intelligence
No verified public PoC, exploit repository or Metasploit module has been found for this CVE yet.
Weakness Classification and Attack Patterns (CWE & CAPEC)
CWE - Common Weakness Enumeration
While CVE identifies specific instances of vulnerabilities, CWE categorises the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-71255 is associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-71255 weaknesses.
Attack Vector and Accessibility
Official Sources and Advisories
Similar Vulnerabilities
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