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TI-2026-39286 Aliases CVE-2026-54410GHSA-6f53-f2m4-6j2h

nanoMODBUS Off-by-One Buffer Overflow in recv_msg_header() via Crafted MBAP Length Field

Priority MEDIUM 41CWE-193Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
—
Confidentiality · integrity · availability
Low · Low · High
Fix status
No fix listed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA.

Summary

nanoMODBUS through v1.23.0 contains an off-by-one buffer overflow in the recv_msg_header function of the Modbus/TCP server that allows remote unauthenticated attackers to write one attacker-controlled byte past the end of the 260-byte receive buffer by sending a crafted MBAP frame whose Length field is set to 255.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00541 45th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
debevvnanoMODBUSup to 1.23.0—No fix listedCNA
  • nanoMODBUS Vendordebevv Affected up to 1.23.0 Fixed in — No fix listed CNA

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-54410
  2. 2026-10-03 Alias added: GHSA-6f53-f2m4-6j2h
  3. 2026-10-25 EPSS moved to the below the 50th percentile

References

Other 4

  • TI-2026-49925 nanoMODBUS Client-Side Out-of-Bounds Read Leading to Wild-Pointer Write via object_id CVSS 3.1CRITICAL 9.8
  • TI-2026-49923 nanoMODBUS Server-Side Out-of-Bounds Write in handle_read_file_record() CVSS 3.1CRITICAL 9.8
  • TI-2026-49924 nanoMODBUS Client-Side Out-of-Bounds Write via object_length in recv_read_device_identification_res() CVSS 3.1HIGH 8.6

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences