CVE-2026-54410Public exploitNetwork attack vector

Unauthenticated service interruption via MBAP length overflow

Published Jun 14, 2026 · Updated Jun 14, 2026

Off-by-one overflow in nanoMODBUS 1.23.0 and earlier allows remote attackers to interrupt Modbus/TCP servers with a crafted MBAP frame. recv_msg_header() accepts an MBAP Length value of 255, then receives 253 payload bytes at buffer index 8 and writes the last byte beyond the 260-byte buffer into the adjacent index field. No authentication or user interaction is required; the corrupted parser state causes invalid memory access and can also disclose one byte or target unintended registers on systems without memory protection.

CVSS severity8.6
High
EPSS probability0.54%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Off-by-one overflow in nanoMODBUS 1.23.0 and earlier allows remote attackers to interrupt Modbus/TCP servers with a crafted MBAP frame. recv_msg_header() accepts an MBAP Length value of 255, then receives 253 payload bytes at buffer index 8 and writes the last byte beyond the 260-byte buffer into the adjacent index field. No authentication or user interaction is required; the corrupted parser state causes invalid memory access and can also disclose one byte or target unintended registers on systems without memory protection.

The record

CVE
CVE-2026-54410
Published
Jun 14, 2026
Updated
Jun 14, 2026
Vendor
Valerio De Benedetto
Product
nanoMODBUS
Classifications
CWE-787, CWE-193, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 14, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 14, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <=1.23.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Valerio De Benedetto · nanoMODBUSversion=0 <=1.23.0

Published CVSS scores

9.0TuranSecAV:N/AC:L/Au:N/C:P/I:P/A:C
8.6TuranSecCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-787Out-of-bounds Write
CWE-193Off-by-one Error
T1499.004Application or System Exploitation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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