Is CVE-2026-29972 actively exploited?

No active exploitation of CVE-2026-29972 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-29972 be exploited remotely?

Yes. CVE-2026-29972 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-29972?

CVE-2026-29972 has a CVSS score of 8.2 (HIGH).

HOME VULNERABILITIESCVE-2026-29972

HIGH

CVE-2026-29972

CWE-121Published: May 8, 2026· Updated: May 13, 2026

8.2

CVSS v3.1

EPSS:0.05%probability of exploitation in 30 daysPercentile:16.0th

Official Description

nanoMODBUS through v1.22.0 has a stack-based buffer overflow in recv_read_registers_res() in nanomodbus.c. When a client calls nmbs_read_holding_registers() or nmbs_read_input_registers(), the library writes register data from the server response to the caller-provided buffer based on the response's byte_count field before validating that byte_count matches the requested quantity. A malicious Modbus TCP server can send a response with byte_count=250 (125 registers) regardless of the requested quantity, causing up to 248 bytes of attacker-controlled data to overflow the buffer, potentially allowing remote code execution.

NVD Source

Technical Analysis

CVE-2026-29972 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in availability disruption (denial of service), with a CVSS base score of 8.2.