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CriticalVulnerabilityCVE-2026-97854updated 29 Oct 2026, 12:31 UTC

Yamaha NWR100 wireless router can run attacker commands

Attackers can send a specially crafted request to this Yamaha wireless router and make it run commands they choose. That could let them take control of the device.

Official, 2 sources
SeverityCriticalCVSS 9.3 of 10
Being exploited?UnclearNo reports either way yet
Fix available?UnclearNo fixed version published in the sources yet
How sure is this?Official, 2 sourcesBacked by an official source

How the attack works simplified

  1. 1Attacker sends requestCrafted request sent to the router
  2. 2Router processes inputInput passed unsanitized to OS
  3. 3OS command runsAttacker-chosen commands execute
  4. ResultAttacker controls the router

What happened

An OS command injection flaw in the Yamaha NWR100 wireless LAN router allows arbitrary operating system commands to be executed via a crafted request.

Why it is dangerous: An attacker who controls the router can run commands on it, potentially intercepting or redirecting traffic on the local network, and use it as a foothold into connected systems.

Are you affected?

You are affected if you run a Yamaha NWR100 wireless LAN router, especially one reachable from untrusted networks.

Yamaha NWR100 wireless LAN router (affected versions not stated in the material)

What to do

  1. Check whether you use a Yamaha NWR100 router and identify its firmware version
  2. Check the Yamaha support site for a firmware update that fixes this issue and install it
  3. Block external access to the router's management interface until a fix is applied
  4. Change default administrator passwords on the device

Timeline

  1. 29 Oct 2026, 12:17 UTC
    Publicly disclosed
  2. 29 Oct 2026, 12:17 UTC
    Reported by NVD · NVD
  3. 29 Oct 2026, 12:18 UTC
    Picked up by Zero Radar
  4. 29 Oct 2026, 12:31 UTC
    GitHub Advisory reported on it · GitHub Advisory

Sources 2 reports, oldest first

Official vendor, government CERT or advisory database

Technical details

ID
CVE-2026-97854 · GHSA-8m66-f8m4-wc2j
CVSS
9.3 / 10
EPSS
1.4% chance of exploitation within 30 days
Disclosed
29 Oct 2026, 12:17 UTC
On Zero Radar
29 Oct 2026, 12:18 UTC (1 min after disclosure)
Last change
29 Oct 2026, 12:31 UTC

The plain-language parts and the attack diagram were written by an AI model (anthropic/claude-haiku-5.5) from the sources above. Facts like versions, exploitation and dates come from the sources themselves. How Zero Radar works

Yamaha NWR100 wireless router can run attacker commands · Zero Radar