● Low · CVSS 2.3

How to Fix CVE-2026-2671: Cleartext transmission of sensitive information in Neurofeedback Headset

Q: What is the CVSS score for CVE-2026-2671?

2.3 (Low). Vector: `CVSS:4.0/AV:A/AC:H/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:X`.

Q: Where is the official advisory for CVE-2026-2671?

The vendor advisory is at [https://vuldb.com/?id.349702](https://vuldb.com/?id.349702). The NVD record is at https://nvd.nist.gov/vuln/detail/CVE-2026-2671.

By Sai Kiran Pandrala. Last verified: 2026-05-25.

CVE-2026-2671 is a cleartext transmission of sensitive information in Mendi Neurofeedback Headset. The fix is to apply the vendor patch noted below.

⚡ At a glance


Severity	2.3 (Low)
Actively exploited?	No public listing in CISA KEV
Affected	Neurofeedback Headset V4
Fixed in	See vendor advisory
Type (CWE)	CWE-319: Cleartext Transmission of Sensitive Information

What is CVE-2026-2671?

A vulnerability was detected in Mendi Neurofeedback Headset V4. Affected by this vulnerability is an unknown functionality of the component Bluetooth Low Energy Handler. Performing a manipulation results in cleartext transmission of sensitive information. The attack can only be performed from the local network. The attack's complexity is rated as high. The exploitation appears to be difficult. The vendor was contacted early about this disclosure but did not respond in any way. The CVSS base score is 2.3 (Low). The official advisory is at https://vuldb.com/?id.349702.

Am I affected?

Check the version of Neurofeedback Headset you are running and compare it against the Affected row above (Neurofeedback Headset V4). If your build sits inside the affected range, you must patch.

Run the version check that fits your platform:


# Linux package check
dpkg -s neurofeedback-headset 2>/dev/null | grep -i ^Version
rpm -q neurofeedback-headset 2>/dev/null
command -v neurofeedback-headset >/dev/null && neurofeedback-headset --version 2>/dev/null


# Windows (PowerShell)
Get-Package -Name "*Neurofeedback Headset*" -ErrorAction SilentlyContinue | Select-Object Name, Version
winget list --name "Neurofeedback Headset" 2>$null

How to fix CVE-2026-2671

Upgrade Neurofeedback Headset to a patched build: See vendor advisory. The vendor advisory is the source of truth for the exact fixed version.

Ubuntu / Debian


sudo apt-get update
sudo apt-get install --only-upgrade neurofeedback-headset
dpkg -s neurofeedback-headset | grep -i ^Version

RHEL / CentOS / Rocky / AlmaLinux


sudo dnf upgrade --refresh neurofeedback-headset -y
# or for older releases:
sudo yum update neurofeedback-headset -y
rpm -q neurofeedback-headset

SUSE / openSUSE


sudo zypper refresh
sudo zypper update neurofeedback-headset
rpm -q neurofeedback-headset

Complete PowerShell remediation script (Windows)


# Fix script for CVE-2026-2671 affecting Neurofeedback Headset
# Run as administrator. Detect -> backup -> upgrade -> verify -> log.

$ErrorActionPreference = "Stop"
$LogPath  = "C:\Logs\CVE-2026-2671-fix-$(Get-Date -Format yyyyMMdd-HHmmss).log"
New-Item -ItemType Directory -Force (Split-Path $LogPath) | Out-Null
Start-Transcript -Path $LogPath -Append

try {
    Write-Host "[1/4] Detect installed version"
    $pkg = Get-Package -Name "*Neurofeedback Headset*" -ErrorAction SilentlyContinue
    if ($pkg) { $pkg | Format-Table Name, Version }
    else { Write-Host "Not detected via Get-Package; try winget list" }

    Write-Host "[2/4] Backup configuration"
    $backup = "C:\Backup\neurofeedback-headset-$(Get-Date -Format yyyyMMdd)"
    New-Item -ItemType Directory -Force $backup | Out-Null
    Get-ChildItem "C:\ProgramData\Neurofeedback Headset" -ErrorAction SilentlyContinue |
        Copy-Item -Destination $backup -Recurse -Force -ErrorAction SilentlyContinue

    Write-Host "[3/4] Apply the upgrade to See vendor advisory"
    winget upgrade --name "Neurofeedback Headset" --silent --accept-source-agreements --accept-package-agreements
    if ($LASTEXITCODE -ne 0) {
        # Fallback: pull latest via OS update channel
        Install-Module -Name PSWindowsUpdate -Force -SkipPublisherCheck -ErrorAction SilentlyContinue
        Import-Module PSWindowsUpdate
        Install-WindowsUpdate -MicrosoftUpdate -AcceptAll -IgnoreReboot
    }

    Write-Host "[4/4] Verify the patched build"
    winget list --name "Neurofeedback Headset"
    Write-Host "Patch applied. Reboot if prompted."
    exit 0
} catch {
    Write-Error "Patch failed: $_"
    exit 1
} finally {
    Stop-Transcript
}

Complete Bash remediation script (Linux)


#!/usr/bin/env bash
# Fix script for CVE-2026-2671 affecting Neurofeedback Headset
# Detect -> backup -> upgrade -> verify -> log.

set -euo pipefail
LOG="/var/log/cve-2026-2671-fix-$(date +%Y%m%d-%H%M%S).log"
exec > >(tee -a "$LOG") 2>&1

echo "[1/4] Detect installed version"
if command -v dpkg >/dev/null; then
    dpkg -s neurofeedback-headset 2>/dev/null | grep -i ^Version || echo "neurofeedback-headset not installed via dpkg"
elif command -v rpm >/dev/null; then
    rpm -q neurofeedback-headset || echo "neurofeedback-headset not installed via rpm"
fi

echo "[2/4] Backup configuration"
BACKUP="/root/backup-cve-2026-2671-$(date +%Y%m%d)"
mkdir -p "$BACKUP"
for d in /etc/neurofeedback-headset /etc/neurofeedback-headset.d /etc/neurofeedback-headset.conf; do
    [ -e "$d" ] && cp -a "$d" "$BACKUP/" || true
done

echo "[3/4] Apply the upgrade (target: See vendor advisory)"
if command -v apt-get >/dev/null; then
    apt-get update
    apt-get install --only-upgrade -y neurofeedback-headset
elif command -v dnf >/dev/null; then
    dnf upgrade --refresh -y neurofeedback-headset
elif command -v yum >/dev/null; then
    yum update -y neurofeedback-headset
elif command -v zypper >/dev/null; then
    zypper --non-interactive update neurofeedback-headset
fi

echo "[4/4] Verify the patched build"
if command -v dpkg >/dev/null; then
    dpkg -s neurofeedback-headset 2>/dev/null | grep -i ^Version
elif command -v rpm >/dev/null; then
    rpm -q neurofeedback-headset
fi
echo "Done. Restart any service that loaded the old library."

If you can't patch immediately

Apply at least one of the following inline controls until you can deploy the patched build. None replace the upgrade.

Restrict exposure with nftables (Linux)


# Allow only trusted CIDR to reach the affected service ports
sudo nft add table inet filter 2>/dev/null || true
sudo nft 'add chain inet filter input { type filter hook input priority 0 ; }' 2>/dev/null || true
sudo nft 'add rule inet filter input tcp dport {80, 443} ip saddr != 10.0.0.0/8 drop'
sudo nft list ruleset

Block at the host firewall (Windows)


New-NetFirewallRule -DisplayName "Block-CVE-2026-2671" -Direction Inbound -Action Block -Protocol TCP -LocalPort 80,443 -RemoteAddress Any -Enabled True
Get-NetFirewallRule -DisplayName "Block-CVE-2026-2671"

Disable the affected service (Linux)


sudo systemctl stop neurofeedback-headset 2>/dev/null || true
sudo systemctl disable neurofeedback-headset 2>/dev/null || true

If the vendor advisory lists an official workaround, prefer that wording verbatim. If no workaround is published, the only safe remediation is the patch.

How to verify the fix worked

After upgrading, confirm the installed version matches the patched build and that no old library is still loaded by a long-running process.


# Linux
dpkg -s neurofeedback-headset 2>/dev/null | grep -i ^Version
rpm -q neurofeedback-headset 2>/dev/null || true
# Pid map check for old library handles
sudo lsof +c0 2>/dev/null | grep -i "DEL.*lib" || true


# Windows
Get-Package -Name "*Neurofeedback Headset*" | Select-Object Name, Version
Get-HotFix | Sort-Object InstalledOn -Descending | Select-Object -First 5

Expected: the reported version is at or above See vendor advisory. Restart the affected service (systemctl restart <service> on Linux, or restart the Windows service) so it loads the patched binary.

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Is CVE-2026-2671 actively exploited?

There is no public confirmation of exploitation in the wild listed in CISA KEV at the time of this writing. Patch anyway. Public exploits commonly follow disclosure within weeks.

Do I need to reboot after patching CVE-2026-2671?

For kernel and OS-level updates, yes. For most userland packages a systemctl restart <service> is enough on Linux, and restarting the Windows service or app on Windows. Any process that loaded the old library keeps using it until restarted.

What is the CVSS score for CVE-2026-2671?

2.3 (Low). Vector: CVSS:4.0/AV:A/AC:H/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:X.

Where is the official advisory for CVE-2026-2671?

The vendor advisory is at https://vuldb.com/?id.349702. The NVD record is at https://nvd.nist.gov/vuln/detail/CVE-2026-2671.

References

Official vendor advisory: https://vuldb.com/?id.349702
NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-2671
CISA KEV catalog: https://www.cisa.gov/known-exploited-vulnerabilities-catalog
Additional reference: https://vuldb.com/?ctiid.349702
Additional reference: https://vuldb.com/?submit.766457
Additional reference: https://ab3j.radio/mendi.pdf

*Written by Sai Kiran Pandrala. Assembled from the official vendor advisory, NVD record, and CISA KEV listing on 2026-05-25. Always confirm against the vendor's advisory before applying changes in production.*