● High · CVSS 8.5

How to Fix CVE-2026-27509: Missing authentication in Unitree Go2

Q: What is the CVSS score for CVE-2026-27509?

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

Q: Where is the official advisory for CVE-2026-27509?

The vendor advisory is at [https://boschko.ca/unitree-go2-rce/](https://boschko.ca/unitree-go2-rce/). The NVD record is at https://nvd.nist.gov/vuln/detail/CVE-2026-27509.

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

CVE-2026-27509 is a missing authentication in UnitreeRobotics Unitree Go2. The fix is to apply the vendor patch noted below.

⚡ At a glance


Severity	8.5 (High)
Actively exploited?	No public listing in CISA KEV
Affected	Unitree Go2 1.1.7 to <=1.1.9; Unitree Go2 1.1.11
Fixed in	See vendor advisory
Type (CWE)	CWE-306 Missing Authentication for Critical Function

What is CVE-2026-27509?

Unitree Go2 firmware versions V1.1.7 through V1.1.9 and V1.1.11 (EDU) do not implement DDS authentication or authorization for the Eclipse CycloneDDS topic rt/api/programming_actuator/request handled by actuator_manager.py. A network-adjacent, unauthenticated attacker can join DDS domain 0 and publish a crafted message (api_id=1002) containing arbitrary Python, which the robot writes to disk under /unitree/etc/programming/ and binds to a physical controller keybinding. When the keybinding is pressed, the code executes as root and the binding persists across reboots. The CVSS base score is 8.5 (High), which puts this in the upper risk band and warrants a fast patch cycle. The official advisory is at https://boschko.ca/unitree-go2-rce/.

Am I affected?

Check the version of Unitree Go2 you are running and compare it against the Affected row above (Unitree Go2 1.1.7 to <=1.1.9; Unitree Go2 1.1.11). If your build sits inside the affected range, you must patch.

Run the version check that fits your platform:


# Linux package check
dpkg -s unitree-go2 2>/dev/null | grep -i ^Version
rpm -q unitree-go2 2>/dev/null
command -v unitree-go2 >/dev/null && unitree-go2 --version 2>/dev/null


# Windows (PowerShell)
Get-Package -Name "*Unitree Go2*" -ErrorAction SilentlyContinue | Select-Object Name, Version
winget list --name "Unitree Go2" 2>$null

How to fix CVE-2026-27509

Upgrade Unitree Go2 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 unitree-go2
dpkg -s unitree-go2 | grep -i ^Version

RHEL / CentOS / Rocky / AlmaLinux


sudo dnf upgrade --refresh unitree-go2 -y
# or for older releases:
sudo yum update unitree-go2 -y
rpm -q unitree-go2

SUSE / openSUSE


sudo zypper refresh
sudo zypper update unitree-go2
rpm -q unitree-go2

Node.js / npm


# Update the affected package in your project
npm install Unitree Go2@latest
npm ls Unitree Go2
npm audit fix

Python / pip


pip install --upgrade unitree-go2
pip show unitree-go2 | grep -i version

Complete PowerShell remediation script (Windows)


# Fix script for CVE-2026-27509 affecting Unitree Go2
# Run as administrator. Detect -> backup -> upgrade -> verify -> log.

$ErrorActionPreference = "Stop"
$LogPath  = "C:\Logs\CVE-2026-27509-fix-$(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"
    $pkg = Get-Package -Name "*Unitree Go2*" -ErrorAction SilentlyContinue
    if ($pkg) { $pkg | Format-Table Name, Version }
    else { Write-Host "Not detected via Get-Package; try winget list" }

    Write-Host "[2/4] Backup configuration"
    $backup = "C:\Backup\unitree-go2-$(Get-Date -Format yyyyMMdd)"
    New-Item -ItemType Directory -Force $backup | Out-Null
    Get-ChildItem "C:\ProgramData\Unitree Go2" -ErrorAction SilentlyContinue |
        Copy-Item -Destination $backup -Recurse -Force -ErrorAction SilentlyContinue

    Write-Host "[3/4] Apply the upgrade to See vendor advisory"
    winget upgrade --name "Unitree Go2" --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 "Unitree Go2"
    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-2026-27509 affecting Unitree Go2
# Detect -> backup -> upgrade -> verify -> log.

set -euo pipefail
LOG="/var/log/cve-2026-27509-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 unitree-go2 2>/dev/null | grep -i ^Version || echo "unitree-go2 not installed via dpkg"
elif command -v rpm >/dev/null; then
    rpm -q unitree-go2 || echo "unitree-go2 not installed via rpm"
fi

echo "[2/4] Backup configuration"
BACKUP="/root/backup-cve-2026-27509-$(date +%Y%m%d)"
mkdir -p "$BACKUP"
for d in /etc/unitree-go2 /etc/unitree-go2.d /etc/unitree-go2.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 unitree-go2
elif command -v dnf >/dev/null; then
    dnf upgrade --refresh -y unitree-go2
elif command -v yum >/dev/null; then
    yum update -y unitree-go2
elif command -v zypper >/dev/null; then
    zypper --non-interactive update unitree-go2
fi

echo "[4/4] Verify the patched build"
if command -v dpkg >/dev/null; then
    dpkg -s unitree-go2 2>/dev/null | grep -i ^Version
elif command -v rpm >/dev/null; then
    rpm -q unitree-go2
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-2026-27509" -Direction Inbound -Action Block -Protocol TCP -LocalPort 80,443 -RemoteAddress Any -Enabled True
Get-NetFirewallRule -DisplayName "Block-CVE-2026-27509"

Disable the affected service (Linux)


sudo systemctl stop unitree-go2 2>/dev/null || true
sudo systemctl disable unitree-go2 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 unitree-go2 2>/dev/null | grep -i ^Version
rpm -q unitree-go2 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 "*Unitree Go2*" | 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.

Frequently asked questions

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Is CVE-2026-27509 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-2026-27509?

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-2026-27509?

8.5 (High). Vector: CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N.

Where is the official advisory for CVE-2026-27509?

The vendor advisory is at https://boschko.ca/unitree-go2-rce/. The NVD record is at https://nvd.nist.gov/vuln/detail/CVE-2026-27509.

References

Official vendor advisory: https://boschko.ca/unitree-go2-rce/
NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-27509
CISA KEV catalog: https://www.cisa.gov/known-exploited-vulnerabilities-catalog
Additional reference: https://shop.unitree.com/products/unitree-go2
Additional reference: https://www.vulncheck.com/advisories/unitree-go2-missing-dds-authentication-enables-adjacent-rce

*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.*