PatchTheCVECVE-2026-100218: Use after free in Remote Desktop Gateway Service allows an unauthorized attacker to execute code over a networ
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HIGH 8.1REMOTEWATCHLISTUPGRADEUPGRADEUPGRADE
CVE-2026-100218 is a high-severity flaw (CVSS 8.1) affecting windows 10 1607, windows 10 1809, windows 10 21h2. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
Use after free in Remote Desktop Gateway Service allows an unauthorized attacker to execute code over a network.
Why this priority
- High severity
- Remotely exploitable, no login, no user action
- On your watchlist
A fixed release or distro patch exists.
Risk facts
| CVSS score | 8.1 (High) |
| Attack vector | Network (remote) |
| Attack complexity | High |
| Privileges needed | None |
| User interaction | None |
| EPSS exploit chance | 0.8% (top 43%) |
| CISA exploited list | No |
| Weakness | CWE-416 |
| Published | 2026-10-13 |
| Last modified | 2026-10-20 |
Publisher (CNA): Microsoft Corporation · Vendor: microsoft
Last updated 2026-10-20 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
microsoft windows 10 1607 UPGRADE
Affected: < 10.0.14393.9612
Fixed in: 10.0.14393.9612
Safe to downgrade to: no unaffected older release
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
microsoft windows 10 1809 UPGRADE
Affected: < 10.0.17763.9376
Fixed in: 10.0.17763.9376
Safe to downgrade to: no unaffected older release
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
microsoft windows 10 21h2 UPGRADE
Affected: < 10.0.19044.7807
Fixed in: 10.0.19044.7807
Safe to downgrade to: no unaffected older release
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
microsoft windows 10 22h2 UPGRADE
Affected: < 10.0.19045.7807
Fixed in: 10.0.19045.7807
Safe to downgrade to: no unaffected older release
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
microsoft windows 11 23h2 UPGRADE
Affected: < 10.0.22631.7652
Fixed in: 10.0.22631.7652
Safe to downgrade to: no unaffected older release
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
microsoft windows 11 24h2 UPGRADE
Affected: < 10.0.26100.9711
Fixed in: 10.0.26100.9711
Safe to downgrade to: no unaffected older release
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
Exact fixes by distribution
Fedora 46 · fio · FIXED · 3.43-2.fc46 · FEDORA-2026-b36219886b · source
sudo dnf upgrade --advisory=FEDORA-2026-b36219886b
Fedora ELN · weston · FIXED · 16.0.2-1.eln159 · FEDORA-2026-b98ccaa6a0 · source
sudo dnf upgrade --advisory=FEDORA-2026-b98ccaa6a0
Windows 11 Version 25H2 for x64-based Systems · KB5127648 · FIXED · 10.0.26200.9711 · KB5127648 · source
Install KB5127648 via Windows Update, then verify:
Get-HotFix -Id KB5127648
Windows 11 Version 25H2 for ARM64-based Systems · KB5127648 · FIXED · 10.0.26200.9711 · KB5127648 · source
Install KB5127648 via Windows Update, then verify:
Get-HotFix -Id KB5127648
Windows 11 Version 26H2 for ARM64-based Systems · KB5127648 · FIXED · 10.0.26300.9711 · KB5127648 · source
Install KB5127648 via Windows Update, then verify:
Get-HotFix -Id KB5127648
Windows 11 Version 26H2 for x64-based Systems · KB5127648 · FIXED · 10.0.26300.9711 · KB5127648 · source
Install KB5127648 via Windows Update, then verify:
Get-HotFix -Id KB5127648
Install KB5126646 via Windows Update, then verify:
Get-HotFix -Id KB5126646
Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2026-100218?
windows 10 1607: upgrade to 10.0.14393.9612; windows 10 1809: upgrade to 10.0.17763.9376; windows 10 21h2: upgrade to 10.0.19044.7807. Exact commands for each OS are on this page.
Is CVE-2026-100218 being exploited?
CVE-2026-100218 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2026-100218 affect?
CVE-2026-100218 affects windows 10 1607, windows 10 1809, windows 10 21h2. Severity is high (CVSS 8.1). Use after free in Remote Desktop Gateway Service allows an unauthorized attacker to execute code over a network.
How urgent is CVE-2026-100218?
Priority 53/100. High severity; Remotely exploitable, no login, no user action; On your watchlist
Software pages
Windows vulnerabilities · WinRM and RDP vulnerabilities
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