CVE-2026-54124: Integer overflow or wraparound in Windows Terminal allows an unauthorized attacker to execute code locally.
42
This month
HIGH 7.8WATCHLISTUPGRADEUPGRADEUPGRADE
CVE-2026-54124 is a high-severity flaw (CVSS 7.8) affecting terminal, windows 10 21h2, windows 10 22h2. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
Integer overflow or wraparound in Windows Terminal allows an unauthorized attacker to execute code locally.
Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.
microsoft windows 10 21h2 UPGRADE
Affected: < 10.0.19044.7548
Fixed in: 10.0.19044.7548
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: < 10.0.19045.7548
Fixed in: 10.0.19045.7548
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: < 10.0.26100.8875
Fixed in: 10.0.26100.8875
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 25h2 UPGRADE
Affected: < 10.0.26200.8875
Fixed in: 10.0.26200.8875
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 26h1 UPGRADE
Affected: < 10.0.28000.2269 · < 10.0.28000.2525
Fixed in: 10.0.28000.2269, 10.0.28000.2525
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.
Verify at the official sourceNVD · 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.
Quick answers
How do I fix CVE-2026-54124?
terminal: upgrade to 1.24.11321.0; windows 10 21h2: upgrade to 10.0.19044.7548; windows 10 22h2: upgrade to 10.0.19045.7548. Exact commands for each OS are on this page.
Is CVE-2026-54124 being exploited?
CVE-2026-54124 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-2026-54124 affect?
CVE-2026-54124 affects terminal, windows 10 21h2, windows 10 22h2. Severity is high (CVSS 7.8). Integer overflow or wraparound in Windows Terminal allows an unauthorized attacker to execute code locally.
PatchTheCVE