PatchTheCVECVE-2026-67641: Integer overflow or wraparound in SQL Server allows an authorized attacker to deny service over a network.
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MEDIUM 6.5WATCHLISTUPGRADEUPGRADE
CVE-2026-67641 is a medium-severity flaw (CVSS 6.5) affecting sql server 2022, sql server 2025. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
Integer overflow or wraparound in SQL Server allows an authorized attacker to deny service over a network.
Why this priority
- On your watchlist
A fixed release or distro patch exists.
Risk facts
| CVSS score | 6.5 (Medium) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | Low |
| User interaction | None |
| EPSS exploit chance | 1.1% (top 34%) |
| CISA exploited list | No |
| Weakness | CWE-190 |
| Published | 2026-09-08 |
| Last modified | 2026-09-15 |
Publisher (CNA): Microsoft Corporation · Vendor: microsoft
Last updated 2026-09-15 · 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 sql server 2022 UPGRADE
Affected: < 16.0.1200.5 · >= 16.0.4003.1 and < 16.0.4275.2
Fixed in: 16.0.1200.5, 16.0.4275.2
Safe to downgrade to: a release before 16.0.4003.1
1. Check installed version
apt-cache policy sql-server-2022 || rpm -q sql-server-2022 || sql-server-2022 --version
2. UPGRADE to 16.0.1200.5 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade sql-server-2022
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade sql-server-2022
Note
Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.
3. If no update is available yet, DOWNGRADE to a release before 16.0.4003.1 (Debian / Ubuntu)
apt-cache madison sql-server-2022
sudo apt install sql-server-2022=<VERSION_BEFORE_16.0.4003.1>
sudo apt-mark hold sql-server-2022
3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list sql-server-2022
sudo dnf downgrade sql-server-2022-<VERSION_BEFORE_16.0.4003.1>
sudo dnf versionlock add sql-server-2022
Downgrade risk
Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.
After downgrade
Restart the service, and keep the package held until a fixed release ships.
microsoft sql server 2025 UPGRADE
Affected: < 17.0.1135.8 · >= 17.0.4006.2 and < 17.0.4085.5
Fixed in: 17.0.1135.8, 17.0.4085.5
Safe to downgrade to: a release before 17.0.4006.2
1. Check installed version
apt-cache policy sql-server-2025 || rpm -q sql-server-2025 || sql-server-2025 --version
2. UPGRADE to 17.0.1135.8 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade sql-server-2025
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade sql-server-2025
Note
Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.
3. If no update is available yet, DOWNGRADE to a release before 17.0.4006.2 (Debian / Ubuntu)
apt-cache madison sql-server-2025
sudo apt install sql-server-2025=<VERSION_BEFORE_17.0.4006.2>
sudo apt-mark hold sql-server-2025
3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list sql-server-2025
sudo dnf downgrade sql-server-2025-<VERSION_BEFORE_17.0.4006.2>
sudo dnf versionlock add sql-server-2025
Downgrade risk
Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.
After downgrade
Restart the service, and keep the package held until a fixed release ships.
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-2026-67641?
sql server 2022: upgrade to 16.0.1200.5, 16.0.4275.2; sql server 2025: upgrade to 17.0.1135.8, 17.0.4085.5. Exact commands for each OS are on this page.
Is CVE-2026-67641 being exploited?
CVE-2026-67641 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-2026-67641 affect?
CVE-2026-67641 affects sql server 2022, sql server 2025. Severity is medium (CVSS 6.5). Integer overflow or wraparound in SQL Server allows an authorized attacker to deny service over a network.
How urgent is CVE-2026-67641?
Priority 44/100. On your watchlist
Software pages
Microsoft SQL Server vulnerabilities
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