CVE-2026-77486: Integer overflow or wraparound in SQL Server allows an unauthorized attacker to execute code over a network.

This month

HIGH 8.8WATCHLISTUPGRADEUPGRADE

CVE-2026-77486 is a high-severity flaw (CVSS 8.8) affecting sql server 2017, sql server 2019. 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 unauthorized attacker to execute code over a network.

Why this priority

High severity
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	8.8 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.8% (top 43%)
CISA exploited list	No
Weakness	CWE-122, 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

2026-09-08 18:20 UTCPublished CVE record published
2026-09-15 15:44 UTCUpdated Record last modified

microsoft sql server 2017 UPGRADE

Affected: < 14.0.2130.4 · >= 14.0.3006.16 and < 14.0.3550.4

Fixed in: 14.0.2130.4, 14.0.3550.4

Safe to downgrade to: a release before 14.0.3006.16

1. Check installed version

apt-cache policy sql-server-2017 || rpm -q sql-server-2017 || sql-server-2017 --version

2. UPGRADE to 14.0.2130.4 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade sql-server-2017

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade sql-server-2017

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 14.0.3006.16 (Debian / Ubuntu)

apt-cache madison sql-server-2017 sudo apt install sql-server-2017=<VERSION_BEFORE_14.0.3006.16> sudo apt-mark hold sql-server-2017

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list sql-server-2017 sudo dnf downgrade sql-server-2017-<VERSION_BEFORE_14.0.3006.16> sudo dnf versionlock add sql-server-2017

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 2019 UPGRADE

Affected: < 15.0.2190.7 · >= 15.0.4003.23 and < 15.0.4490.9

Fixed in: 15.0.2190.7, 15.0.4490.9

Safe to downgrade to: a release before 15.0.4003.23

1. Check installed version

apt-cache policy sql-server-2019 || rpm -q sql-server-2019 || sql-server-2019 --version

2. UPGRADE to 15.0.2190.7 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade sql-server-2019

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade sql-server-2019

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 15.0.4003.23 (Debian / Ubuntu)

apt-cache madison sql-server-2019 sudo apt install sql-server-2019=<VERSION_BEFORE_15.0.4003.23> sudo apt-mark hold sql-server-2019

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list sql-server-2019 sudo dnf downgrade sql-server-2019-<VERSION_BEFORE_15.0.4003.23> sudo dnf versionlock add sql-server-2019

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.

Quick answers

How do I fix CVE-2026-77486?

sql server 2017: upgrade to 14.0.2130.4, 14.0.3550.4; sql server 2019: upgrade to 15.0.2190.7, 15.0.4490.9. Exact commands for each OS are on this page.

Is CVE-2026-77486 being exploited?

CVE-2026-77486 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-2026-77486 affect?

CVE-2026-77486 affects sql server 2017, sql server 2019. Severity is high (CVSS 8.8). Integer overflow or wraparound in SQL Server allows an unauthorized attacker to execute code over a network.

How urgent is CVE-2026-77486?

Priority 50/100. High severity; On your watchlist

Software pages

Microsoft SQL Server vulnerabilities

Related CVEs

CVE-2026-40370 HIGH 8.8 UPGRADE UPGRADE External control of file name or path in SQL Server allows an authorized attacker to execute code over a netwo
CVE-2026-32167 MEDIUM 6.7 UPGRADE UPGRADE Improper neutralization of special elements used in an sql command ('sql injection') in SQL Server allows an a
CVE-2026-69562 MEDIUM 6.5 UPGRADE UPGRADE Out-of-bounds read in SQL Server allows an unauthorized attacker to disclose information over a network.
CVE-2026-67630 MEDIUM 6.5 UPGRADE UPGRADE Out-of-bounds read in SQL Server allows an authorized attacker to disclose information over a network.
CVE-2026-67629 MEDIUM 6.5 UPGRADE UPGRADE Out-of-bounds read in SQL Server allows an authorized attacker to disclose information over a network.

References

← Back to latest CVEs