CVE-2026-67373: Heap-based buffer overflow in SQL Server allows an authorized attacker to execute code over a network.

This month

HIGH 8.8WATCHLISTUPGRADE

CVE-2026-67373 is a high-severity flaw (CVSS 8.8) affecting sql server 2025. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Heap-based buffer overflow in SQL Server allows an authorized 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	Low
User interaction	None
EPSS exploit chance	0.9% (top 40%)
CISA exploited list	No
Weakness	CWE-122
Published	2026-09-08
Last modified	2026-09-16

Publisher (CNA): Microsoft Corporation · Vendor: microsoft

Last updated 2026-09-16 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-09-08 18:18 UTCPublished CVE record published
2026-09-16 12:02 UTCUpdated Record last modified

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.

Quick answers

How do I fix CVE-2026-67373?

sql server 2025: upgrade to 17.0.1135.8, 17.0.4085.5. Exact commands for each OS are on this page.

Is CVE-2026-67373 being exploited?

CVE-2026-67373 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-2026-67373 affect?

CVE-2026-67373 affects sql server 2025. Severity is high (CVSS 8.8). Heap-based buffer overflow in SQL Server allows an authorized attacker to execute code over a network.

How urgent is CVE-2026-67373?

Priority 51/100. 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-2026-67630 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.
CVE-2026-67624 MEDIUM 6.5 UPGRADE UPGRADE Out-of-bounds read in SQL Server allows an authorized attacker to disclose information over a network.

References

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