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CVE-2026-67643

9.8 CRITICALEPSS 0.83%
  1. Published8 Sept 2026

Description

Heap-based buffer overflow in SQL Server allows an unauthorized attacker to execute code over a network.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

Microsoft Sql Server 2022≥ 16.0.4003.1 < 16.0.4275.2 · < 16.0.1200.5
Microsoft Sql Server 2025≥ 17.0.4006.2 < 17.0.4085.5 · < 17.0.1135.8

Remediation

Fixed in
Microsoft Sql Server 2022≥ 16.0.4275.2
Microsoft Sql Server 2025≥ 17.0.4085.5

References

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Frequently asked

Is CVE-2026-67643 being actively exploited?

CVE-2026-67643 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.83%.

How severe is CVE-2026-67643?

CVE-2026-67643 has a CVSS 3.1 base score of 9.8, rated critical. EPSS estimates a 0.83% probability of exploitation.

Which products are affected by CVE-2026-67643?

Affected products include Microsoft Sql Server 2022, Microsoft Sql Server 2025.

How do I fix CVE-2026-67643?

Upgrade affected software to a fixed version, for example Microsoft Sql Server 2022 16.0.4275.2, Microsoft Sql Server 2025 17.0.4085.5 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-67643 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.