CVE & CISA-KEV Catalog

CVE-2026-67643

CRITICAL
9.8
CVSS v3
NVD

Description

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

CWE-122Heap-based Buffer Overflow

How to fix

Remediation Available
Microsoft SQL Server 2022 for x64-based Systems (CU 26)Microsoft
Install:KB5122768Microsoft
Microsoft SQL Server 2022 for x64-based Systems (GDR)Microsoft
Install:KB5122771Microsoft
Microsoft SQL Server 2025 for x64-based Systems (CU8)Microsoft
Install:KB5122769Microsoft
Microsoft SQL Server 2025 for x64-based Systems (GDR)Microsoft
Install:KB5122770Microsoft

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Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredNone
User InteractionNone
ScopeUnchanged

Impact

ConfidentialityHigh
IntegrityHigh
AvailabilityHigh

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C

Exploit Intelligence

0.83%probability of exploitation in 30 days
56thpercentile

Moderate risk: more likely to be exploited than 56% of all known CVEs.

References

Related Vulnerabilities

Other CWE-122 (Heap-based Buffer Overflow) vulnerabilities, ordered by exploit likelihood. View all

CVESeverityCVSSEPSSExploitedFix
CVE-2015-3113Critical9.8100%KEVFix
CVE-2020-25687Medium5.987%-Fix
CVE-2009-3459High8.887%KEVFix
CVE-2021-21017High8.886%KEV-
CVE-2020-25683Medium5.986%-Fix
CVE-2023-27997Critical9.886%KEV + Ransom-

Common questions

How do I fix CVE-2026-67643?

Published advisories record a fix for 4 affected products. The "How to fix" section on this page lists the fixed version and source advisory for each one, so apply the entry matching what you actually run.

Is CVE-2026-67643 being actively exploited?

Not that we know of. CVE-2026-67643 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.83% is the estimated probability that it will be exploited in the next 30 days. That is higher than 56% of all scored CVEs.

How severe is CVE-2026-67643?

CVE-2026-67643 has a CVSS v3 base score of 9.8, rated critical. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

What does CVE-2026-67643 affect?

Published advisories record a fix for Microsoft SQL Server 2022 for x64-based Systems (CU 26) (Microsoft), Microsoft SQL Server 2022 for x64-based Systems (GDR) (Microsoft), Microsoft SQL Server 2025 for x64-based Systems (CU8) (Microsoft), Microsoft SQL Server 2025 for x64-based Systems (GDR) (Microsoft). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-09-17.