High severity · published Sep 8, 2026
CVE-2026-78456
SQL Server Remote Code Execution Vulnerability
8.8
CVSS
0.9%
EPSS
No
On KEV
Description
Heap-based buffer overflow in SQL Server allows an authorized attacker to execute code over a network.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.9% · higher than 60% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
MS
Microsoft SQL Server 2022 (CU 26) · Microsoft
16.0.0.0 before 16.0.4275.2 · source: vendor
MS
Microsoft SQL Server 2022 (GDR) · Microsoft
16.0.0 before 16.0.1200.5 · source: vendor
SS
Sql Server 2022 · Microsoft
before 16.0.1200.5; 16.0.4003.1 before 16.0.4275.2 · source: NVD
Affected product
MS
Microsoft SQL Server 2022 (CU 26)
Microsoft
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-78456
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-78456
vendor-advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-78456
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