Security October 2026 CVE-2026-83945
Heap-based buffer overflow in SQL Server allows an authorized attacker to execute code over a network.
Severity Important
CVSS base score 6.6CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
Impact Remote Code Execution
EPSS, next 30 days 0.6% Higher than 46.3% of scored CVEs · FIRST model run 25 Oct 2026 · about EPSS
Public exploit code No Nuclei template lists it
Exploitability Exploitation Unlikely
Publicly disclosed No
Customer action Required: apply the update
Component SQL Server
Weakness CWE-122: Heap-based Buffer Overflow
Issued by Microsoft
Last revised 13 Oct 2026 CVSS 3.1 base metrics Red raises the risk · green lowers it
Attack vector NetworkAV:N
Attack complexity HighAC:H
Privileges required HighPR:H
User interaction NoneUI:N
Scope UnchangedS:U
Confidentiality HighC:H
Integrity HighI:H
Availability HighA:H Source. This summary comes from MSRC's public CVRF document for October 2026. If the MSRC page is blocked in your browser, the NVD and CVE.org records carry the same identifier. None of this says whether your devices are affected.
Explore global source statements, affected packages and advisory history for CVE-2026-83945 . The catalog has a separate collection scope from Microsoft release records.
Overview Affected History Connections
cve-program · CVE-2026-83945 Published Microsoft SQL Server 2022 (GDR) Vendor product
Original vendor version evidence · not evaluated as a NuGet range {
"vendor": "Microsoft",
"product": "Microsoft SQL Server 2022 (GDR)",
"platforms": [
"x64-based Systems"
],
"versions": [
{
"version": "16.0.0",
"lessThan": "16.0.1210.3",
"versionType": "custom",
"status": "affected"
}
]
} Microsoft SQL Server 2022 for x64-based Systems (CU27) Vendor product
Original vendor version evidence · not evaluated as a NuGet range {
"vendor": "Microsoft",
"product": "Microsoft SQL Server 2022 for x64-based Systems (CU27)",
"platforms": [
"x64-based Systems"
],
"versions": [
{
"version": "16.0.4003.1",
"lessThan": "16.0.4305.5",
"versionType": "custom",
"status": "affected"
}
]
} Microsoft SQL Server 2025 (CU8) Vendor product
Original vendor version evidence · not evaluated as a NuGet range {
"vendor": "Microsoft",
"product": "Microsoft SQL Server 2025 (CU8)",
"platforms": [
"x64-based Systems"
],
"versions": [
{
"version": "-",
"status": "affected"
}
]
} Microsoft SQL Server 2025 for x64-based Systems (CU9) Vendor product
Original vendor version evidence · not evaluated as a NuGet range {
"vendor": "Microsoft",
"product": "Microsoft SQL Server 2025 for x64-based Systems (CU9)",
"platforms": [
"x64-based Systems"
],
"versions": [
{
"version": "17.0.4006.2",
"lessThan": "17.0.5015.4",
"versionType": "custom",
"status": "affected"
}
]
} Microsoft SQL Server 2025 for x64-based Systems (GDR) Vendor product
Original vendor version evidence · not evaluated as a NuGet range {
"vendor": "Microsoft",
"product": "Microsoft SQL Server 2025 for x64-based Systems (GDR)",
"platforms": [
"x64-based Systems"
],
"versions": [
{
"version": "17.0.1050.2",
"lessThan": "17.0.1145.4",
"versionType": "custom",
"status": "affected"
}
]
}