CVE-2026-83945ImportantRCENetwork

Microsoft SQL Server Remote Code Execution Vulnerability

MSRC advisory NVD CVE.org

Assessment

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
Published: 13 Oct 2026 · October 2026
Last revised: 13 Oct 2026

CVSS 3.1 base metricsRed 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

Updates that fix it

4 KBs

KB	Type	Restart	Applies to	Other CVEs
KB5126934	Security Update	Required	Microsoft SQL Server 2022 for x64-based Systems (CU27)	All CVEs in KB5126934
KB5126967	Security Update	Required	Microsoft SQL Server 2025 for x64-based Systems (CU9)	All CVEs in KB5126967
KB5128492	Security Update	Required	Microsoft SQL Server 2025 for x64-based Systems (GDR)	All CVEs in KB5128492
KB5128493	Security Update	Required	Microsoft SQL Server 2022 for x64-based Systems (GDR)	All CVEs in KB5128493

Affected products

SQL Server

5 affected products

What changed

First observed 14 Oct 2026

25 Oct 2026 · 17:12:51 UTC EPSS0.4%; scored 24 Oct 2026 → 0.6%; scored 25 Oct 2026
25 Oct 2026 · 01:34:18 UTC EPSS0.4%; scored 23 Oct 2026 → 0.4%; scored 24 Oct 2026
23 Oct 2026 · 15:51:28 UTC EPSS0.4%; scored 22 Oct 2026 → 0.4%; scored 23 Oct 2026
23 Oct 2026 · 09:33:49 UTC Public exploit codeUnknown: exploit-code evidence is incomplete or retained → No Nuclei template listed
23 Oct 2026 · 09:33:49 UTC CISA KEVUnknown: catalog evidence is incomplete or retained → Not listed in the collected catalog
23 Oct 2026 · 09:33:49 UTC Source coverage: public-exploit-codeIncomplete → Current
23 Oct 2026 · 09:33:49 UTC Source coverage: first-epssIncomplete → Current
23 Oct 2026 · 09:33:49 UTC Source coverage: cisa-kevIncomplete → Current
23 Oct 2026 · 09:33:49 UTC Source coverage: msrc-cvrfIncomplete → Current
23 Oct 2026 · 08:31:50 UTC Public exploit codeNo Nuclei template listed → Unknown: exploit-code evidence is incomplete or retained
23 Oct 2026 · 08:31:50 UTC CISA KEVNot listed in the collected catalog → Unknown: catalog evidence is incomplete or retained
23 Oct 2026 · 08:31:50 UTC Source coverage: public-exploit-codeCurrent → Incomplete

Show 12 more recent changes

23 Oct 2026 · 08:31:50 UTCSource coverage: first-epss Current → Incomplete
23 Oct 2026 · 08:31:50 UTCSource coverage: cisa-kev Current → Incomplete
23 Oct 2026 · 08:31:50 UTCSource coverage: msrc-cvrf Current → Incomplete
22 Oct 2026 · 17:33:15 UTCEPSS 0.4%; scored 21 Oct 2026 → 0.4%; scored 22 Oct 2026
21 Oct 2026 · 21:47:24 UTCEPSS 0.4%; scored 20 Oct 2026 → 0.4%; scored 21 Oct 2026
20 Oct 2026 · 20:53:31 UTCEPSS 0.4%; scored 19 Oct 2026 → 0.4%; scored 20 Oct 2026
19 Oct 2026 · 15:12:40 UTCEPSS 0.4%; scored 18 Oct 2026 → 0.4%; scored 19 Oct 2026
18 Oct 2026 · 14:54:30 UTCEPSS 0.4%; scored 16 Oct 2026 → 0.4%; scored 18 Oct 2026
18 Oct 2026 · 14:54:30 UTCLink: October 2026 → /security?release=2026-Oct#cves
16 Oct 2026 · 16:13:25 UTCEPSS 0.4%; scored 15 Oct 2026 → 0.4%; scored 16 Oct 2026
15 Oct 2026 · 21:30:54 UTCEPSS 0.4%; scored 14 Oct 2026 → 0.4%; scored 15 Oct 2026
15 Oct 2026 · 01:07:54 UTCEPSS Not scored → 0.4%; scored 14 Oct 2026

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Collected exploitation and prediction evidence

Risk source coverage

CISA KEV is observed exploitation evidence. FIRST EPSS is a dated prediction of exploitation in the next 30 days. Missing scores are unknown. This collector requests predictions only for explicit CVE aliases in the public NuGet archive; Microsoft release views retain their existing prediction scope.

No collected risk observation for these identifiers. This does not establish absence of exploitation or a zero probability.

cve-program · CVE-2026-83945

Published

Microsoft SQL Server Remote Code Execution Vulnerability

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

Source published: 13 Oct 2026 20:36:36 UTC
Source modified: 25 Oct 2026 18:42:29 UTC
Observed here: 25 Oct 2026 20:02:02 UTC
Source terms: CVE Program Terms of Use

Original source record · Cite this exact observation · Complete original publisher JSON

This view projects the publisher's source fields for reading; the original JSON retains additional fields and CVE enrichment containers. Attribution: cve-program · CVE Program Terms of Use. Source text is retained; field grouping and change labels are provided by ChangeIntel.

CVSS 3.1 · 6.6 CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C