CVE-2026-78442: CWE-122: Heap-based Buffer Overflow in Microsoft Microsoft SQL Server 2017 (CU 31)
Description
Heap-based buffer overflow in Windows OLE DB allows an unauthorized attacker to execute code over a network.
CVSS v3.1
Score 8.8high
Affected software
Microsoft
Microsoft SQL Server 2017 (CU 31)
Microsoft
Microsoft SQL Server 2017 (GDR)
Microsoft
Microsoft SQL Server 2019 (CU 32)
Microsoft
Microsoft SQL Server 2019 (GDR)
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CVE-2026-78442) involves a heap-based buffer overflow in the Windows OLE DB component used by Microsoft SQL Server 2017 (CU 31). Exploitation could allow an attacker without privileges to execute arbitrary code remotely. The CVSS 3.1 score is 8.8, indicating high impact on confidentiality, integrity, and availability. Microsoft has published an official fix for affected versions. No known exploits are reported in the wild at this time.
Potential Impact
Successful exploitation could lead to remote code execution by an unauthorized attacker, compromising system confidentiality, integrity, and availability. This poses a significant risk to affected SQL Server installations prior to the fixed versions.
Mitigation Recommendations
An official fix is available from Microsoft. Users should apply the security update provided in the Microsoft advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-78442 to remediate this vulnerability.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2026-08-24T16:21:50.286Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-78442","vendor":"Microsoft"}]
Threat ID: 6aa0455eacd9273b49faa0f3
Added to database: 09/08/2026, 17:26:54 UTC
Last enriched: 10/14/2026, 21:59:47 UTC
Last updated: 10/22/2026, 01:15:26 UTC
Views: 28
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