CVE-2026-78456: CWE-122: Heap-based Buffer Overflow in Microsoft Microsoft SQL Server 2022 (CU 26)
Description
Heap-based buffer overflow in SQL Server allows an authorized attacker to execute code over a network.
CVSS v3.1
Score 8.8high
Affected software
Microsoft
Microsoft SQL Server 2022 (CU 26)
Microsoft
Microsoft SQL Server 2022 (GDR)
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Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CWE-122) involves a heap-based buffer overflow in Microsoft SQL Server 2022 (CU 26). An attacker with authorized access can exploit this flaw remotely to execute arbitrary code on the affected system. The vulnerability affects versions >=16.0.0.0 and <16.0.4275.2, as well as >=16.0.0 and <16.0.1200.5, including exactly version 16.0.0.0. Microsoft has published an official fix to address this issue.
Potential Impact
Successful exploitation allows an authorized attacker to execute arbitrary code remotely, potentially leading to full compromise of the affected SQL Server instance. The vulnerability impacts confidentiality, integrity, and availability with high severity.
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-2026-78456 to remediate this vulnerability.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2026-08-24T16:21:50.287Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-78456","vendor":"Microsoft"}]
Threat ID: 6aa04561acd9273b49faa1b3
Added to database: 09/08/2026, 17:26:57 UTC
Last enriched: 10/14/2026, 22:01:02 UTC
Last updated: 10/24/2026, 03:05:11 UTC
Views: 33
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