CVE-2026-78456: CWE-122: Heap-based Buffer Overflow in Microsoft Microsoft SQL Server 2022 (CU 26)
Heap-based buffer overflow in SQL Server allows an authorized attacker to execute code over a network.
AI Analysis
Technical Summary
This vulnerability (CVE-2026-78456) involves a heap-based buffer overflow in Microsoft SQL Server 2022 (CU 26). It enables an attacker with authorized access to execute arbitrary code remotely over the network. The flaw is classified under CWE-122 (Heap-based Buffer Overflow). The vulnerability has a CVSS 3.1 base score of 8.8, indicating high impact on confidentiality, integrity, and availability. Microsoft has published an official fix for this issue.
Potential Impact
Successful exploitation of this vulnerability allows an authorized attacker to execute arbitrary code remotely on the affected SQL Server instance. This can lead to full compromise of the database server, including unauthorized data access, modification, or denial of service.
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.
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
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CVE-2026-78456) involves a heap-based buffer overflow in Microsoft SQL Server 2022 (CU 26). It enables an attacker with authorized access to execute arbitrary code remotely over the network. The flaw is classified under CWE-122 (Heap-based Buffer Overflow). The vulnerability has a CVSS 3.1 base score of 8.8, indicating high impact on confidentiality, integrity, and availability. Microsoft has published an official fix for this issue.
Potential Impact
Successful exploitation of this vulnerability allows an authorized attacker to execute arbitrary code remotely on the affected SQL Server instance. This can lead to full compromise of the database server, including unauthorized data access, modification, or denial of service.
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: 09/08/2026, 20:22:29 UTC
Last updated: 09/08/2026, 23:53:30 UTC
Views: 2
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