Vulnerability · Published Sep 8, 2026 · Assigned by microsoft
CVE-2026-67643Microsoft SQL Server Remote Code Execution Vulnerability
Critical 9.8
In plain English
A critical-severity heap buffer overflow in Microsoft SQL Server 2022 (CU 26) from Microsoft. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.0% (higher than 62% of all known vulnerabilities).
Severity (CVSS 3.1)9.8Critical
Exploit odds (30 days)1.0%top 37.8% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
Heap-based buffer overflow in SQL Server allows an unauthorized attacker to execute code over a network.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Microsoft | Microsoft SQL Server 2022 (CU 26) | 16.0.0.0 – before 16.0.4275.2 |
| Microsoft | Microsoft SQL Server 2022 (GDR) | 16.0.0 – before 16.0.1200.5 |
| Microsoft | Microsoft SQL Server 2025 (CU8) | 17.0.0.0 – before 17.0.4085.5 |
| Microsoft | Microsoft SQL Server 2025 for x64-based Systems (GDR) | 17.0.1050.2 – before 17.0.1135.8 |
Weakness: CWE-122 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
References
- Microsoft SQL Server Remote Code Execution Vulnerability vendor-advisory, patch