MicrosoftCVE-2026-67643
Microsoft SQL Server: heap buffer overflow
Critical9.8CVE-2026-67643 · Published Sep 8, 2026 · updated Sep 17, 2026
Heap-based buffer overflow in SQL Server allows an unauthorized attacker to execute code over a network.
Affected versions
| Package | Affected | Fixed in |
|---|---|---|
| Microsoft SQL Server 2022 (CU 26) Product | >= 16.0.0.0, < 16.0.4275.2 | 16.0.4275.2 |
| Microsoft SQL Server 2022 (GDR) Product | >= 16.0.0, < 16.0.1200.5 | 16.0.1200.5 |
| Microsoft SQL Server 2025 (CU8) Product | >= 17.0.0.0, < 17.0.4085.5 | 17.0.4085.5 |
| Microsoft SQL Server 2025 for x64-based Systems (GDR) Product | >= 17.0.1050.2, < 17.0.1135.8 | 17.0.1135.8 |
Details and references
- CVSS 3.1
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Severity from
- the vendor (its own CVE record or advisory)
- Weakness
- CWE-122
More Microsoft advisories
All Microsoft| Date | Advisory | Severity | Fixed in |
|---|---|---|---|
| Sep 8 | Microsoft Skype for Business: spoofing | High8.3 | 6.0.9319.885+2 more |
| Sep 8 | Microsoft Skype for Business: cross-site scripting | Medium6.5 | 6.0.9319.885+2 more |
| Sep 8 | Microsoft Skype for Business: spoofing | High7.1 | 6.0.9319.885+2 more |
| Sep 8 | Microsoft Skype for Business: information disclosure | Medium6.5 | 6.0.9319.885+2 more |
| Sep 8 | Microsoft Skype for Business: integer overflow | High7.5 | 6.0.9319.885+2 more |
| Sep 8 | Microsoft Skype for Business: out-of-bounds read | Medium6.5 | 6.0.9319.885+2 more |