CVE-2026-94520
Microsoft SQL Server Denial of Service Vulnerability
Use of externally-controlled format string in SQL Server allows an authorized attacker to deny service over a network.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- High
- User interaction
- None
What an attacker can affect
- Confidentiality
- None
- Integrity
- None
- Availability
- High
Exploit likelihood
What each source reports
CVE List Score used
Microsoft SQL Server Denial of Service Vulnerability
Use of externally-controlled format string in SQL Server allows an authorized attacker to deny service over a network.
- Record
CVE-2026-94520- CVSS 3.1
- 4.9 Medium
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C - Weakness
- CWE-134
- Updated
- 2026-11-02
EUVDEUVD-2026-100620
Use of externally-controlled format string in SQL Server allows an authorized attacker to deny service over a network.
- Record
EUVD-2026-100620- CVSS 3.1
- 4.9 Medium
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-vxwq-jqhm-w2r6
Use of externally-controlled format string in SQL Server allows an authorized attacker to deny...
Use of externally-controlled format string in SQL Server allows an authorized attacker to deny service over a network.
- Record
GHSA-vxwq-jqhm-w2r6- CVSS 3.1
- 4.9 Medium
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H - Weakness
- CWE-134
- Updated
- 2026-11-02
NVD
Use of externally-controlled format string in SQL Server allows an authorized attacker to deny service over a network.
- Record
CVE-2026-94520- CVSS 3.1
- 4.9 Medium
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H - Weakness
- CWE-134
- Updated
- 2026-11-02
Affected products
- microsoft sql server 2017 (gdr)
- microsoft sql server 2017 for x64-based systems (cu31)
- microsoft sql server 2019 (gdr)
- microsoft sql server 2019 for x64-based systems (cu32)
- microsoft sql server 2022 (gdr)
- microsoft sql server 2022 for x64-based systems (cu27)
- microsoft sql server 2025 for x64-based systems (cu9)
- microsoft sql server 2025 for x64-based systems (gdr)
History
| Recorded | Changed | Sources |
|---|---|---|
| first indexed | CVE List, EUVD, GitHub Advisories, NVD |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2026-94520 is a medium vulnerability (CVSS 4.9) in Microsoft Sql Server 2017 (gdr), published October 13, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.84%, the 58th percentile. No source names a fixed version.