CVE-2026-77484 Microsoft SQL Server Remote Code Execution Vulnerability
An authorized attacker can execute arbitrary code remotely via unsafe deserialization in Microsoft SQL Server.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-77484?
CVE-2026-77484 is a high-severity unsafe deserialization vulnerability in Microsoft Sql Server 2019, published on 8 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Deserialization of untrusted data in SQL Server allows an authorized attacker to execute code over a network.
Weakness: CWE-502
Which versions are affected by CVE-2026-77484?
It affects 3 products.
Products include Microsoft Sql Server 2019, Microsoft Sql Server 2022, Microsoft Sql Server 2025.
How do I fix CVE-2026-77484?
No fix has been published for CVE-2026-77484 yet. Limit exposure of the affected software until one is available.
Upgrade, and only deserialise data from trusted sources or with an allow-list of types. More about Unsafe deserialization.
Is CVE-2026-77484 being exploited?
There is no known exploitation of CVE-2026-77484 in the wild and no public exploit code.
Other vulnerabilities in Microsoft Sql Server 2019
- CVE-2026-67378 Microsoft SQL Server Remote Code Execution Vulnerability
- CVE-2026-67636 Microsoft SQL Server Remote Code Execution Vulnerability
- CVE-2024-29047 Microsoft OLE DB Driver for SQL Server Remote Code Execution Vulnerability
- CVE-2026-67379 Microsoft SQL Server Remote Code Execution Vulnerability
- CVE-2025-49717 Microsoft SQL Server Remote Code Execution Vulnerability
Sources
Also known as GHSA-9c53-qmh3-jjjf.