CVE-2026-78442 Windows OLE DB Remote Code Execution Vulnerability
Heap-based buffer overflow in Windows OLE DB allows remote attackers to execute arbitrary code on Microsoft SQL Server.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-78442?
CVE-2026-78442 is a high-severity memory corruption vulnerability in Microsoft Sql Server 2017, published on 8 Sep 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
Heap-based buffer overflow in Windows OLE DB allows an unauthorized attacker to execute code over a network.
Weakness: CWE-122
Which versions are affected by CVE-2026-78442?
It affects 2 products.
Products include Microsoft Sql Server 2017, Microsoft Sql Server 2019.
How do I fix CVE-2026-78442?
No fix has been published for CVE-2026-78442 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-78442 being exploited?
There is no known exploitation of CVE-2026-78442 in the wild and no public exploit code.
Other vulnerabilities in Microsoft Sql Server 2017
- CVE-2026-67631 Microsoft SQL Server Remote Code Execution Vulnerability
- CVE-2026-66814 Microsoft SQL Server Elevation of Privilege Vulnerability
- CVE-2026-66818 Microsoft SQL Server Elevation of Privilege Vulnerability
- CVE-2026-66819 Microsoft SQL Server Elevation of Privilege Vulnerability
- CVE-2026-66820 SQL Server Elevation of Privilege Vulnerability
Sources
Also known as GHSA-gvh2-qc62-c423.