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Severe, 6 weeks1496Projects326

1496 severe, 6 weeks · 326 projects

MicrosoftCVE-2026-78456

Microsoft SQL Server: heap buffer overflow

Microsoft

CVE-2026-78456 · Published Sep 8, 2026 · updated Sep 15, 2026

High8.8
Fix: upgrade to 16.0.4275.2 or later (2 fixed versions below)
Microsoft advisory

Heap-based buffer overflow in SQL Server allows an authorized attacker to execute code over a network.

Affected versions

PackageAffectedFixed in
Microsoft SQL Server 2022 (CU 26)
Product
>= 16.0.0.0, < 16.0.4275.216.0.4275.2
Microsoft SQL Server 2022 (GDR)
Product
>= 16.0.0, < 16.0.1200.516.0.1200.5
Details and references
CVSS 3.1
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Severity from
the vendor (its own CVE record or advisory)
Weakness
CWE-122

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