EUVD-2026-73386
GHSA-ghg4-3wxm-cgjx
Severity by source
AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Network-reachable heap overflow requiring only a low-privilege database login; successful exploitation yields full process-level code execution warranting C:H/I:H/A:H.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
4DescriptionCVE.org
Heap-based buffer overflow in SQL Server allows an authorized attacker to execute code over a network.
AnalysisAI
Remote code execution in Microsoft SQL Server 2025 is achievable by a network-authenticated attacker exploiting a heap-based buffer overflow in the database engine. The flaw (CWE-122) affects both the GDR and CU8 cumulative update branches of SQL Server 2025, requires only a low-privilege database login (PR:L per CVSS), and yields full confidentiality, integrity, and availability impact upon successful exploitation. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires a valid SQL Server login with at least low-privilege access to the target SQL Server 2025 instance, as indicated by the PR:L metric in the CVSS vector; any standard database login (application account, read-only reporting user, etc.) satisfies this threshold. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 8.8 vector (AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H) is well-calibrated: the flaw is network-reachable at low attack complexity, requiring only a valid database login, with full confidentiality, integrity, and availability impact on the SQL Server process. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Apply Microsoft's released patches without delay: upgrade GDR branch installations to version 17.0.1135.8 or later, and CU8 branch installations to version 17.0.4085.5 or later, per the MSRC advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-67638. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, conduct a complete inventory of all Microsoft SQL Server 2025 instances and identify systems processing sensitive data or supporting critical business operations. …
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Same weakness CWE-122 – Heap-based Buffer Overflow
View allSame technique Buffer Overflow
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External POC / Exploit Code
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