EUVD-2026-73789
GHSA-2p2q-6jp7-fc7g
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Local access by a low-privileged authorized user; pure confidentiality impact via integer underflow memory read; no integrity or availability effect warranted.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
4DescriptionCVE.org
Integer underflow (wrap or wraparound) in SQL Server allows an authorized attacker to disclose information locally.
AnalysisAI
Integer underflow (CWE-191) in Microsoft SQL Server enables a locally authenticated, low-privileged attacker to disclose sensitive information from the database engine without requiring user interaction. Affected versions span SQL Server 2017 through the newly released SQL Server 2025 across both GDR and cumulative update servicing tracks, with Microsoft releasing fixes across all affected branches. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires an authenticated session against the SQL Server instance by an account holding at minimum a low-privileged SQL Server login or Windows account with local access - consistent with the CVSS PR:L and AV:L metrics and the description's phrase 'authorized attacker...locally.' No user interaction by a higher-privileged user is needed. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The overall real-world risk is moderate-to-low despite the C:H confidentiality impact. … 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 the vendor-released patches for the appropriate SQL Server version and servicing track as documented in the Microsoft MSRC advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-77488. … Detailed patch versions, workarounds, and compensating controls in full report. |
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Same weakness CWE-191 – Integer Underflow
View allSame technique Information Disclosure
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External POC / Exploit Code
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