EUVD-2026-56316
GHSA-f3vg-888c-qj98
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Local vector and low-privilege requirement match the description; confidentiality-only impact reflects CWE-908 memory disclosure with no integrity or availability effect.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
3DescriptionCVE.org
Use of uninitialized resource in Windows Event Logging Service allows an authorized attacker to disclose information locally.
AnalysisAI
Windows Event Logging Service on multiple Windows desktop and server versions exposes uninitialized memory contents to locally authenticated attackers via CWE-908, enabling information disclosure without elevated privileges or user interaction. The CVSS vector (AV:L/PR:L/C:H) confirms that an authorized local user can trigger the flaw to read stale memory that may contain sensitive data from other processes or OS operations. No public exploit exists and CISA SSVC rates current exploitation as none, but the breadth of affected Windows versions - spanning Server 2012 through Windows 11 26H1 - makes patch prioritization worthwhile for any environment with untrusted local users.
Technical ContextAI
CWE-908 (Use of Uninitialized Resource) occurs when code reads from memory allocations before those regions have been populated with valid data, exposing whatever bytes previously occupied that address space - potentially data from other processes, kernel structures, or prior service operations. The Windows Event Logging Service (EventLog) is a critical Windows NT service (svchost-hosted) responsible for collecting, storing, and surfacing system, application, and security event records. The affected code path within this service allocates a buffer or resource but fails to initialize it before use, allowing a caller with at least local authenticated access to observe its raw contents. The vulnerability is scoped to local execution (AV:L, S:U) meaning the Windows security boundary prevents remote triggering. CPE strings derived from EUVD data confirm affected builds span Windows NT 6.x (Server 2012/R2) through 10.x (Server 2016 through 2025, Windows 10 all active channels, Windows 11 through 26H1).
RemediationAI
Apply the Microsoft security update for CVE-2026-59137 via Windows Update, WSUS, or Microsoft Update Catalog. Fixed builds per platform: Server 2012 → 6.2.9200.26279, Server 2012 R2 → 6.3.9600.23337, Server 2016 / Windows 10 1607 → 10.0.14393.9418, Server 2019 / Windows 10 1809 → 10.0.17763.9115, Server 2022 → 10.0.20348.5499, Windows 10 21H2 → 10.0.19044.7663, Windows 10 22H2 → 10.0.19045.7663, Windows 11 23H2 → 10.0.22631.7517, Windows 11 24H2 and Server 2025 → 10.0.26100.9168 / 10.0.26100.33296, Windows 11 25H2 → 10.0.26200.9168, Windows 11 26H1 → 10.0.28000.2704. See the vendor advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-59137 for the full patch manifest. If immediate patching is not possible, a compensating control is to restrict local interactive and remote desktop logon rights to the minimum necessary set of accounts using Group Policy (User Rights Assignment: Deny log on locally / Deny log on through Remote Desktop Services). This reduces the pool of potential attackers at the cost of legitimate access for affected accounts. No known workaround eliminates the underlying uninitialized-memory defect without the patch.
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Same weakness CWE-908 – Use of Uninitialized Resource
View allSame technique Information Disclosure
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External POC / Exploit Code
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