EUVD-2026-35730
GHSA-rx6q-px4x-v8cf
Severity by source
Sources disagree (Medium–Critical)AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
vuln.today treats the vendor’s rating as authoritative. A higher third-party CVSS (e.g. CISA-ADP) is shown for transparency but does not drive the headline severity.
CVSS VectorVendor: microsoft
Lifecycle Timeline
3DescriptionCVE.org
Use of uninitialized resource in Windows Push Notifications allows an authorized attacker to disclose information locally.
AnalysisAI
Windows Push Notifications on a broad range of Windows 10, Windows 11, and Windows Server editions leaks sensitive memory contents to locally authenticated low-privileged users through an uninitialized resource condition (CWE-908). The CVSS vector confirms local attack vector with low-privilege authentication requirement, no user interaction needed, and high confidentiality impact - meaning an attacker who has already obtained a standard user account can read residual memory data that could include tokens, credentials, or other sensitive artifacts. No public exploit code exists and no active exploitation has been identified at time of analysis; a vendor-released patch is available via Microsoft Security Response Center.
Technical ContextAI
CWE-908 (Use of Uninitialized Resource) describes a class of defect where memory or a system resource is allocated but not zeroed or otherwise initialized before being read or returned to a caller. In the Windows Push Notification Services (WNS) subsystem, which brokers push notification delivery between cloud notification services and Windows applications, a code path reads from an uninitialized buffer, exposing stale heap or stack contents from prior allocations to the calling process. Because this component runs as part of the Windows notification platform accessible to user-mode applications, a low-privileged process can interact with it without requiring elevated tokens. The affected scope spans Windows 10 from version 1607 through version 22H2, Windows 11 from 23H2 through 26H1, and Windows Server 2016 through 2025 (including Server Core variants), as confirmed by EUVD-2026-35730 and the Microsoft MSRC advisory.
RemediationAI
Apply the Microsoft security update corresponding to your Windows version as detailed in the MSRC advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-42969. The confirmed patched builds are: Windows 10 1607 and Server 2016 - 10.0.14393.9234 or later; Windows 10 1809 and Server 2019 - 10.0.17763.8880 or later; Windows 10 21H2 - 10.0.19044.7417 or later; Windows 10 22H2 - 10.0.19045.7417 or later; Windows 11 23H2 - 10.0.22631.7219 or later; Windows 11 24H2 and Server 2025 - 10.0.26100.8655 or later (Server 2025 also requires 10.0.26100.32995 per EUVD data - verify the applicable KB against your exact build); Windows 11 25H2 - 10.0.26200.8655 or later; Windows 11 26H1 - 10.0.28000.2269 or later; Windows Server 2022 - 10.0.20348.5256 or later. If immediate patching is not possible on shared-access or terminal server systems, as a compensating control restrict user account access to the Push Notifications service via AppLocker or group policy to limit exposure, though this may disrupt notification functionality for affected applications. No workaround fully eliminates the vulnerability without the patch.
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External POC / Exploit Code
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