EUVD-2026-56364
GHSA-mrwm-gg85-rgc3
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Local-only vector with low-privilege authorized user required; uninitialized read impacts confidentiality only, with no integrity, availability, or scope change applicable.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
3DescriptionCVE.org
Use of uninitialized resource in Windows Imaging Component allows an authorized attacker to disclose information locally.
AnalysisAI
Windows Imaging Component (WIC) across a broad span of Windows 10, Windows 11, and Windows Server releases contains an uninitialized memory read flaw (CWE-908) that an authorized local user with low privileges can exploit to disclose sensitive information from process memory. The CVSS vector (AV:L/PR:L/C:H/I:N/A:N) confirms this is strictly a local, low-privilege information disclosure with no network attack surface and no integrity or availability impact. No public exploit code has been identified and this CVE is not listed in the CISA Known Exploited Vulnerabilities catalog; a vendor-released patch is confirmed via the Microsoft MSRC advisory.
Technical ContextAI
Windows Imaging Component (WIC) is a Microsoft Windows platform subsystem that provides a unified framework for image encoding, decoding, and pixel-format conversion across formats such as JPEG, PNG, BMP, TIFF, and HEIF. The root cause is CWE-908 (Use of Uninitialized Resource): the component operates on or returns data from a memory buffer that has not been properly initialized prior to use, allowing residual contents from prior allocations in the same memory region to be surfaced to the calling process. Depending on what previously occupied that memory region, disclosed data could include cryptographic material, authentication tokens, or other sensitive in-process state. The CVSS S:U (Unchanged scope) confirms the impact is bounded within the vulnerable component's security context. Affected products span Windows Server 2012 (6.2.9200) through Windows Server 2025 (10.0.26100) and Windows 11 26H1 (10.0.28000), as enumerated in EUVD-2026-56364, indicating the flaw is present across a long-lived code path shared across generations of the Windows imaging stack.
RemediationAI
Apply the vendor-released security updates documented in the Microsoft Security Response Center advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-62740. Patched builds confirmed by EUVD-2026-56364 are: Windows Server 2025 at 10.0.26100.33296; Windows 11 24H2 at 10.0.26100.9168; Windows 11 25H2 at 10.0.26200.9168; Windows 11 26H1 at 10.0.28000.2704; Windows 11 23H2 at 10.0.22631.7517; Windows 10 21H2 at 10.0.19044.7663 and 22H2 at 10.0.19045.7663; Windows Server 2022 at 10.0.20348.5499; Windows Server 2019 and Windows 10 1809 at 10.0.17763.9115; Windows Server 2016 and Windows 10 1607 at 10.0.14393.9418; Windows Server 2012 R2 at 6.3.9600.23337; and Windows Server 2012 at 6.2.9200.26279. Where immediate patching cannot be scheduled, restrict interactive local logon and Remote Desktop access to the smallest possible set of trusted, least-privilege accounts to narrow the population of potential attackers - note this does not eliminate the underlying uninitialized memory condition and should be treated as a temporary measure only. Endpoint detection tooling should be configured to alert on anomalous local image-processing API usage patterns as an additional detection layer.
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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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