EUVD-2026-56621
GHSA-wvw6-h6jw-3gp2
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Local low-privileged access required to invoke GDI; only confidentiality impact (memory disclosure) with no integrity, availability, or scope-change effect.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
3DescriptionCVE.org
Untrusted pointer dereference in Windows GDI allows an authorized attacker to disclose information locally.
AnalysisAI
Information disclosure in Windows Graphics Device Interface (GDI) via an untrusted pointer dereference exposes sensitive memory contents to a local low-privileged attacker across virtually all supported Windows client and server releases. The vulnerability (CWE-822) allows an authorized local user to trigger a controlled pointer dereference within GDI's rendering subsystem, resulting in high-impact confidentiality loss with no integrity or availability effect. No public exploit identified at time of analysis, though the breadth of affected versions - spanning Windows 10 through Windows 11 26H1 and Server 2012 through Server 2025 - makes this a broad-footprint patching concern.
Technical ContextAI
Windows GDI (Graphics Device Interface) is a core Windows subsystem responsible for rendering graphics primitives, fonts, and device contexts. CWE-822 (Untrusted Pointer Dereference) describes a class of memory-safety flaw where attacker-influenced data is used as a pointer without adequate validation, causing the process to dereference an address it should not trust. In GDI's context, a specially crafted GDI object or API call can supply a malicious pointer value that, when dereferenced, causes the kernel or GDI subsystem to read from an attacker-influenced memory address, leaking the contents of that memory back to the caller. CPE-equivalent affected products span Windows client builds from 10.0.14393 through 10.0.28000 and server builds from 6.2.9200 through 10.0.26100, as confirmed by EUVD-2026-56621. The root cause is a failure to sanitize or validate pointer values sourced from untrusted input before dereferencing them within the GDI component.
RemediationAI
The primary fix is to apply Microsoft's security update for CVE-2026-61360 as distributed through Windows Update, WSUS, or Microsoft Update Catalog, targeting the specific build thresholds listed per OS version above (e.g., Windows 11 24H2 to build 10.0.26100.9168 or later, Windows Server 2025 to build 10.0.26100.33296 or later). The vendor advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-61360 contains download links and deployment guidance. Because exploitation requires local authenticated access, compensating controls in lieu of patching include restricting interactive and remote desktop logon rights to the minimum necessary user set, auditing local account privileges to remove unnecessary low-privileged accounts, and monitoring for anomalous GDI-related API calls via endpoint detection tooling - noting these controls reduce attack surface but do not eliminate the underlying flaw. Legacy systems running Server 2012 or Server 2012 R2 may require ESU (Extended Security Updates) entitlements to receive the patch.
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Same weakness CWE-822 – Untrusted Pointer Dereference
View allSame technique Information Disclosure
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External POC / Exploit Code
Leaving vuln.today