EUVD-2026-56402
GHSA-cv2h-rvg3-33px
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local vector and low-privilege requirement match 'authorized attacker' language; AC:L reflects no special technique needed; full CIA triad impact from arbitrary code execution.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
3DescriptionCVE.org
Heap-based buffer overflow in Windows GDI+ allows an authorized attacker to execute code locally.
AnalysisAI
Local code execution via heap-based buffer overflow in Windows GDI+ (Graphics Device Interface Plus) affects a wide range of Windows desktop and server editions from Windows Server 2012 through Windows 11 26H1 and Windows Server 2025. Any locally authenticated low-privilege user can trigger the overflow, gaining full control over confidentiality, integrity, and availability on the affected host. No public exploit code has been identified at time of analysis, and the vulnerability does not appear in the CISA KEV catalog, but Microsoft has released patches across all affected version branches.
Technical ContextAI
Windows GDI+ is the Windows subsystem responsible for 2D vector graphics rendering, image processing, and typography output. It is a core OS component present across all Windows client and server SKUs, processing graphics operations from both user applications and OS-level rendering pipelines. CWE-122 (Heap-based Buffer Overflow) identifies the root cause: GDI+ writes beyond the bounds of a heap-allocated buffer, corrupting adjacent memory structures. Because heap layout can often be influenced by an attacker through controlled allocations prior to triggering the overflow, this class of vulnerability frequently yields reliable code execution primitives. The CVSS vector confirms the attack surface is local (AV:L), suggesting the vulnerable code path is triggered by a crafted local operation - likely processing a malformed image format or graphics API call - rather than a remotely reachable network service. Affected product versions span 19 distinct Windows SKUs from build 6.2.9200 (Server 2012) through 10.0.28000 (Windows 11 26H1), as confirmed by ENISA EUVD-2026-56402.
RemediationAI
Apply the Microsoft security update immediately via Windows Update or WSUS. Specific fix builds confirmed by EUVD-2026-56402 are: Windows 11 24H2/Server 2025 - 10.0.26100.9168 or later (client) / 10.0.26100.33296 or later (server); Windows 11 25H2 - 10.0.26200.9168 or later; Windows 11 26H1 - 10.0.28000.2704 or later; Windows 11 23H2 - 10.0.22631.7517 or later; Windows 10 21H2/22H2 - 10.0.19044.7663 / 10.0.19045.7663 or later; Windows 10 1607 and Server 2016 - 10.0.14393.9418 or later; Windows 10 1809 and Server 2019 - 10.0.17763.9115 or later; Windows Server 2022 - 10.0.20348.5499 or later; Windows Server 2012 R2 - 6.3.9600.23337 or later; Windows Server 2012 - 6.2.9200.26279 or later. The full advisory is at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-62890. If immediate patching is not possible, restrict local interactive and remote desktop access to only trusted, named accounts, and audit local user account membership to reduce the pool of potential attackers; note this does not eliminate the vulnerability but raises the barrier to exploitation.
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Same weakness CWE-122 – Heap-based Buffer Overflow
View allSame technique Buffer Overflow
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External POC / Exploit Code
Leaving vuln.today