EUVD-2026-73542
GHSA-fjff-cgxf-f3xx
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Network-delivered malicious PDF with no privileges, but realistic exploitation typically needs the victim to open/preview the file, so UI:R; heap-overflow RCE gives full C/I/A.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
3DescriptionCVE.org
Integer overflow or wraparound in Microsoft Windows PDF allows an unauthorized attacker to execute code over a network.
AnalysisAI
Remote code execution in Microsoft Windows PDF rendering affects a broad range of Windows 10, Windows 11, and Windows Server 2016 through 2025 builds, where an integer overflow while parsing a crafted PDF wraps a size calculation and triggers a heap-based buffer overflow (CWE-122). An unauthenticated attacker who delivers a malicious PDF over the network can execute arbitrary code with the privileges of the rendering process. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires that the target host render an attacker-supplied PDF using the Windows PDF component - the concrete prerequisite is that the malicious PDF reaches a rendering path (manual open, preview/thumbnail, indexing, or an application built on Windows.Data.Pdf). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H yields 9.8 and describes the worst case: network reachable, low complexity, no privileges, no user interaction, full CIA impact. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Vendor-released patch: apply the Microsoft security update that raises the affected OS to at least the fixed build listed for each SKU (e.g., 10.0.19045.7725 for Windows 10 22H2, 10.0.26100.9445 for Windows 11 24H2, 10.0.20348.5622 for Windows Server 2022, 10.0.26100.33438 for Windows Server 2025), per the MSRC advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69586. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Inventory all Windows 10, Windows 11, and Windows Server 2016-2025 systems and evaluate exposure to PDF files from external sources (email, downloads, file shares). …
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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
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