EUVD-2026-44105
GHSA-77fr-5p3g-f5p5
Severity by source
AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Local kernel-driver flaw needing a user to mount crafted UDF media (AV:L/UI:R) with no prior privileges (PR:N), yielding kernel-level escalation with high C/I/A.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Lifecycle Timeline
2DescriptionCVE.org
Windows Universal Disk Format File System Driver (UDFS) Elevation of Privilege Vulnerability
AnalysisAI
Elevation of privilege in the Microsoft Windows Universal Disk Format File System driver (UDFS) allows a local attacker to gain higher privileges after a user mounts or opens a maliciously crafted UDF-formatted volume such as an ISO or disc image. The flaw is an out-of-bounds read (CWE-125) in the kernel-mode UDFS parser, and successful exploitation yields high impact to confidentiality, integrity, and availability (CVSS 7.8). …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the victim to mount or open an attacker-crafted UDF-formatted volume - an ISO, disc image, or optical medium that Windows parses with the UDFS driver - and that mount action is the UI:R user interaction the CVSS vector specifies. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 vector (AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H, 7.8 High) describes a local, low-complexity attack requiring user interaction but no prior privileges, with high impact across all three security properties - a classic local privilege-escalation profile that pairs well with phishing or removable-media delivery. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker emails or hosts a specially crafted UDF-formatted ISO or disc image and lures a standard user into opening it; when Windows mounts the volume, the kernel UDFS driver parses malformed on-disk metadata, triggering the out-of-bounds read and enabling privilege escalation on the host. The local vector with required user interaction (AV:L/UI:R) makes this a plausible second-stage tool following phishing or low-privilege access. … |
| Remediation | Apply the Microsoft security update for CVE-2026-50498 for your specific Windows or Windows Server build; Patch available per vendor advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50498, which lists the exact fixed build per OS version, so confirm the KB/build for each affected image rather than expecting a single cross-platform version. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify all Windows endpoints and servers through WSUS, Intune, or System Center asset inventory to establish patch baseline and identify high-risk systems. …
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Same weakness CWE-125 – Out-of-bounds Read
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External POC / Exploit Code
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