EUVD-2026-44300
GHSA-5fw3-4hm3-h8hv
Severity by source
AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Local file-open vector (AV:L) needing user interaction (UI:R) but no attacker privileges (PR:N); heap overflow yields full code execution, so C/I/A all High.
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
Heap-based buffer overflow in Windows Media allows an unauthorized attacker to execute code locally.
AnalysisAI
Local code execution in Windows Media on Windows 11 (24H2, 25H2, 26H1) and Windows Server 2025 lets an attacker run arbitrary code by luring a user into opening a maliciously crafted media file. The CVSS 3.1 base score is 7.8 with full confidentiality, integrity, and availability impact but requiring user interaction, and there is no public exploit identified at time of analysis. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires a user on an affected system (Windows 11 Version 24H2, 25H2, 26H1, or Windows Server 2025) to open or process an attacker-supplied crafted media file handled by the Windows Media component - the CVSS UI:R metric confirms user interaction is mandatory, and AV:L confirms the vector is local (file/data delivery), not remote network exploitation. … 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, score 7.8 High) describes a locally-vectored, user-interaction-dependent flaw with no privileges required but full CIA impact, consistent with a file-open exploitation model rather than remote network reach. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker crafts a malicious media file that triggers the heap overflow in Windows Media and delivers it via phishing email, a chat link, or a compromised website. A user on Windows 11 24H2/25H2/26H1 or Windows Server 2025 opens or previews the file, satisfying the required user interaction, and the corrupted heap yields arbitrary code execution in the user's context. … |
| Remediation | Patch available per vendor advisory - apply the Microsoft security update referenced at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-58542 via Windows Update or WSUS/Intune/SCCM for each affected platform (Windows 11 24H2/25H2/26H1 and Windows Server 2025 including Server Core); the exact patched build number is listed per product in the MSRC update guide and should be sourced there rather than assumed. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, conduct a complete asset inventory of systems running Windows 11 (versions 24H2, 25H2, 26H1) and Windows Server 2025; prepare user communications warning against opening media files from untrusted sources and test patch compatibility in a non-production environment. …
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External POC / Exploit Code
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