EUVD-2026-43772
GHSA-m372-98mc-5844
Severity by source
AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
File-delivered media-parsing bug: local vector with required user interaction, no privileges needed, and code execution yields full C/I/A impact in the user context.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
2DescriptionCVE.org
Heap-based buffer overflow in Microsoft Windows Media Foundation allows an unauthorized attacker to execute code locally.
AnalysisAI
Local code execution in Microsoft Windows Media Foundation lets an attacker run arbitrary code in the context of the victim after luring them to open a maliciously crafted media file. The flaw (CVE-2026-58610, CWE-122 heap-based buffer overflow) affects a broad range of Windows client and server releases from Windows 10 1607 through Windows 11 26H1 and Windows Server 2016 through 2025. CVSS is 7.8 (AV:L/AC:L/PR:N/UI:R) with full confidentiality, integrity, and availability impact; there is no public exploit identified at time of analysis and it is not on CISA KEV.
Technical ContextAI
Media Foundation is the core multimedia platform in Windows that handles media playback, encoding, decoding, and streaming, and it parses complex, untrusted container and codec formats - a classic attack surface for memory-corruption bugs. The root cause is CWE-122, a heap-based buffer overflow, meaning a length or bounds calculation during media parsing writes past the end of a heap allocation, corrupting adjacent heap structures. Because Media Foundation components are shipped as part of the OS, the CPE data confirms the vulnerable code is present across the full supported Windows line - Windows 10 (1607, 1809, 21H2, 22H2), Windows 11 (24H2, 25H2, 26H1), and Windows Server 2016/2019/2022/2025 including Server Core installations. Controlled heap corruption of this class can typically be shaped into arbitrary code execution in the process that loaded the media pipeline.
RemediationAI
Apply the Microsoft security update for CVE-2026-58610 to all affected systems; Patch available per vendor advisory (https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-58610), which lists the exact fixed build per Windows and Windows Server SKU - deploy the update matching each system's version rather than a single global version string. Prioritize systems where users routinely open untrusted media (workstations, RDS/VDI hosts, kiosk machines). As interim compensating controls before patching, restrict the opening of untrusted media files and block delivery of such files at the mail and web gateways, and consider deregistering or restricting the associated Media Foundation codecs/handlers for high-risk untrusted content - note this can break legitimate playback of the affected formats and may disrupt applications that embed the media pipeline. User-awareness guidance to avoid opening unsolicited media attachments reduces the UI:R trigger but is not a substitute for the patch.
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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