EUVD-2026-44272
GHSA-g8ch-3246-6ggg
Severity by source
AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
File-parsing RCE requires the victim to open malicious media (AV:L, UI:R) with no prior privileges (PR:N); successful exploitation yields full code execution, so C/I/A all High.
Primary rating from Vendor (microsoft).
CVSS VectorNVD
Lifecycle Timeline
5DescriptionNVD
Heap-based buffer overflow in Microsoft Windows Media Foundation allows an unauthorized attacker to execute code over a network.
AnalysisAI
Remote code execution in Microsoft Windows Media Foundation allows an attacker to run arbitrary code by inducing a victim to open a maliciously crafted media file, exploiting a heap-based buffer overflow (CWE-122). All supported Windows client and server releases from Windows 10 1607 through Windows 11 26H1 and Windows Server 2016 through 2025 are affected. There is no public exploit identified at time of analysis; EPSS is low (0.83%) and CISA SSVC records exploitation status as none, but the technical impact is total.
Technical ContextAI
Windows Media Foundation is the core multimedia framework in modern Windows used to parse, decode, and render audio/video content across applications, browsers, and Office documents. The flaw is a CWE-122 heap-based buffer overflow, meaning attacker-controlled input (a malformed media stream or file) is copied into a heap allocation without proper bounds checking, corrupting adjacent heap memory and metadata. Because Media Foundation processes untrusted media through many entry points, controlled corruption of the heap can be leveraged into arbitrary code execution in the context of the process parsing the file. The CPE set confirms the affected component ships across Windows 10 (1607, 1809, 21H2, 22H2), Windows 11 (24H2, 25H2, 26H1), and Windows Server 2016/2019/2022/2025 including Server Core installations.
RemediationAI
Apply the Microsoft security update for CVE-2026-57087 via Windows Update or WSUS; Vendor-released patch: reach the fixed cumulative build for your release - Windows 10 1607/Server 2016 build 10.0.14393.9339, Windows 10 1809/Server 2019 build 10.0.17763.9020, Windows 10 21H2 build 10.0.19044.7548, 22H2 build 10.0.19045.7548, Windows 11 24H2/25H2 build 10.0.26100.8875, 26H1 build 10.0.28000.2525, Windows Server 2022 build 10.0.20348.5386, and Windows Server 2025 build 10.0.26100.33158, as documented at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-57087. Where patching must be deferred, reduce exposure by restricting handling of untrusted media: block or quarantine inbound media files at the email and web gateway, discourage users from opening media from unknown sources, and consider disabling or restricting automatic media preview/thumbnail generation in Explorer and mail clients since that can trigger parsing without an explicit open - noting the trade-off of degraded media preview functionality for users.
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Same weakness CWE-122 – Heap-based Buffer Overflow
View allSame technique Heap Overflow
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External POC / Exploit Code
Leaving vuln.today