EUVD-2026-44300
GHSA-5fw3-4hm3-h8hv
Severity by source
AV:L/AC:L/PR:L/UI:N/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 VectorNVD
Lifecycle Timeline
2DescriptionNVD
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. Microsoft has released a patch via MSRC.
Technical ContextAI
The flaw is a CWE-122 heap-based buffer overflow in the Windows Media component, the media parsing/playback subsystem built into Windows. Heap overflows of this class occur when the media parser writes attacker-controlled data past the bounds of a heap-allocated buffer - typically because a length or size field inside a media container/codec stream is trusted without validation - corrupting adjacent heap metadata or object pointers and enabling control-flow hijack. The CPE data confirms the affected surface is limited to Microsoft's newest client and server lines: Windows 11 Version 24H2, 25H2, and 26H1, plus Windows Server 2025 including the Server Core installation.
RemediationAI
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. Because exploitation requires a user to open a crafted media file, effective interim compensating controls include restricting or blocking inbound media file types (e.g., filtering common audio/video container/codec extensions at the email gateway and web proxy) and advising users not to open untrusted media, with the trade-off of disrupting legitimate media workflows; on servers, note that Server Core is affected, so disabling desktop media playback there and avoiding interactive file handling on servers reduces exposure. These mitigations reduce but do not eliminate risk and are a stopgap until the vendor patch is deployed.
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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