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Severity by source

Vendor (microsoft) PRIMARY
HIGH
qualitative
NVD
8.4 HIGH
AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
vuln.today AI
7.8 HIGH

Local media-parsing overflow realistically needs the victim/operator to process a crafted file, so AV:L and UI:R; no prior privileges (PR:N) and full code-execution impact yields C/I/A:H.

3.1 AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
4.0 AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Primary rating from Vendor (microsoft).

CVSS VectorNVD

Attack Vector
Local
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

5
Analysis Updated
Jul 22, 2026 - 11:58 vuln.today
v2 (cvss_changed)
Re-analysis Queued
Jul 22, 2026 - 11:52 vuln.today
cvss_changed
CVSS changed
Jul 22, 2026 - 11:52 NVD
7.8 (HIGH) 8.4 (HIGH)
Analysis Generated
Jul 14, 2026 - 19:06 vuln.today
CVE Published
Jul 14, 2026 - 17:09 nvd
HIGH 7.8

DescriptionNVD

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 stems from a heap-based buffer overflow (CWE-122) that lets an attacker run arbitrary code in the context of the exploiting process across a broad range of Windows client and server builds, from Windows 10 1607 and Windows Server 2012 through Windows 11 26H1 and Windows Server 2025. Microsoft rates it CVSS 8.4 (AV:L) with total confidentiality, integrity, and availability impact. There is no public exploit identified at time of analysis and CISA SSVC marks exploitation as none, while EPSS sits low at 0.48% (38th percentile).

Technical ContextAI

Media Foundation is the core multimedia platform in modern Windows that handles playback, encoding, and processing of audio/video content through pluggable codecs and media source/sink components; it parses complex, attacker-influenceable container and codec data. The root cause is CWE-122, a heap-based buffer overflow: undersized or improperly validated allocations are overrun when malformed media data is processed, corrupting adjacent heap structures and enabling control-flow hijacking. The CPE and EUVD data confirm the flaw lives in the OS-shipped Media Foundation component rather than a third-party application, so it is present wherever the affected Windows versions are installed.

RemediationAI

Patch available per vendor advisory - apply the Microsoft security update for CVE-2026-56189 (https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-56189), which raises each build to at least its fixed version (for example Windows 11 24H2 to 10.0.26100.8875, Windows Server 2022 to 10.0.20348.5386, Windows Server 2025 to 10.0.26100.33158, Windows 10 22H2 to 10.0.19045.7548). Prioritize systems that routinely process untrusted media. Where immediate patching is impossible, reduce exposure by restricting handling of untrusted audio/video files and streams, avoiding preview/thumbnail generation of untrusted media, and limiting local access on multi-user or server hosts so an attacker cannot supply crafted input to Media Foundation; note these controls degrade multimedia functionality and do not fully eliminate the flaw, so they are stopgaps until the update is deployed.

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CVE-2026-56189 vulnerability details – vuln.today

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