CVE-2026-50655
Microsoft Windows Media Foundation Remote Code Execution Vulnerability
Description
Heap-based buffer overflow in Windows Media allows an unauthorized attacker to execute code locally.
In plain language
AI Act nowCVE-2026-50655 is a Windows vulnerability in Windows Media that can let an attacker run code on your PC after you open a specially crafted media file; if you run the listed Windows versions, you should update soon because Microsoft has already published fixes.
CVE-2026-50655 is a heap-based buffer overflow in Windows Media that can lead to local remote code execution when an attacker can get a victim to open a maliciously crafted media input; Microsoft has released fixed builds for Windows 10/11 and Windows Server 2016/2019/2022/2025.
What to do now
- Check your exact Windows 10/11 or Windows Server version and OS build number (the “About” page / system info / or your IT inventory tool).
- Compare your build to the Microsoft fixed builds for CVE-2026-50655:
- Windows 10: 10.0.14393.9339 OR 10.0.17763.9020 OR 10.0.19044.7548 OR 10.0.19045.7548
- Windows 11: 10.0.26100.8875 OR 10.0.26200.8875 OR 10.0.28000.2525
- Windows Server 2016: 10.0.14393.9339
- Windows Server 2019: 10.0.17763.9020
- Windows Server 2022: 10.0.20348.5386
- Windows Server 2025: 10.0.26100.33158
- Install the Microsoft update(s) for CVE-2026-50655 for your system until you reach a fixed build.
- If patching is delayed, immediately restrict staff from opening unexpected media files (especially files received via email or chat) and ensure endpoint protection and logging are enabled so you can detect suspicious behavior.
CVSS Vector Breakdown
AV:LAttack VectorAC:LAttack ComplexityPR:NPrivileges RequiredUI:RUser InteractionS:UScopeC:HConfidentialityI:HIntegrityA:HAvailabilityWeaknesses
Affected Products
Exploitability
Attack Graph
Click technique nodes for MITRE ATT&CK details · drag to pan · Ctrl/⌘ + scroll to zoom, or go fullscreen.
MITRE ATT&CK
1 techniqueReferences
- Microsoft and Adobe Patch Tuesday, July 2026 Security Update Reviewen-us·Qualys Security Blog· Patch Windows patch-tuesday
- Microsoft Patch Tuesday for July 2026 — Snort rules and prominent vulnerabilitiesen·Cisco Talos· Exploited Active Directory Federation Services (AD FS) rce
- Microsoft Patch Tuesday July 2026 - The AI Acopolypse is Hereen·SANS Internet Storm Center· Exploited Windows privilege-escalation
- Microsoft July 2026 Patch Tuesday fixes massive 570 flaws, 3 zero-daysen-us·BleepingComputer· Exploited .NET zero-day
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