EUVD-2026-43914
GHSA-6cmp-rhvh-74c5
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local media-processing EoP needs an existing low-priv foothold (AV:L, PR:L), triggers reliably (AC:L) with no victim interaction, yielding full SYSTEM compromise (C/I/A:H) within one system (S:U).
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
2DescriptionCVE.org
Heap-based buffer overflow in Windows Media allows an authorized attacker to elevate privileges locally.
AnalysisAI
Local privilege escalation in the Windows Media component of Windows 11 (versions 24H2, 25H2, and 26H1) allows an already-authenticated low-privileged user to run code with elevated (typically SYSTEM) rights by triggering a heap-based buffer overflow. Microsoft, the reporting party, has released a patch through its Update Guide. No public exploit identified at time of analysis, and the flaw is not listed in CISA KEV, so there is no evidence of active exploitation, though EIP-class memory-corruption bugs in core OS components are attractive follow-on targets after initial access.
Technical ContextAI
Windows Media is a core multimedia subsystem in Windows responsible for parsing and rendering audio/video content and media metadata. The root cause is CWE-122 (heap-based buffer overflow): the component allocates a buffer on the heap and writes beyond its bounds, corrupting adjacent heap structures, which can be groomed to hijack control flow or write attacker-controlled data into privileged memory. Per the CPE data, the affected code ships in the client media stack of Windows 11 Version 24H2 (cpe:2.3:a:microsoft:windows_11_version_24h2), 25H2, and 26H1; because the vulnerable code runs in a higher-privileged context, a controlled overflow yields elevation of privilege rather than just a crash.
RemediationAI
Patch available per vendor advisory: apply the Microsoft security update for CVE-2026-50336 via Windows Update or the corresponding cumulative update for your Windows 11 branch (24H2, 25H2, or 26H1), using the exact fixed build listed at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50336 - the input does not include a single fix version string, so pull the per-SKU KB from that page. Because exploitation requires local low-privileged access, compensating controls until patching completes include enforcing least privilege and restricting interactive/standard-user logon on high-value hosts, applying application control (WDAC/AppLocker) to limit which media-handling binaries untrusted users can invoke, and monitoring EDR for anomalous child-process creation or token elevation from media-related processes; note these reduce but do not eliminate risk, and application-control policies can break legitimate media workflows if scoped too broadly.
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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