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Windows Media Foundation CVE-2026-54993

| EUVDEUVD-2026-44009 HIGH
Heap-based Buffer Overflow (CWE-122)
2026-07-14 microsoft GHSA-cm62-wjrc-9gqm
7.8
CVSS 3.1 · Vendor: microsoft
Temporal: 6.8
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Severity by source

Vendor (microsoft) PRIMARY
7.8 HIGH
AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CIRCL (temporal)
6.8 MEDIUM
cvss
vuln.today AI
7.8 HIGH

Victim must open a crafted file, so AV:L and UI:R; no privileges needed (PR:N) and memory-corruption RCE yields full C/I/A.

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 VectorVendor: microsoft

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Attack Vector
Local
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

2
Analysis Generated
Jul 14, 2026 - 18:03 vuln.today
CVE Published
Jul 14, 2026 - 17:04 nvd
HIGH 7.8

DescriptionCVE.org

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 lets an unauthorized attacker run arbitrary code by luring a user into opening a specially crafted media file. The flaw affects a broad range of Windows 10, Windows 11, and Windows Server builds (from 1809 through Windows 11 26H1 and Server 2025), and Microsoft has released patches. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Deliver crafted media file to victim
Delivery
User opens file in Media Foundation
Exploit
Trigger heap-based buffer overflow in parser
Execution
Corrupt heap and hijack execution
Impact
Execute arbitrary code as user

Vulnerability AssessmentAI

Exploitation Exploitation requires a local delivery path plus user interaction: the victim must open, preview, or otherwise cause Windows Media Foundation to process an attacker-supplied crafted media file (AV:L, UI:R). … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 3.1 base score is 7.8 (AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H): exploitation is local and requires user interaction (opening/processing a malicious file) but needs no prior privileges and yields full confidentiality, integrity, and availability impact. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker sends a victim a booby-trapped video or audio file via email, chat, or a malicious webpage and, when the user opens or previews it, Media Foundation parses the malformed stream and triggers the heap overflow, executing attacker code in the user's context. No public exploit is identified at time of analysis, but the low attack complexity (AC:L) means a reliable exploit, once developed, would work against default installs with a single user click.
Remediation Patch available per vendor advisory: apply the Microsoft security update for your specific Windows or Windows Server build as listed at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-54993 (the input does not provide a single fix version because patched builds differ per SKU - pull the exact KB/build from the MSRC page). … Detailed patch versions, workarounds, and compensating controls in full report.

Recommended ActionAI

Within 24 hours, inventory all Windows systems running builds 1809 through 26H1 of Windows 10, 11, or Server 2025 to establish organizational scope; simultaneously issue a security alert instructing users to avoid opening media files from untrusted sources. …

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CVE-2026-54993 vulnerability details – vuln.today

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