CVE-2026-58542
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedHeap-based buffer overflow in Windows Media allows an unauthorized attacker to execute code locally.
In the news
Third-party coverage- Microsoft July 2026 Patch Tuesday fixes massive 570 flaws, 3 zero-days
- Microsoft CVE Summary - Bleeping Computer
Surfaced from public web coverage — external links open in a new tab.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · moderate confidenceHeap-based buffer overflow vulnerability in Windows Media component allows an unauthenticated attacker to execute arbitrary code locally through memory corruption. The vulnerability stems from improper bounds checking when processing media content, causing overflow of heap-allocated buffers.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.
NVD · CPE data< 10.0.26100.8875< 10.0.26200.8875< 10.0.28000.2269< 10.0.26100.33158CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Local
- Complexity
- Low
- Privileges
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Check Windows version and build numberOpen Command Prompt or PowerShell and run 'winver' or 'systeminfo | findstr /B /C:"OS Name" /C:"OS Version"' to obtain the full Windows build number (e.g., 10.0.26100.XXX)Affected if The installed Windows version matches Windows 11 24h2, 25h2, 26h1, or Windows Server 2025 and the build number is lower than 10.0.26100.8875, 10.0.26200.8875, 10.0.28000.2269, or 10.0.26100.33158 respectively
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Verify Windows Media component is presentCheck if Windows Media Player or Windows Media components are installed. Run 'Get-ItemProperty HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\Setup\WindowsOptionalFeature\* | Where-Object {$_.FeatureName -like "*Media*"}' in PowerShell, or check for wmplayer.exe in C:\Program Files\Windows Media PlayerAffected if Windows Media Player or related media components (MediaFeature, MediaFoundation, or legacy Windows Media codecs) are installed/enabled on the system
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Confirm media processing capabilities are in useReview installed codecs and media handlers: run 'Get-ItemProperty HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\Setup\OptionalFeatures' or check for registered media file associations in HKCR\.mp3, HKCR\.wav, HKCR\.avi, or similar media extensionsAffected if The system has file type associations or codecs registered for processing media content that the vulnerable Windows Media component would handle
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Check for indicators of compromiseReview Windows Event Logs (Application, Security, System) for suspicious process creation, unexpected memory manipulation events, or crashes related to media player processes. Run 'Get-Process | Where-Object {$_.ProcessName -like "*wmplayer*" -or $_.ProcessName -like "*media*"}' to list active media-related processesAffected if Unexpected media player processes, unexplained crashes, or suspicious memory-related events are logged, especially when processing untrusted media files
A user is affected if their Windows 11 or Windows Server 2025 installation has a build number below the patched thresholds AND has Windows Media components enabled that process media content.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
From vendor data10.0.26100.887510.0.26100.3315810.0.26200.8875
Apply Microsoft security patches for Windows Media once released; until then, minimize attack surface by disabling Windows Media Player or associated codecs and monitor for indicators of compromise.
- Consultation4.0 h
- Implementation8.0 h
- Testing6.0 h
- Review / QA3.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $5,888.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2026-58542 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2026-58542 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
- No weaponised exploit code, or anything meant to cause harm
- No spam, self-promotion, credentials, or personal data