CVE-2026-50417
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 NTFS allows an authorized 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 in Windows NTFS file system driver allows a local authorized attacker to execute arbitrary code due to improper bounds checking when handling NTFS metadata operations.
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< 10.0.14393.9339< 10.0.17763.9020< 10.0.19044.7548< 10.0.19045.7548< 10.0.26100.8875< 10.0.26200.8875< 10.0.28000.2525all versions= r2CVSS 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 numberRun 'winver' from command prompt or 'systeminfo | findstr /B /C:"OS Name" /C:"Version"' to display the installed Windows version and build numberAffected if The build number is lower than the fixed version for your Windows release (10.0.14393.9339 for 1607, 10.0.17763.9020 for 1809, 10.0.19044.7548 for 21h2, 10.0.19045.7548 for 22h2, 10.0.26100.8875 for 11 24h2, 10.0.26200.8875 for 11 25h2, 10.0.28000.2525 for 11 26h1)
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Confirm Windows 10 releaseRun 'winver' and note the version (such as 'Version 1607', 'Version 1809', 'Version 21H2', or 'Version 22H2') displayed in the dialogAffected if The reported version corresponds to an affected release and the build number is below the fixed threshold
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Check Windows 11 releaseRun 'winver' and note the version displayed (such as 'Version 24H2', 'Version 25H2', or 'Version 26H1')Affected if The reported version is one of the affected Windows 11 releases and the build number is below the fixed threshold for that release
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Confirm Windows Server 2012Run 'systeminfo' or 'winver' and verify the Windows edition and versionAffected if The system is running Windows Server 2012 or Windows Server 2012 R2 (all versions are affected)
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Verify NTFS file system in useRun 'fsutil fsinfo volumeinfo C:' (or any local drive letter) and check the 'File System Name' value in the outputAffected if The file system is NTFS (the vulnerability exists in the NTFS driver; non-NTFS volumes are not affected)
A system is affected if it runs any of the listed Windows versions with a build number below the fixed threshold and uses NTFS as the file system.
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 data10.0.14393.933910.0.17763.902010.0.19044.7548
Apply Microsoft security updates for Windows NTFS vulnerability; until patch is available, limit local user privileges and implement file system monitoring for anomalous operations.
- Consultation6.0 h
- Implementation8.0 h
- Testing12.0 h
- Review / QA6.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $8,832.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2026-50417 — 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-2026-50417 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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A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.
- 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
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