Local code execution via NTFS integer underflow
Published Jul 14, 2026 · Updated Jul 14, 2026
Integer underflow in Microsoft Windows NTFS allows attackers to execute code when a user interacts with attacker-controlled content. An NTFS integer calculation wraps below zero and leads to a heap-based buffer overflow, but Microsoft has not disclosed the affected parser or field. Exploitation requires local access and user interaction and can run attacker-controlled code in the affected user's context.
Summary
What happened
Integer underflow in Microsoft Windows NTFS allows attackers to execute code when a user interacts with attacker-controlled content. An NTFS integer calculation wraps below zero and leads to a heap-based buffer overflow, but Microsoft has not disclosed the affected parser or field. Exploitation requires local access and user interaction and can run attacker-controlled code in the affected user's context.
The record
- CVE
- CVE-2026-50308
- Published
- Jul 14, 2026
- Updated
- Jul 14, 2026
- Vendor
- Microsoft
- Product
- Windows Server 2019
- Classifications
- CWE-122, CWE-191, T1204
- Attack vector
- local
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jul 14, 2026CVE publishedPublication date reported by the CVE source.
- Jul 14, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=10.0.17763.0 <10.0.17763.9020
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
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Your stack
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