Local code execution via ReFS heap overflow
Published Jul 14, 2026 · Updated Jul 14, 2026
Heap-based buffer overflow in Microsoft Windows ReFS allows local users to execute arbitrary code after user interaction. Microsoft identifies ReFS as the affected component but has not published the parsing path, malformed structure, or memory-copy operation that overruns the heap. Exploitation requires local access and user interaction; successful exploitation runs attacker-controlled code on the affected host.
Summary
What happened
Heap-based buffer overflow in Microsoft Windows ReFS allows local users to execute arbitrary code after user interaction. Microsoft identifies ReFS as the affected component but has not published the parsing path, malformed structure, or memory-copy operation that overruns the heap. Exploitation requires local access and user interaction; successful exploitation runs attacker-controlled code on the affected host.
The record
- CVE
- CVE-2026-58530
- Published
- Jul 14, 2026
- Updated
- Jul 14, 2026
- Vendor
- Microsoft
- Product
- Windows Server 2019
- Classifications
- CWE-122, T1203
- 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.
Public exploit references
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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