Authenticated code execution via kernel-mode driver use-after-free
Published May 12, 2026 · Updated May 12, 2026
Use after free in Windows Server 2025 before 10.0.26100.32860 allows remote authenticated users to execute code through network input. Microsoft identifies freed-object reuse in a kernel-mode driver but has not disclosed the affected driver, input path, or stale-reference operation. Exploitation requires low privileges and user interaction; successful exploitation executes attacker-controlled code on the server.
Summary
What happened
Use after free in Windows Server 2025 before 10.0.26100.32860 allows remote authenticated users to execute code through network input. Microsoft identifies freed-object reuse in a kernel-mode driver but has not disclosed the affected driver, input path, or stale-reference operation. Exploitation requires low privileges and user interaction; successful exploitation executes attacker-controlled code on the server.
The record
- CVE
- CVE-2026-34332
- Published
- May 12, 2026
- Updated
- May 12, 2026
- Vendor
- Microsoft
- Product
- Windows Server 2025 (Server Core installation)
- Classifications
- CWE-416
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- May 12, 2026CVE publishedPublication date reported by the CVE source.
- May 12, 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=10.0.26100.0 <10.0.26100.32860
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.
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Technologies
Your stack
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Your stack
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