Unauthenticated code execution via use-after-free
Published Sep 8, 2026 · Updated Sep 10, 2026
Use-after-free in Microsoft Windows DNS Server allows remote attackers to execute code over a network on affected Windows Server builds. Microsoft identifies Windows DNS as the affected component but has not published the freed object's lifecycle, the request path that retains it, or the malformed DNS input that triggers its reuse. No authentication or user interaction is required, but successful exploitation has high complexity and grants code execution in the DNS server's security context.
Summary
What happened
Use-after-free in Microsoft Windows DNS Server allows remote attackers to execute code over a network on affected Windows Server builds. Microsoft identifies Windows DNS as the affected component but has not published the freed object's lifecycle, the request path that retains it, or the malformed DNS input that triggers its reuse. No authentication or user interaction is required, but successful exploitation has high complexity and grants code execution in the DNS server's security context.
The record
- CVE
- CVE-2026-69858
- Published
- Sep 8, 2026
- Updated
- Sep 10, 2026
- Vendor
- Microsoft
- Product
- Windows Server 2025 (Server Core installation)
- Classifications
- CWE-416, T1210
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Sep 8, 2026CVE publishedPublication date reported by the CVE source.
- Sep 10, 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 <10.0.26100.33438
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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