Network information disclosure via SMB buffer over-read
Published Aug 11, 2026 · Updated Aug 25, 2026
Buffer over-read in Microsoft Windows SMB Client allows remote attackers to disclose information over a network after user interaction. Microsoft has not disclosed the specific SMB message field, parsing routine, or bounds-checking error that causes the client to read past the buffer. A user must initiate or permit the SMB connection; the reported consequence is disclosure of client memory, not modification or service interruption.
Summary
What happened
Buffer over-read in Microsoft Windows SMB Client allows remote attackers to disclose information over a network after user interaction. Microsoft has not disclosed the specific SMB message field, parsing routine, or bounds-checking error that causes the client to read past the buffer. A user must initiate or permit the SMB connection; the reported consequence is disclosure of client memory, not modification or service interruption.
The record
- CVE
- CVE-2026-65794
- Published
- Aug 11, 2026
- Updated
- Aug 25, 2026
- Vendor
- Microsoft
- Product
- Windows Server 2019
- Classifications
- CWE-126
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Aug 11, 2026CVE publishedPublication date reported by the CVE source.
- Aug 25, 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 <10.0.17763.9121
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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