Unauthenticated code execution via heap buffer overflow
Published Aug 11, 2026 · Updated Aug 25, 2026
A heap-based buffer overflow in Microsoft Windows iSCSI Target Service allows remote attackers to execute arbitrary code over a network. Microsoft identifies the faulty locus only as the iSCSI Target Service and has not disclosed which request field overruns which heap allocation. Exploitation requires no authentication or user interaction but has high attack complexity; successful exploitation compromises the affected service and host.
Summary
What happened
A heap-based buffer overflow in Microsoft Windows iSCSI Target Service allows remote attackers to execute arbitrary code over a network. Microsoft identifies the faulty locus only as the iSCSI Target Service and has not disclosed which request field overruns which heap allocation. Exploitation requires no authentication or user interaction but has high attack complexity; successful exploitation compromises the affected service and host.
The record
- CVE
- CVE-2026-65796
- Published
- Aug 11, 2026
- Updated
- Aug 25, 2026
- Vendor
- Microsoft
- Product
- Windows Server 2019
- Classifications
- CWE-122, T1190
- 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.
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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