Windows Server: Heap-based buffer overflow in Windows Storage
Summary
A heap-based buffer overflow in the Windows Storage component of Windows Server allows an unauthenticated remote attacker to execute code. The attack requires that a user interacts with a crafted file or link, according to the CVSS vector. Servers reachable from the network, such as file servers, carry the highest risk.
Affected
- Windows Server 2016 and Server Core installation: 10.0.14393.0 before 10.0.14393.9688
- Windows Server 2019 and Server Core installation: 10.0.17763.0 before 10.0.17763.9487
- Windows Server 2022: 10.0.20348.0 before 10.0.20348.5870
- Windows Server 2025 and Server Core installation: 10.0.26100.0 before 10.0.26100.33822
Fixed in
- Windows Server 2016 and Server Core: 10.0.14393.9688 or later
- Windows Server 2019 and Server Core: 10.0.17763.9487 or later
- Windows Server 2022: 10.0.20348.5870 or later
- Windows Server 2025 and Server Core: 10.0.26100.33822 or later
KB article numbers: Unknown.
Workaround
Unknown. No vendor workaround was identified in the sources reviewed.
Exploitation
- No evidence of exploitation in the wild found at the time of research.
- Microsoft rates exploit code maturity as unproven (E:U).
- CISA SSVC: Exploitation none, Automatable no, Technical Impact total.
- No EPSS score or CISA KEV entry found.
Our recommendation
- Inventory all Windows Server 2016, 2019, 2022 and 2025 hosts, including Server Core installations.
- Prioritise internet-facing servers and file-sharing systems.
- Apply the Microsoft security update from the MSRC advisory as soon as possible.
- Restrict access to file shares and remind users not to open untrusted files or links.
- Re-check NVD, CISA KEV and MSRC for changes in exploitation status.
Information from Microsoft (Patch Tuesday November 2026)
- Severity (Microsoft)
- Important
- Impact
- Remote code execution – Windows Storage
- Status on Patch Tuesday
- Neither exploited nor publicly disclosed
- Exploitability assessment
- Exploitation less likely
- Product family
- Windows, Windows ESU (Extended Security Updates)
- Updates (KB)
- KB5131291, KB5131085, KB5131090, KB5131080, KB5131077
Public exploits
PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.
Research sources
- Microsoft Security Update Guide (MSRC) msrc.microsoft.com
- CVE.org record (Microsoft CNA) www.cve.org
- Strix.ai CVE-2026-105534 www.strix.ai
Researched and written up in English and German by an AI (Claude by Anthropic) based on NVD, CISA, EPSS and the sources listed. The vendor information is authoritative. Researched on 11 Nov 2026, 00:01.
Original description (NVD)
Heap-based buffer overflow in Windows Storage allows an unauthorized attacker to execute code over a network.
NVD references (1)
Sources
The tracker combines official, freely usable data sources – updated continuously:
- NVD (NIST) – CVEs, rating (CVSS), affected products
- CISA KEV – vulnerabilities confirmed by CISA as actively exploited
- CISA Vulnrichment – CISA assessment (SSVC) in the official CVE record
- FIRST EPSS – probability of exploitation
- Microsoft MSRC – Patch Tuesday: vulnerabilities, severity, updates
- PoC-in-GitHub – public proof-of-concept repositories
- Metasploit (Rapid7) – modules of the Metasploit Framework
- Exploit-DB (OffSec) – archive of public exploits (links only)
- Patch days: official vendor pages (linked per vendor) (Vendor patch days)
This product uses data from the NVD API but is not endorsed or certified by the NVD. EPSS data © FIRST.org.
Affected? We can help.
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