Windows Message Queuing: Denial of Service through buffer over-read
Summary
A buffer over-read in the Windows Message Queuing (MSMQ) component allows an unauthenticated remote attacker to crash or disrupt the service over the network. The flaw affects several Windows 10, Windows 11 and Windows Server versions. The impact is limited to availability, so no code execution or data disclosure is expected.
Affected
- Windows 10 Version 1607: 10.0.14393.0 to before 10.0.14393.9688
- Windows 10 Version 1809: 10.0.17763.0 to before 10.0.17763.9487
- Windows 10 Version 21H2: 10.0.19044.0 to before 10.0.19044.7846
- Windows 10 Version 22H2: 10.0.19045.0 to before 10.0.19045.7846
- Windows 11 Version 23H2: 10.0.22631.0 to before 10.0.22631.7711
- Windows 11 Version 24H2: 10.0.26100.0 to before 10.0.26100.9974
- Windows 11 Version 25H2: 10.0.26200.0 to before 10.0.26200.9974
- Windows 11 Version 26H1: 10.0.28000.0 to before 10.0.28000.3501
- Windows 11 Version 26H2: 10.0.26300.0 to before 10.0.26300.9974
- Windows Server 2016 (including Server Core): 10.0.14393.0 to before 10.0.14393.9688
- Windows Server 2019 (including Server Core): 10.0.17763.0 to before 10.0.17763.9487
- Windows Server 2022: 10.0.20348.0 to before 10.0.20348.5870
Fixed in
- Install the November 2026 cumulative updates for the affected builds listed above.
- KB article numbers: Unknown.
Workaround
- No CVE-specific workaround known.
- Where MSMQ is not required, remove the feature to reduce exposure.
Exploitation
- No exploitation in the wild reported for this CVE at the time of research.
- No public proof of concept found.
- CISA SSVC: exploitation none, automatable yes, technical impact partial.
Our recommendation
- Identify hosts where Message Queuing is installed.
- Install the November 2026 security update on these hosts in this patch cycle.
- Remove MSMQ from hosts where it is not used.
- Verify the fixed build numbers on the Microsoft Security Update Guide before rollout.
Information from Microsoft (Patch Tuesday November 2026)
- Severity (Microsoft)
- Important
- Impact
- Denial of service – Windows Message Queuing
- 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, KB5131096, KB5131090, KB5131087, KB5132061
Public exploits
PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.
Research sources
- Microsoft Security Update Guide: CVE-2026-105515 msrc.microsoft.com
- CVE.org Record CVE-2026-105515 www.cve.org
- CERT/CC Vulnerability Note VU#763513 www.kb.cert.org
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, 06:13.
Original description (NVD)
Buffer over-read in Windows Message Queuing allows an unauthorized attacker to deny service 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.
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