Visual Studio and .NET: Stack-based buffer overflow leading to code execution
Summary
Microsoft Visual Studio 2026 and the .NET 8, 9, 10 and 11 runtimes on Windows contain a stack-based buffer overflow (CWE-121). An unauthenticated remote attacker can execute code over the network, but user interaction is required. The CVSS score is 8.8 (High), and the exact attack trigger is not described in the sources reviewed. NVD analysis is still pending.
Affected
- Microsoft .NET 8.0 on Windows: 8.0.0 to before 8.0.34
- Microsoft .NET 9.0 on Windows: 9.0.0 to before 9.0.23
- Microsoft .NET 10.0 on Windows: 10.0.0 to before 10.0.15
- Microsoft .NET 11.0 on Windows: 11.0.0-preview.1 to before 11.0.0
- Microsoft Visual Studio 2026 version 18.12 (version range in the CVE record is unclear: 18.12.0 to before 18.12.0; verify with MSRC)
Fixed in
Unknown. Fixed build numbers could not be confirmed from primary sources. Verify the patched versions in the MSRC advisory before rollout.
Workaround
Unknown. No vendor-documented workaround found.
- Interim measures (general guidance, not vendor-confirmed): keep Visual Studio and .NET SDKs/runtimes at the latest servicing level
- Avoid opening untrusted projects or solutions
- Limit build activity with elevated rights
Exploitation
- No known exploitation in the wild or public proof of concept found at the time of research.
- Not listed in CISA KEV (per third-party source).
- CVSS vector (as published): network attack, no privileges, user interaction required, full confidentiality, integrity and availability impact possible.
Our recommendation
- Check the MSRC advisory for fixed build numbers and apply the November 2026 updates for Visual Studio and .NET.
- Inventory developer workstations and build servers with Visual Studio or .NET 8 to 11 installed.
- Check build servers reachable from outside first and restrict them.
- Monitor the MSRC advisory for updates and confirmed fixes.
Information from Microsoft (Patch Tuesday November 2026)
Public exploits
PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.
Research sources
- MSRC Security Update Guide: CVE-2026-114152 msrc.microsoft.com
- CVE Record CVE-2026-114152 www.cve.org
- .NET and .NET Framework November 2026 servicing updates devblogs.microsoft.com
- strix.ai: CVE-2026-114152 (third-party, versions unverified) www.strix.ai
- Visual Studio 2026 release notes learn.microsoft.com
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 10 Nov 2026, 22:45.
Original description (NVD)
Stack-based buffer overflow in Visual Studio 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.
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