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CVE-2026-70174 Microsoft CVE debrief

A .NET remote code execution vulnerability exists due to an improperly implemented security check for standard input in .NET. This issue allows an unauthorized attacker to execute code over a network. The vulnerability is particularly concerning because it can be exploited remotely, potentially allowing attackers to gain control of affected systems. Defenders should assess exposure and prioritize patching to prevent potential exploitation. The CVE Program and NVD provide official records of the vulnerability, and Microsoft has released a patch for the vulnerability.

Vendor
Microsoft
Product
.NET 10.0
CVSS
HIGH 8.8
CISA KEV
Not listed in stored evidence
Original CVE published
2026-10-13
Original CVE updated
2026-10-14
Advisory published
2026-10-13
Advisory updated
2026-10-14

Who should care

Defenders responsible for .NET and .NET Framework deployments, as well as Visual Studio users, should assess exposure and prioritize patching.

Why it matters

CVE-2026-70174 is a .NET remote code execution vulnerability that allows an unauthorized attacker to execute code over a network. Defenders should prioritize patching affected versions to prevent potential exploitation.

  • Remote code execution over a network
  • Potential unauthorized access to sensitive data
  • Possible disruption of critical services
  • Verification of patch deployment and inventory management

Technical summary

The vulnerability exists in .NET and .NET Framework due to an improperly implemented security check for standard input. An attacker can exploit this vulnerability to execute code over a network. The vulnerability is caused by a flaw in the way .NET handles standard input, which allows an attacker to inject malicious code. Defenders should prioritize patching affected .NET and .NET Framework versions, as well as Visual Studio versions, to prevent potential remote code execution.

Defensive priority

Defenders should prioritize patching affected .NET and .NET Framework versions, as well as Visual Studio versions, to prevent potential remote code execution.

Recommended defensive actions

  • Patch affected .NET and .NET Framework versions
  • Patch affected Visual Studio versions
  • Verify inventory of .NET and .NET Framework versions
  • Monitor for suspicious network activity

Evidence notes

The CVE Program and NVD provide official records of the vulnerability. Microsoft has released a patch for the vulnerability. The vulnerability has been publicly disclosed and defenders should prioritize patching affected versions to prevent potential exploitation. There is no evidence of public exploitation, but defenders should verify patch deployment and inventory management. The vulnerability affects .NET and .NET Framework, and Visual Studio users should also assess exposure.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-70174 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-70174

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-70174 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-70174

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

  • .NET Remote Code Execution Vulnerability

    Unverified legacy reference

    URL: https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/70xxx/CVE-2026-70174.json

    cve_program_cvelist_v5

  • Source reference

    Unverified legacy reference

    URL: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-70174

    Supplemental source - vendor-advisory, patch

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.