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CVE-2026-32177 Microsoft CVE debrief

CVE-2026-32177 is a high-severity vulnerability in .NET Framework that allows local privilege escalation. The vulnerability is caused by a heap-based buffer overflow and has a CVSS score of 7.3. It was published on May 12, 2026, and modified on June 18, 2026. Affected products include .NET Framework, Visual Studio 2022, and Visual Studio 2026. Microsoft has provided a vendor advisory for mitigation.

Vendor
Microsoft
Product
.NET 10.0
CVSS
HIGH 7.3
CISA KEV
Not listed in stored evidence
Original CVE published
2026-05-12
Original CVE updated
2026-07-15
Advisory published
2026-05-12
Advisory updated
2026-07-15

Who should care

This vulnerability affects .NET Framework users and administrators. It allows local privilege escalation, which means an attacker with local access can exploit this vulnerability to gain elevated privileges.

Technical summary

CVE-2026-32177 is a heap-based buffer overflow vulnerability in .NET Framework. It exists in various versions of .NET Framework, including 3.5, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8, and 4.8.1. The vulnerability also affects Visual Studio 2022 and Visual Studio 2026. The CVSS vector is AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:L.

Defensive priority

High

Recommended defensive actions

  • Apply the patches provided by Microsoft to vulnerable .NET Framework versions.
  • Ensure that .NET Framework is up-to-date with the latest security patches.
  • Use secure coding practices to prevent similar vulnerabilities in custom code.
  • Implement privilege separation and least privilege principles to limit the impact of a potential exploit.
  • Monitor systems for suspicious activity and implement additional security measures as needed.
  • Consider using security-enhanced .NET Framework versions or alternative frameworks with built-in security features.

Evidence notes

The information provided is based on the CVE record and NVD details. The vulnerability was published on May 12, 2026, and modified on June 18, 2026. The CVSS score is 7.3, indicating a high-severity vulnerability.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-32177 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-32177

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

  • CVE-2026-32177 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-32177

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

Supplemental references

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.