CVE-2026-50526: Microsoft Security Advisory CVE-2026-50526 – .NET Tampering Vulnerability

Executive summary Microsoft is releasing this security advisory to provide information about a vulnerability in .NET SDK (Microsoft.NET.Build.Containers). This advisory also provides guidance on what developers can do t…

7.0CVSS Score

HIGHSeverity

NOCISA KEV

0.2%EPSS Score

VulnerabilityImpact Type

📋 Vulnerability Details

CVE ID	CVE-2026-50526
Vendor	nuget
Affected Product	Microsoft.NET.Build.Containers
Vulnerability Type	Vulnerability
CVSS Score	7.0 (HIGH)
EPSS Score	0.2% probability of exploitation in the next 30 days
Actively Exploited	❌ No known exploitation
Patch Status	See Vendor Advisory →
Reported By	CYBERDUDEBIVASH SENTINEL APEX Intelligence (via github_advisories)

🔬 Technical Analysis

Executive summary Microsoft is releasing this security advisory to provide information about a vulnerability in .NET SDK (Microsoft.NET.Build.Containers). This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability. A tampering vulnerability exists in the .NET SDK (.NET 8, .NET 9, and .NET 10) container image build process which could allow a local attacker to inject resources that could be incorporated into container images built by other users on the same machine.

Announcement Announcement for this issue can be found at https://github.com/dotnet/announcements/issues/TBD

CVSS Details - Version: 3.1

• Severity: High

• Score: 7.0

• Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

• Weakness:

🎯 Known Indicators of Compromise

{"type":"url","value":"https://github.com/dotnet/announcements/issues/**TBD**","confidence_score":0.82,"first_seen":"2026-07-21","source_count":1} {"type":"domain","value":"microsoft.net","confidence_score":0.75,"first_seen":"2026-07-21","source_count":1}

📚 Advisory References

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