NUGET · JULY 2026 · EARLY WARNING

Denial of Service Vulnerability Reported in.NET 8, 9, 10 XML Encryption

EARLY WARNING · UNCONFIRMED. This page describes a developing threat that 0Day surfaced from early signals and has not yet independently confirmed. Details may change. Always verify against the primary sources before acting.

CVE-2026-50525GHSA-8Q5V-6PQQ-X66HSeverity: HIGH

An early warning has been issued regarding a denial of service vulnerability in the XML encryption implementation of.NET 8,.NET 9, and.NET 10. The vulnerability, tracked as CVE-2026-50525 and GHSA-8Q5V-6PQQ-X66H, is under investigation.

What happened

The vulnerability reportedly exists in the System.Security.Cryptography.Xml component, affecting versions >=10.0.0, <=10.0.9 for.NET 10.0, >=9.0.0, <=9.0.17 for.NET 9.0, and >=8.0.0 for.NET 8.0. An attacker could exploit this vulnerability by supplying crafted encrypted XML, leading to uncontrolled resource consumption and denial of service.

To assess your exposure, check if your applications are using affected versions of the System.Security.Cryptography.Xml component. If so, it is recommended to upgrade to the patched versions: 10.0.10 for.NET 10.0, 9.0.18 for.NET 9.0, and the latest available for.NET 8.0.

For more detailed information, consult the primary sources: [GHSA-8q5v-6pqq-x66h] Microsoft Security Advisory CVE-2026-50525 –.NET Denial of Service Vulnerability.

How 0Day mitigates this

MATCHED TO YOUR ACTUAL DEPENDENCY GRAPH0Day matches every incoming threat signal against your GitHub organization’s full dependency graph, including transitive dependencies. If System.Security.Cryptography.Xml is anywhere in your dependency tree, the engineers who own the affected repositories get a push alert the moment it is flagged — no manual audit to remember to run.

Read how this differs from waiting on a scanner to catch a known advisory, or see the exact, read-only access 0Day needs to do this for an organization.

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