Deserialization Vulnerability in .NET Product by Microsoft
CVE-2026-87697

8.8HIGH

Key Information:

Vendor

Microsoft
Status
.net 10.0 Runtime
.net 11.0 Runtime
.net 8.0 Runtime
.net 9.0 Runtime
Vendor
CVE Published:
13 October 2026

What is CVE-2026-87697?

The deserialization vulnerability in .NET allows attackers to exploit the insecure processing of untrusted data, potentially enabling unauthorized remote code execution. This vulnerability poses a significant risk, as it could allow malicious actors to manipulate application behavior and take control over affected systems via network connections.

Affected Version(s)

.NET 10.0 runtime 10.0.0 < 10.0.13

.NET 11.0 runtime 11.0.0 < 11.0.0-rc.2

.NET 8.0 runtime 8.0.0 < 8.0.32

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE...
vendor-advisorypatch

CVSS V3.1

Score:
8.8
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
Required
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.