CVE-2026-45591: CWE-400: Uncontrolled Resource Consumption in Microsoft .NET 10.0
Uncontrolled resource consumption in ASP.NET Core allows an unauthorized attacker to deny service over a network.
AI Analysis
Technical Summary
This vulnerability affects the MessagePack hub protocol implementation used by ASP.NET Core SignalR and Blazor Server in Microsoft .NET 10.0. A remote attacker can send a specially crafted MessagePack payload containing deeply nested arrays that cause excessive recursion, triggering a stack overflow and terminating the affected application or service. This results in a denial of service condition. The flaw is due to insufficient validation of message nesting depth during message processing. Microsoft has released an official fix to address this issue.
Potential Impact
Successful exploitation allows an unauthenticated remote attacker to cause application termination and denial of service by triggering a stack overflow through deeply nested MessagePack payloads. There is no impact on confidentiality or integrity, but availability is severely affected.
Mitigation Recommendations
An official fix is available from Microsoft and should be applied to remediate this vulnerability. Red Hat notes no practical temporary workaround fully mitigates this issue. Customers are advised to apply relevant security updates when available.
CVE-2026-45591: CWE-400: Uncontrolled Resource Consumption in Microsoft .NET 10.0
Description
Uncontrolled resource consumption in ASP.NET Core allows an unauthorized attacker to deny service over a network.
CVSS v3.1
Score 7.5high
Affected software
Microsoft
.NET 10.0
Microsoft
.NET 8.0
Microsoft
.NET 9.0
Microsoft
ASP.NET Core 10.0
Microsoft
ASP.NET Core 8.0
Microsoft
ASP.NET Core 9.0
Microsoft
Microsoft Visual Studio 2026 version 18.6
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AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability affects the MessagePack hub protocol implementation used by ASP.NET Core SignalR and Blazor Server in Microsoft .NET 10.0. A remote attacker can send a specially crafted MessagePack payload containing deeply nested arrays that cause excessive recursion, triggering a stack overflow and terminating the affected application or service. This results in a denial of service condition. The flaw is due to insufficient validation of message nesting depth during message processing. Microsoft has released an official fix to address this issue.
Potential Impact
Successful exploitation allows an unauthenticated remote attacker to cause application termination and denial of service by triggering a stack overflow through deeply nested MessagePack payloads. There is no impact on confidentiality or integrity, but availability is severely affected.
Mitigation Recommendations
An official fix is available from Microsoft and should be applied to remediate this vulnerability. Red Hat notes no practical temporary workaround fully mitigates this issue. Customers are advised to apply relevant security updates when available.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2026-05-12T19:55:45.730Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45591","vendor":"Microsoft"}]
Threat ID: 6a284ce18dd33fbd85664dfa
Added to database: 06/09/2026, 17:26:57 UTC
Last enriched: 08/14/2026, 13:38:58 UTC
Last updated: 09/14/2026, 22:01:34 UTC
Views: 246
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