CVE-2026-70159 — ASP.NET Core Denial of Service Vulnerability

Executive Summary

Allocation of resources without limits or throttling in ASP.NET Core allows an unauthorized attacker to deny service over a network.

Overview

7.5

CVSS HIGH

Important

MS Severity

Not Exploited

MS Exploit Status

Less Likely

MS Exploit Likelihood

Category Denial of Service

Weakness CWE-770: Allocation of Resources Without Limits or Throttling

Released Oct 13 2026

Last Updated Oct 13 2026

Publicly Disclosed No

CISA KEV Not Listed

Known Exploits None Known

CVSS Vector

ATTACK VECTOR

Network

ATTACK COMPLEXITY

Low

PRIVILEGES REQUIRED

None

USER INTERACTION

None

SCOPE

Unchanged

CONFIDENTIALITY

None

INTEGRITY

None

AVAILABILITY

High

EXPLOIT CODE MATURITY

Unproven

REMEDIATION LEVEL

Official Fix

REPORT CONFIDENCE

Confirmed

Temporal Score: 6.5

EPSS Score

No EPSS score available for this CVE.

View on FIRST.org

Affected Products

26 affected products

Product	KB Article	Severity	Impact	Restart Required
Microsoft Visual Studio 2022 version 17.14	`Release Notes (Security Update)`	Important	Denial of Service	Yes
Microsoft Visual Studio 2026 version 18.10	`Release Notes (Security Update)`	Important	Denial of Service	Yes
Microsoft.AspNetCore.SignalR.Common on .NET 10.0 installed on Linux	`Release Notes (Security Update)`	Important	Denial of Service	Unknown
Microsoft.AspNetCore.SignalR.Common on .NET 10.0 installed on Mac OS	`Release Notes (Security Update)`	Important	Denial of Service	Unknown
Microsoft.AspNetCore.SignalR.Common on .NET 10.0 installed on Windows	`Release Notes (Security Update)`	Important	Denial of Service	Unknown
Microsoft.AspNetCore.SignalR.Common on .NET 11.0 installed on Linux	`Release Notes (Security Update)`	Important	Denial of Service	Unknown
Microsoft.AspNetCore.SignalR.Common on .NET 11.0 installed on Mac OS	`Release Notes (Security Update)`	Important	Denial of Service	Unknown
Microsoft.AspNetCore.SignalR.Common on .NET 11.0 installed on Windows	`Release Notes (Security Update)`	Important	Denial of Service	Unknown
Microsoft.AspNetCore.SignalR.Common on .NET 8.0 installed on Linux	`Release Notes (Security Update)`	Important	Denial of Service	Unknown
Microsoft.AspNetCore.SignalR.Common on .NET 8.0 installed on Mac OS	`Release Notes (Security Update)`	Important	Denial of Service	Unknown
Microsoft.AspNetCore.SignalR.Common on .NET 8.0 installed on Windows	`Release Notes (Security Update)`	Important	Denial of Service	Unknown
Microsoft.AspNetCore.SignalR.Common on .NET 9.0 installed on Linux	`Release Notes (Security Update)`	Important	Denial of Service	Unknown
Microsoft.AspNetCore.SignalR.Common on .NET 9.0 installed on Mac OS	`Release Notes (Security Update)`	Important	Denial of Service	Unknown
Microsoft.AspNetCore.SignalR.Common on .NET 9.0 installed on Windows	`Release Notes (Security Update)`	Important	Denial of Service	Unknown
Microsoft.AspNetCore.SignalR.Core on .NET 10.0 installed on Linux	`Release Notes (Security Update)`	Important	Denial of Service	Unknown
Microsoft.AspNetCore.SignalR.Core on .NET 10.0 installed on Mac OS	`Release Notes (Security Update)`	Important	Denial of Service	Unknown
Microsoft.AspNetCore.SignalR.Core on .NET 10.0 installed on Windows	`Release Notes (Security Update)`	Important	Denial of Service	Unknown
Microsoft.AspNetCore.SignalR.Core on .NET 11.0 installed on Linux	`Release Notes (Security Update)`	Important	Denial of Service	Unknown
Microsoft.AspNetCore.SignalR.Core on .NET 11.0 installed on Mac OS	`Release Notes (Security Update)`	Important	Denial of Service	Unknown
Microsoft.AspNetCore.SignalR.Core on .NET 11.0 installed on Windows	`Release Notes (Security Update)`	Important	Denial of Service	Unknown
Microsoft.AspNetCore.SignalR.Core on .NET 8.0 installed on Linux	`Release Notes (Security Update)`	Important	Denial of Service	Unknown
Microsoft.AspNetCore.SignalR.Core on .NET 8.0 installed on Mac OS	`Release Notes (Security Update)`	Important	Denial of Service	Unknown
Microsoft.AspNetCore.SignalR.Core on .NET 8.0 installed on Windows	`Release Notes (Security Update)`	Important	Denial of Service	Unknown
Microsoft.AspNetCore.SignalR.Core on .NET 9.0 installed on Linux	`Release Notes (Security Update)`	Important	Denial of Service	Unknown
Microsoft.AspNetCore.SignalR.Core on .NET 9.0 installed on Mac OS	`Release Notes (Security Update)`	Important	Denial of Service	Unknown
Microsoft.AspNetCore.SignalR.Core on .NET 9.0 installed on Windows	`Release Notes (Security Update)`	Important	Denial of Service	Unknown

Patches

1 patch

Article	Type	Restart
`Release Notes`	Security Update	Yes

Exploits & PoC

No public exploit or PoC has been linked for this CVE yet. When available, references are sourced from public repositories and may be unverified or non-functional — review carefully before use.

Detection Rules

No public Sigma or Nuclei detection rule has been mapped to this CVE yet. Coverage is concentrated on exploited / high-profile vulnerabilities; check SigmaHQ for updates.

Acknowledgments

Vincent55 Yang
nono

References

MSRC Advisory MITRE NVD