Dotnet6: A denial of service vulnerability exists in ASP.NET Core SignalR in .NET 8, .NET 9, and .NET 10.
A denial of service vulnerability exists in ASP.NET Core SignalR in .NET 8, .NET 9, and .NET 10. The issue involves stateful reconnect functionality, which an attacker can exploit to deny service to other users. This affects specific Ubuntu package versions of dotnet6. No known exploits are reported in the wild.
AI Analysis
Technical Summary
This vulnerability affects ASP.NET Core SignalR in .NET versions 8, 9, and 10, specifically in certain Ubuntu package builds. The flaw allows an attacker to leverage the stateful reconnect feature to cause a denial of service condition, impacting availability. The vulnerability does not affect confidentiality or integrity. The CVSS 3.1 vector indicates network attack vector, low attack complexity, no privileges or user interaction required, and an impact limited to availability (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H). There is no vendor advisory or patch information provided, and no known exploits have been reported.
Potential Impact
The vulnerability results in a denial of service (availability impact) on ASP.NET Core SignalR services running on affected .NET versions. It does not impact confidentiality or integrity. Attackers can disrupt service for legitimate users by exploiting the stateful reconnect mechanism.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Since no patch or official fix information is provided, users should monitor vendor channels for updates. No specific mitigations are indicated in the provided data.
Dotnet6: A denial of service vulnerability exists in ASP.NET Core SignalR in .NET 8, .NET 9, and .NET 10.
Description
A denial of service vulnerability exists in ASP.NET Core SignalR in .NET 8, .NET 9, and .NET 10. The issue involves stateful reconnect functionality, which an attacker can exploit to deny service to other users. This affects specific Ubuntu package versions of dotnet6. No known exploits are reported in the wild.
CVSS v3.1
Score 7.5high
Affected software
pkg:deb/ubuntu/[email protected]~22.04.1?arch=source&distro=jammypkg:deb/ubuntu/[email protected]~22.04.1?arch=source&distro=jammypkg:deb/ubuntu/[email protected]~22.04.1?arch=source&distro=jammypkg:deb/ubuntu/[email protected]~24.04.1?arch=source&distro=noblepkg:deb/ubuntu/[email protected]~24.04.1?arch=source&distro=noblepkg:deb/ubuntu/[email protected]~25.10.1?arch=source&distro=questingpkg:deb/ubuntu/[email protected]~25.10.1?arch=source&distro=questingpkg:deb/ubuntu/[email protected]~25.10.1?arch=source&distro=questingpkg:deb/ubuntu/[email protected]~26.04.1?arch=source&distro=resoluteRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability affects ASP.NET Core SignalR in .NET versions 8, 9, and 10, specifically in certain Ubuntu package builds. The flaw allows an attacker to leverage the stateful reconnect feature to cause a denial of service condition, impacting availability. The vulnerability does not affect confidentiality or integrity. The CVSS 3.1 vector indicates network attack vector, low attack complexity, no privileges or user interaction required, and an impact limited to availability (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H). There is no vendor advisory or patch information provided, and no known exploits have been reported.
Potential Impact
The vulnerability results in a denial of service (availability impact) on ASP.NET Core SignalR services running on affected .NET versions. It does not impact confidentiality or integrity. Attackers can disrupt service for legitimate users by exploiting the stateful reconnect mechanism.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Since no patch or official fix information is provided, users should monitor vendor channels for updates. No specific mitigations are indicated in the provided data.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- UBUNTU-CVE-2026-56170
- Osv Schema Version
- 1.7.0
- Aliases
- []
- Ecosystems
- ["Ubuntu:22.04:LTS","Ubuntu:24.04:LTS","Ubuntu:25.10","Ubuntu:26.04:LTS"]
- Database Specific Severity
- null
- Cvss Version
- 3.1
Threat ID: 6a5e7a702a4a8d59899de92b
Added to database: 07/20/2026, 19:43:44 UTC
Last enriched: 07/20/2026, 20:52:32 UTC
Last updated: 07/31/2026, 19:24:50 UTC
Views: 8
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