UBUNTU-CVE-2026-56170

Advisory lineage Upstream: 1 Downstream: 0
Upstream
CVE-2026-56170
Published: 14 Jul 2026, 00:00
Last modified:20 Jul 2026, 16:21

Vulnerability Summary

Overall Risk (default)
medium
30/100
CVSS Score
7.5 HIGH
3.1 (osv_ubuntu)
EPSS Score
No data
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

14 Jul 2026, 00:00
Published
Vulnerability first disclosed
20 Jul 2026, 16:21
Last Modified
Vulnerability information updated

Description

A denial of service vulnerability exists in ASP.NET Core SignalR in .NET 8, .NET 9, and .NET 10. Stateful reconnect can be leveraged by an attacker to deny service to other users.

CVSS Metrics

  • v3.1•HIGH•Score: 7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected Systems

  • ubuntu•dotnet10

    < 10.0.106-10.0.6-0ubuntu1~24.04.1 | < 10.0.106-10.0.6-0ubuntu1~25.10.1 | < 10.0.107-10.0.7-0ubuntu1~26.04.1

  • ubuntu•dotnet6

    all

  • ubuntu•dotnet7

    all

  • ubuntu•dotnet8

    < 8.0.126-8.0.26-0ubuntu1~22.04.1 | < 8.0.126-8.0.26-0ubuntu1~24.04.1 | < 8.0.126-8.0.26-0ubuntu1~25.10.1

  • ubuntu•dotnet9

    < 9.0.115-9.0.14-0ubuntu1~25.10.1

References (5)