Infinite loop in Microsoft products - CVE-2026-42899

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Main Vulnerability Database Vulnerabilities #VU131346

Infinite loop in Microsoft products - CVE-2026-42899

Published: May 13, 2026


Vulnerability identifier: #VU131346
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-42899
CWE-ID: CWE-835
Exploitation vector: Remote access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to infinite loop in ASP.NET Core. A remote attacker can consume all available system resources and cause denial of service conditions.


Affected software

.NET for Linux
.NET for macOS
.NET
Red Hat CodeReady Linux Builder for IBM z Systems
Red Hat CodeReady Linux Builder for ARM 64
Red Hat CodeReady Linux Builder for Power, little endian
Red Hat CodeReady Linux Builder for x86_64
Red Hat Enterprise Linux for ARM 64
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux for x86_64
Red Hat Enterprise Linux Server - AUS
Red Hat Enterprise Linux for x86_64 - Extended Update Support
Red Hat CodeReady Linux Builder for ARM 64 - Extended Update Support
Red Hat CodeReady Linux Builder for IBM z Systems - Extended Update Support
Red Hat CodeReady Linux Builder for Power, little endian - Extended Update Support
Red Hat CodeReady Linux Builder for x86_64 - Extended Update Support
Red Hat Enterprise Linux for ARM 64 - Extended Update Support
Red Hat Enterprise Linux for Power, little endian - Extended Update Support
Red Hat Enterprise Linux for IBM z Systems - Extended Update Support
Ubuntu
Fedora
Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions
dotnet10 (Ubuntu package)
dotnet8.0 (Red Hat package)
dotnet8.0
dotnet9.0 (Red Hat package)
dotnet9.0
dotnet10.0

How to mitigate CVE-2026-42899

Install updates from vendor's website.

.NET for Linux - addressed in versions 8.0.27, 9.0.16
.NET - addressed in versions 8.0.27, 9.0.16
.NET for macOS - addressed in versions 8.0.27, 9.0.16
dotnet10 (Ubuntu package) - addressed in versions 8.0.27-0ubuntu1~22.04.1, 8.0.27-0ubuntu1~24.04.1, 8.0.27-0ubuntu1~25.10.1, 8.0.127-0ubuntu1~22.04.1, 8.0.127-0ubuntu1~24.04.1, 8.0.127-0ubuntu1~25.10.1, 8.0.127-8.0.27-0ubuntu1~22.04.1, 8.0.127-8.0.27-0ubuntu1~24.04.1, 8.0.127-8.0.27-0ubuntu1~25.10.1, 9.0.16-0ubuntu1~25.10.1, 9.0.117-0ubuntu1~25.10.1, 9.0.117-9.0.16-0ubuntu1~25.10.1, 10.0.8-0ubuntu1~24.04.1, 10.0.8-0ubuntu1~25.10.1, 10.0.8-0ubuntu1~26.04.1, 10.0.108-0ubuntu1~24.04.1, 10.0.108-0ubuntu1~25.10.1, 10.0.108-0ubuntu1~26.04.1, 10.0.108-10.0.8-0ubuntu1~24.04.1, 10.0.108-10.0.8-0ubuntu1~25.10.1, 10.0.108-10.0.8-0ubuntu1~26.04.1
dotnet8.0 (Red Hat package) - addressed in versions 8.0.127-1.el8_10, 8.0.127-1.el9_4, 8.0.127-1.el9_8, 8.0.127-1.el10_0, 8.0.127-1.el10_2
dotnet8.0 - addressed in versions 8.0.127-1.fc42, 8.0.127-1.fc43, 8.0.127-1.fc44
dotnet9.0 (Red Hat package) - addressed in versions 9.0.117-1.el10_0, 9.0.117-1.el10_2
dotnet9.0 - addressed in versions 9.0.117-1.fc42, 9.0.117-1.fc43, 9.0.117-1.fc44
dotnet10.0 - addressed in versions 10.0.108-1.fc42, 10.0.108-1.fc43, 10.0.108-1.fc44

External References

Related Security Bulletins