Out-of-bounds read in Microsoft products - CVE-2026-26127

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Main Vulnerability Database Vulnerabilities #VU123779

Out-of-bounds read in Microsoft products - CVE-2026-26127

Published: March 10, 2026


Vulnerability identifier: #VU123779
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-2026-26127
CWE-ID: CWE-125
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 a boundary condition in .NET. A remote attacker can trigger an out-of-bounds read error and cause a denial of service condition on the system.


Affected software

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

How to mitigate CVE-2026-26127

Install updates from vendor's website.

Microsoft.Bcl.Memory - update to 10.0.4
.NET for Linux - addressed in versions 9.0.14, 10.0.4
.NET - addressed in versions 9.0.14, 10.0.4
.NET for macOS - addressed in versions 9.0.14, 10.0.4
dotnet10 (Ubuntu package) - addressed in versions 8.0.25-0ubuntu1~22.04.1, 8.0.25-0ubuntu1~24.04.1, 8.0.25-0ubuntu1~25.10.1, 8.0.125-0ubuntu1~22.04.1, 8.0.125-0ubuntu1~24.04.1, 8.0.125-0ubuntu1~25.10.1, 8.0.125-8.0.25-0ubuntu1~22.04.1, 8.0.125-8.0.25-0ubuntu1~24.04.1, 8.0.125-8.0.25-0ubuntu1~25.10.1, 9.0.14-0ubuntu1~25.10.1, 9.0.115-0ubuntu1~25.10.1, 9.0.115-9.0.14-0ubuntu1~25.10.1, 10.0.4-0ubuntu1~24.04.1, 10.0.4-0ubuntu1~25.10.1, 10.0.104-0ubuntu1~24.04.1, 10.0.104-0ubuntu1~25.10.1, 10.0.104-10.0.4-0ubuntu1~24.04.1, 10.0.104-10.0.4-0ubuntu1~25.10.1
dotnet9.0 (Red Hat package) - addressed in versions 9.0.115-1.el8_10, 9.0.115-1.el9_6, 9.0.115-1.el9_7, 9.0.115-1.el10_0, 9.0.115-1.el10_1
dotnet10.0 (Red Hat package) - addressed in versions 10.0.104-1.el8_10, 10.0.104-1.el9_7, 10.0.104-1.el10_1

External References

Related Security Bulletins