Mar 2026: .NET Denial of Service Vulnerability
CVE-2026-26127 Published on March 10, 2026
.NET Denial of Service Vulnerability
Out-of-bounds read in .NET allows an unauthorized attacker to deny service over a network.
Weakness Type
Out-of-bounds Read
The software reads data past the end, or before the beginning, of the intended buffer. Typically, this can allow attackers to read sensitive information from other memory locations or cause a crash. A crash can occur when the code reads a variable amount of data and assumes that a sentinel exists to stop the read operation, such as a NUL in a string. The expected sentinel might not be located in the out-of-bounds memory, causing excessive data to be read, leading to a segmentation fault or a buffer overflow. The software may modify an index or perform pointer arithmetic that references a memory location that is outside of the boundaries of the buffer. A subsequent read operation then produces undefined or unexpected results.
Products Associated with CVE-2026-26127
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Affected Versions
Microsoft .NET 10.0:- Version 10.0.0 and below 10.0.4 is affected.
- Version 9.0.0 and below 9.0.14 is affected.
- Version 10.0.0 and below 10.0.4 is affected.
- Version 9.0.0 and below 9.0.14 is affected.
Vulnerable Packages
The following package name and versions may be associated with CVE-2026-26127
| Package Manager | Vulnerable Package | Versions | Fixed In |
|---|---|---|---|
| nuget | Microsoft.NetCore.App.Runtime.win-x64 | >= 9.0.0, <= 9.0.13 | 9.0.14 |
| nuget | Microsoft.NetCore.App.Runtime.win-arm64 | >= 10.0.0, <= 10.0.3 | 10.0.4 |
| nuget | Microsoft.NetCore.App.Runtime.win-x86 | >= 9.0.0, <= 9.0.13 | 9.0.14 |
| nuget | Microsoft.Bcl.Memory | >= 10.0.0, <= 10.0.3 | 10.0.4 |
| nuget | Microsoft.NetCore.App.Runtime.linux-arm | >= 10.0.0, <= 10.0.3 | 10.0.4 |
| nuget | Microsoft.NetCore.App.Runtime.linux-arm64 | >= 10.0.0, <= 10.0.3 | 10.0.4 |
| nuget | Microsoft.NetCore.App.Runtime.linux-musl-arm | >= 10.0.0, <= 10.0.3 | 10.0.4 |
| nuget | Microsoft.NetCore.App.Runtime.linux-musl-arm64 | >= 10.0.0, <= 10.0.3 | 10.0.4 |
| nuget | Microsoft.NetCore.App.Runtime.linux-musl-x64 | >= 10.0.0, <= 10.0.3 | 10.0.4 |
| nuget | Microsoft.NetCore.App.Runtime.linux-x64 | >= 10.0.0, <= 10.0.3 | 10.0.4 |
| nuget | Microsoft.NetCore.App.Runtime.osx-arm64 | >= 10.0.0, <= 10.0.3 | 10.0.4 |
| nuget | Microsoft.NetCore.App.Runtime.osx-x64 | >= 10.0.0, <= 10.0.3 | 10.0.4 |
| nuget | Microsoft.NetCore.App.Runtime.win-arm | >= 10.0.0, <= 10.0.3 | 10.0.4 |
| nuget | Microsoft.NetCore.App.Runtime.win-x64 | >= 10.0.0, <= 10.0.3 | 10.0.4 |
| nuget | Microsoft.NetCore.App.Runtime.win-x86 | >= 10.0.0, <= 10.0.3 | 10.0.4 |
| nuget | Microsoft.NetCore.App.Runtime.win-arm64 | >= 9.0.0, <= 9.0.13 | 9.0.14 |
| nuget | Microsoft.NetCore.App.Runtime.win-arm | >= 9.0.0, <= 9.0.13 | 9.0.14 |
| nuget | Microsoft.NetCore.App.Runtime.osx-x64 | >= 9.0.0, <= 9.0.13 | 9.0.14 |
| nuget | Microsoft.NetCore.App.Runtime.osx-arm64 | >= 9.0.0, <= 9.0.13 | 9.0.14 |
| nuget | Microsoft.NetCore.App.Runtime.linux-x64 | >= 9.0.0, <= 9.0.13 | 9.0.14 |
| nuget | Microsoft.NetCore.App.Runtime.linux-musl-x64 | >= 9.0.0, <= 9.0.13 | 9.0.14 |
| nuget | Microsoft.NetCore.App.Runtime.linux-musl-arm64 | >= 9.0.0, <= 9.0.13 | 9.0.14 |
| nuget | Microsoft.NetCore.App.Runtime.linux-musl-arm | >= 9.0.0, <= 9.0.13 | 9.0.14 |
| nuget | Microsoft.NetCore.App.Runtime.linux-arm64 | >= 9.0.0, <= 9.0.13 | 9.0.14 |
| nuget | Microsoft.NetCore.App.Runtime.linux-arm | >= 9.0.0, <= 9.0.13 | 9.0.14 |
| nuget | Microsoft.Bcl.Memory | >= 9.0.0, <= 9.0.13 | 9.0.14 |
| nuget | idunno.Bluesky | < 1.7.0 | 1.7.0 |
| nuget | idunno.AtProto.OAuthCallback | < 1.7.0 | 1.7.0 |
| nuget | idunno.AtProto | < 1.7.0 | 1.7.0 |