Vulnerability · Published Oct 13, 2026 · Assigned by microsoft
CVE-2026-96958.NET Denial of Service Vulnerability
High 7.5
In plain English
A high-severity security flaw in Microsoft .NET Framework 3.5 from Microsoft. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.2% (higher than 68% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)7.5High
Exploit odds (30 days)1.2%top 31.6% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
Inefficient algorithmic complexity in .NET allows an unauthorized attacker to deny service over a network.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux:10 | aspnetcore-runtime-10.0 | 10.0.13-1.el10_2 | ALSA-2026:86195 |
| AlmaLinux:8 | aspnetcore-runtime-10.0 | 10.0.13-1.el8_10 | ALSA-2026:86192 |
| AlmaLinux:9 | aspnetcore-runtime-10.0 | 10.0.13-1.el9_8 | ALSA-2026:86193 |
| AlmaLinux:10 | aspnetcore-runtime-8.0 | 8.0.32-1.el10_2 | ALSA-2026:86168 |
| AlmaLinux:8 | aspnetcore-runtime-8.0 | 8.0.32-2.el8_10 | ALSA-2026:86594 |
| AlmaLinux:9 | aspnetcore-runtime-8.0 | 8.0.32-1.el9_8 | ALSA-2026:86169 |
| AlmaLinux:10 | aspnetcore-runtime-9.0 | 9.0.21-1.el10_2 | ALSA-2026:86172 |
| AlmaLinux:8 | aspnetcore-runtime-9.0 | 9.0.21-1.el8_10 | ALSA-2026:86170 |
| AlmaLinux:9 | aspnetcore-runtime-9.0 | 9.0.21-1.el9_8 | ALSA-2026:86171 |
| AlmaLinux:10 | aspnetcore-runtime-dbg-10.0 | 10.0.13-1.el10_2 | ALSA-2026:86195 |
| AlmaLinux:8 | aspnetcore-runtime-dbg-10.0 | 10.0.13-1.el8_10 | ALSA-2026:86192 |
| AlmaLinux:9 | aspnetcore-runtime-dbg-10.0 | 10.0.13-1.el9_8 | ALSA-2026:86193 |
| AlmaLinux:10 | aspnetcore-runtime-dbg-8.0 | 8.0.32-1.el10_2 | ALSA-2026:86168 |
| AlmaLinux:8 | aspnetcore-runtime-dbg-8.0 | 8.0.32-2.el8_10 | ALSA-2026:86594 |
| AlmaLinux:9 | aspnetcore-runtime-dbg-8.0 | 8.0.32-1.el9_8 | ALSA-2026:86169 |
| AlmaLinux:10 | aspnetcore-runtime-dbg-9.0 | 9.0.21-1.el10_2 | ALSA-2026:86172 |
| AlmaLinux:8 | aspnetcore-runtime-dbg-9.0 | 9.0.21-1.el8_10 | ALSA-2026:86170 |
| AlmaLinux:9 | aspnetcore-runtime-dbg-9.0 | 9.0.21-1.el9_8 | ALSA-2026:86171 |
| AlmaLinux:10 | aspnetcore-targeting-pack-10.0 | 10.0.13-1.el10_2 | ALSA-2026:86195 |
| AlmaLinux:8 | aspnetcore-targeting-pack-10.0 | 10.0.13-1.el8_10 | ALSA-2026:86192 |
| AlmaLinux:9 | aspnetcore-targeting-pack-10.0 | 10.0.13-1.el9_8 | ALSA-2026:86193 |
| AlmaLinux:10 | aspnetcore-targeting-pack-8.0 | 8.0.32-1.el10_2 | ALSA-2026:86168 |
| AlmaLinux:8 | aspnetcore-targeting-pack-8.0 | 8.0.32-2.el8_10 | ALSA-2026:86594 |
| AlmaLinux:9 | aspnetcore-targeting-pack-8.0 | 8.0.32-1.el9_8 | ALSA-2026:86169 |
| AlmaLinux:10 | aspnetcore-targeting-pack-9.0 | 9.0.21-1.el10_2 | ALSA-2026:86172 |
| AlmaLinux:8 | aspnetcore-targeting-pack-9.0 | 9.0.21-1.el8_10 | ALSA-2026:86170 |
| AlmaLinux:9 | aspnetcore-targeting-pack-9.0 | 9.0.21-1.el9_8 | ALSA-2026:86171 |
| AlmaLinux:8 | dotnet | 10.0.113-1.el8_10 | ALSA-2026:86192 |
| AlmaLinux:10 | dotnet-apphost-pack-10.0 | 10.0.13-1.el10_2 | ALSA-2026:86195 |
| AlmaLinux:8 | dotnet-apphost-pack-10.0 | 10.0.13-1.el8_10 | ALSA-2026:86192 |
| AlmaLinux:9 | dotnet-apphost-pack-10.0 | 10.0.13-1.el9_8 | ALSA-2026:86193 |
| AlmaLinux:10 | dotnet-apphost-pack-8.0 | 8.0.32-1.el10_2 | ALSA-2026:86168 |
| AlmaLinux:8 | dotnet-apphost-pack-8.0 | 8.0.32-2.el8_10 | ALSA-2026:86594 |
| AlmaLinux:9 | dotnet-apphost-pack-8.0 | 8.0.32-1.el9_8 | ALSA-2026:86169 |
| AlmaLinux:10 | dotnet-apphost-pack-9.0 | 9.0.21-1.el10_2 | ALSA-2026:86172 |
| AlmaLinux:8 | dotnet-apphost-pack-9.0 | 9.0.21-1.el8_10 | ALSA-2026:86170 |
| AlmaLinux:9 | dotnet-apphost-pack-9.0 | 9.0.21-1.el9_8 | ALSA-2026:86171 |
| AlmaLinux:10 | dotnet-host | 10.0.13-1.el10_2 | ALSA-2026:86195 |
| AlmaLinux:9 | dotnet-host | 10.0.13-1.el9_8 | ALSA-2026:86193 |
| AlmaLinux:10 | dotnet-hostfxr-10.0 | 10.0.13-1.el10_2 | ALSA-2026:86195 |
| AlmaLinux:8 | dotnet-hostfxr-10.0 | 10.0.13-1.el8_10 | ALSA-2026:86192 |
| AlmaLinux:9 | dotnet-hostfxr-10.0 | 10.0.13-1.el9_8 | ALSA-2026:86193 |
| AlmaLinux:10 | dotnet-hostfxr-8.0 | 8.0.32-1.el10_2 | ALSA-2026:86168 |
| AlmaLinux:8 | dotnet-hostfxr-8.0 | 8.0.32-2.el8_10 | ALSA-2026:86594 |
| AlmaLinux:9 | dotnet-hostfxr-8.0 | 8.0.32-1.el9_8 | ALSA-2026:86169 |
| AlmaLinux:10 | dotnet-hostfxr-9.0 | 9.0.21-1.el10_2 | ALSA-2026:86172 |
| AlmaLinux:8 | dotnet-hostfxr-9.0 | 9.0.21-1.el8_10 | ALSA-2026:86170 |
| AlmaLinux:9 | dotnet-hostfxr-9.0 | 9.0.21-1.el9_8 | ALSA-2026:86171 |
| AlmaLinux:10 | dotnet-runtime-10.0 | 10.0.13-1.el10_2 | ALSA-2026:86195 |
| AlmaLinux:8 | dotnet-runtime-10.0 | 10.0.13-1.el8_10 | ALSA-2026:86192 |
| AlmaLinux:9 | dotnet-runtime-10.0 | 10.0.13-1.el9_8 | ALSA-2026:86193 |
| AlmaLinux:10 | dotnet-runtime-8.0 | 8.0.32-1.el10_2 | ALSA-2026:86168 |
| AlmaLinux:8 | dotnet-runtime-8.0 | 8.0.32-2.el8_10 | ALSA-2026:86594 |
| AlmaLinux:9 | dotnet-runtime-8.0 | 8.0.32-1.el9_8 | ALSA-2026:86169 |
| AlmaLinux:10 | dotnet-runtime-9.0 | 9.0.21-1.el10_2 | ALSA-2026:86172 |
| AlmaLinux:8 | dotnet-runtime-9.0 | 9.0.21-1.el8_10 | ALSA-2026:86170 |
| AlmaLinux:9 | dotnet-runtime-9.0 | 9.0.21-1.el9_8 | ALSA-2026:86171 |
| AlmaLinux:10 | dotnet-runtime-dbg-10.0 | 10.0.13-1.el10_2 | ALSA-2026:86195 |
| AlmaLinux:8 | dotnet-runtime-dbg-10.0 | 10.0.13-1.el8_10 | ALSA-2026:86192 |
| AlmaLinux:9 | dotnet-runtime-dbg-10.0 | 10.0.13-1.el9_8 | ALSA-2026:86193 |
| AlmaLinux:10 | dotnet-runtime-dbg-8.0 | 8.0.32-1.el10_2 | ALSA-2026:86168 |
| AlmaLinux:8 | dotnet-runtime-dbg-8.0 | 8.0.32-2.el8_10 | ALSA-2026:86594 |
| AlmaLinux:9 | dotnet-runtime-dbg-8.0 | 8.0.32-1.el9_8 | ALSA-2026:86169 |
| AlmaLinux:10 | dotnet-runtime-dbg-9.0 | 9.0.21-1.el10_2 | ALSA-2026:86172 |
| AlmaLinux:8 | dotnet-runtime-dbg-9.0 | 9.0.21-1.el8_10 | ALSA-2026:86170 |
| AlmaLinux:9 | dotnet-runtime-dbg-9.0 | 9.0.21-1.el9_8 | ALSA-2026:86171 |
| AlmaLinux:10 | dotnet-sdk-10.0 | 10.0.113-1.el10_2 | ALSA-2026:86195 |
| AlmaLinux:8 | dotnet-sdk-10.0 | 10.0.113-1.el8_10 | ALSA-2026:86192 |
| AlmaLinux:9 | dotnet-sdk-10.0 | 10.0.113-1.el9_8 | ALSA-2026:86193 |
| AlmaLinux:10 | dotnet-sdk-10.0-source-built-artifacts | 10.0.113-1.el10_2 | ALSA-2026:86195 |
| AlmaLinux:8 | dotnet-sdk-10.0-source-built-artifacts | 10.0.113-1.el8_10 | ALSA-2026:86192 |
| AlmaLinux:9 | dotnet-sdk-10.0-source-built-artifacts | 10.0.113-1.el9_8 | ALSA-2026:86193 |
| AlmaLinux:10 | dotnet-sdk-8.0 | 8.0.132-1.el10_2 | ALSA-2026:86168 |
| AlmaLinux:8 | dotnet-sdk-8.0 | 8.0.132-2.el8_10 | ALSA-2026:86594 |
| AlmaLinux:9 | dotnet-sdk-8.0 | 8.0.132-1.el9_8 | ALSA-2026:86169 |
| AlmaLinux:10 | dotnet-sdk-8.0-source-built-artifacts | 8.0.132-1.el10_2 | ALSA-2026:86168 |
| AlmaLinux:8 | dotnet-sdk-8.0-source-built-artifacts | 8.0.132-2.el8_10 | ALSA-2026:86594 |
| AlmaLinux:9 | dotnet-sdk-8.0-source-built-artifacts | 8.0.132-1.el9_8 | ALSA-2026:86169 |
| AlmaLinux:10 | dotnet-sdk-9.0 | 9.0.122-1.el10_2 | ALSA-2026:86172 |
| AlmaLinux:8 | dotnet-sdk-9.0 | 9.0.122-1.el8_10 | ALSA-2026:86170 |
| AlmaLinux:9 | dotnet-sdk-9.0 | 9.0.122-1.el9_8 | ALSA-2026:86171 |
| AlmaLinux:10 | dotnet-sdk-9.0-source-built-artifacts | 9.0.122-1.el10_2 | ALSA-2026:86172 |
| AlmaLinux:8 | dotnet-sdk-9.0-source-built-artifacts | 9.0.122-1.el8_10 | ALSA-2026:86170 |
| AlmaLinux:9 | dotnet-sdk-9.0-source-built-artifacts | 9.0.122-1.el9_8 | ALSA-2026:86171 |
| AlmaLinux:10 | dotnet-sdk-aot-10.0 | 10.0.113-1.el10_2 | ALSA-2026:86195 |
| AlmaLinux:8 | dotnet-sdk-aot-10.0 | 10.0.113-1.el8_10 | ALSA-2026:86192 |
| AlmaLinux:9 | dotnet-sdk-aot-10.0 | 10.0.113-1.el9_8 | ALSA-2026:86193 |
| AlmaLinux:10 | dotnet-sdk-aot-9.0 | 9.0.122-1.el10_2 | ALSA-2026:86172 |
| AlmaLinux:8 | dotnet-sdk-aot-9.0 | 9.0.122-1.el8_10 | ALSA-2026:86170 |
| AlmaLinux:9 | dotnet-sdk-aot-9.0 | 9.0.122-1.el9_8 | ALSA-2026:86171 |
| AlmaLinux:10 | dotnet-sdk-dbg-10.0 | 10.0.113-1.el10_2 | ALSA-2026:86195 |
| AlmaLinux:8 | dotnet-sdk-dbg-10.0 | 10.0.113-1.el8_10 | ALSA-2026:86192 |
| AlmaLinux:9 | dotnet-sdk-dbg-10.0 | 10.0.113-1.el9_8 | ALSA-2026:86193 |
| AlmaLinux:10 | dotnet-sdk-dbg-8.0 | 8.0.132-1.el10_2 | ALSA-2026:86168 |
| AlmaLinux:8 | dotnet-sdk-dbg-8.0 | 8.0.132-2.el8_10 | ALSA-2026:86594 |
| AlmaLinux:9 | dotnet-sdk-dbg-8.0 | 8.0.132-1.el9_8 | ALSA-2026:86169 |
| AlmaLinux:10 | dotnet-sdk-dbg-9.0 | 9.0.122-1.el10_2 | ALSA-2026:86172 |
| AlmaLinux:8 | dotnet-sdk-dbg-9.0 | 9.0.122-1.el8_10 | ALSA-2026:86170 |
| AlmaLinux:9 | dotnet-sdk-dbg-9.0 | 9.0.122-1.el9_8 | ALSA-2026:86171 |
| AlmaLinux:10 | dotnet-targeting-pack-10.0 | 10.0.13-1.el10_2 | ALSA-2026:86195 |
| AlmaLinux:8 | dotnet-targeting-pack-10.0 | 10.0.13-1.el8_10 | ALSA-2026:86192 |
| AlmaLinux:9 | dotnet-targeting-pack-10.0 | 10.0.13-1.el9_8 | ALSA-2026:86193 |
| AlmaLinux:10 | dotnet-targeting-pack-8.0 | 8.0.32-1.el10_2 | ALSA-2026:86168 |
| AlmaLinux:8 | dotnet-targeting-pack-8.0 | 8.0.32-2.el8_10 | ALSA-2026:86594 |
| AlmaLinux:9 | dotnet-targeting-pack-8.0 | 8.0.32-1.el9_8 | ALSA-2026:86169 |
| AlmaLinux:10 | dotnet-targeting-pack-9.0 | 9.0.21-1.el10_2 | ALSA-2026:86172 |
| AlmaLinux:8 | dotnet-targeting-pack-9.0 | 9.0.21-1.el8_10 | ALSA-2026:86170 |
| AlmaLinux:9 | dotnet-targeting-pack-9.0 | 9.0.21-1.el9_8 | ALSA-2026:86171 |
| AlmaLinux:10 | dotnet-templates-10.0 | 10.0.113-1.el10_2 | ALSA-2026:86195 |
| AlmaLinux:8 | dotnet-templates-10.0 | 10.0.113-1.el8_10 | ALSA-2026:86192 |
| AlmaLinux:9 | dotnet-templates-10.0 | 10.0.113-1.el9_8 | ALSA-2026:86193 |
| AlmaLinux:10 | dotnet-templates-8.0 | 8.0.132-1.el10_2 | ALSA-2026:86168 |
| AlmaLinux:8 | dotnet-templates-8.0 | 8.0.132-2.el8_10 | ALSA-2026:86594 |
| AlmaLinux:9 | dotnet-templates-8.0 | 8.0.132-1.el9_8 | ALSA-2026:86169 |
| AlmaLinux:10 | dotnet-templates-9.0 | 9.0.122-1.el10_2 | ALSA-2026:86172 |
| AlmaLinux:8 | dotnet-templates-9.0 | 9.0.122-1.el8_10 | ALSA-2026:86170 |
| AlmaLinux:9 | dotnet-templates-9.0 | 9.0.122-1.el9_8 | ALSA-2026:86171 |
| AlmaLinux:10 | netstandard-targeting-pack-2.1 | 9.0.122-1.el10_2 | ALSA-2026:86172 |
| AlmaLinux:8 | netstandard-targeting-pack-2.1 | 9.0.122-1.el8_10 | ALSA-2026:86170 |
| AlmaLinux:9 | netstandard-targeting-pack-2.1 | 9.0.122-1.el9_8 | ALSA-2026:86171 |
| Alpine:v3.23 | dotnet10-runtime | 10.0.13-r0 | ALPINE-CVE-2026-96958 |
| Alpine:v3.24 | dotnet10-runtime | 10.0.13-r0 | ALPINE-CVE-2026-96958 |
| Alpine:v3.22 | dotnet8-runtime | 8.0.32-r0 | ALPINE-CVE-2026-96958 |
| Alpine:v3.23 | dotnet8-runtime | 8.0.32-r0 | ALPINE-CVE-2026-96958 |
| Alpine:v3.24 | dotnet8-runtime | 8.0.32-r0 | ALPINE-CVE-2026-96958 |
| Alpine:v3.22 | dotnet9-runtime | 9.0.21-r0 | ALPINE-CVE-2026-96958 |
| Alpine:v3.23 | dotnet9-runtime | 9.0.21-r0 | ALPINE-CVE-2026-96958 |
| Alpine:v3.24 | dotnet9-runtime | 9.0.21-r0 | ALPINE-CVE-2026-96958 |
| NuGet | system.security.cryptography.xml | 9.0.21 | GHSA-r955-8q5j-3h83 |
| NuGet | system.security.cryptography.xml | 10.0.13 | GHSA-r955-8q5j-3h83 |
| NuGet | system.security.cryptography.xml | 11.0.0-rc.2 | GHSA-r955-8q5j-3h83 |
| NuGet | system.security.cryptography.xml | 8.0.5 | GHSA-r955-8q5j-3h83 |
| Ubuntu:24.04:LTS | dotnet10 | 10.0.113-10.0.13-0ubuntu1~24.04.1 | UBUNTU-CVE-2026-96958 |
| Ubuntu:24.04:LTS | dotnet10 | 10.0.113-10.0.13-0ubuntu1~24.04.1 | USN-8942-1 |
| Ubuntu:26.04:LTS | dotnet10 | 10.0.113-10.0.13-0ubuntu1~26.04.1 | USN-8942-1 |
| Ubuntu:26.04:LTS | dotnet10 | 10.0.113-10.0.13-0ubuntu1~26.04.1 | UBUNTU-CVE-2026-96958 |
| Ubuntu:26.10 | dotnet10 | 10.0.113-10.0.13-0ubuntu1~26.10.1 | USN-8942-1 |
| Ubuntu:26.10 | dotnet10 | 10.0.113-10.0.13-0ubuntu1~26.10.1 | UBUNTU-CVE-2026-96958 |
| Ubuntu:26.10 | dotnet11 | 11.0.100-11.0.0~rc2-0ubuntu1~26.10.1 | USN-8942-1 |
| Ubuntu:26.10 | dotnet11 | 11.0.100-11.0.0~rc2-0ubuntu1~26.10.1 | UBUNTU-CVE-2026-96958 |
| Ubuntu:22.04:LTS | dotnet6 | no fix listed | UBUNTU-CVE-2026-96958 |
| Ubuntu:22.04:LTS | dotnet7 | no fix listed | UBUNTU-CVE-2026-96958 |
| Ubuntu:22.04:LTS | dotnet8 | 8.0.132-8.0.32-0ubuntu1~22.04.1 | USN-8942-1 |
| Ubuntu:22.04:LTS | dotnet8 | 8.0.132-8.0.32-0ubuntu1~22.04.1 | UBUNTU-CVE-2026-96958 |
| Ubuntu:24.04:LTS | dotnet8 | 8.0.132-8.0.32-0ubuntu1~24.04.1 | UBUNTU-CVE-2026-96958 |
| Ubuntu:24.04:LTS | dotnet8 | 8.0.132-8.0.32-0ubuntu1~24.04.1 | USN-8942-1 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Microsoft | Microsoft .NET Framework 3.5 | 3.5.0 – before 2.0.50727.9188 AND 3.0.30729.9171 |
| Microsoft | Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2 | 3.0.0.0 – before 2.0.50727.8987 AND 3.0.30729.8982 AND 4.7.4150.0 |
| Microsoft | Microsoft .NET Framework 3.5 AND 4.7.2 | 4.7.0 – before 2.0.50727.9073 AND 3.0.30729.9070 AND 4.7.4150.0 |
| Microsoft | Microsoft .NET Framework 3.5 AND 4.8 | 4.8.0 – before 2.0.50727.9073 AND 3.0.30729.9070 AND 4.8.4811.0 |
| Microsoft | Microsoft .NET Framework 3.5 AND 4.8.1 | 4.8.1 – before 2.0.50727.9188 AND 3.0.30729.9171 AND 4.8.9363.0 |
| Microsoft | Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2 | 4.7.0 – before 4.7.4150.0 |
| Microsoft | Microsoft .NET Framework 4.8 | 4.8.0 – before 4.8.4811.0 |
| Microsoft | Microsoft .NET Framework 4.8.1 | 4.8.0.0 – before 4.8.9363.0 |
| Microsoft | System.Security.Cryptography.Xml | 10.0.0 – before 10.0.13 |
Weakness: CWE-407 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C
References
- .NET Denial of Service Vulnerability vendor-advisory, patch