# CVE-2026-69651: .NET Denial of Service Vulnerability > An attacker can cause a denial of service in .NET applications due to inefficient algorithmic complexity. - **Severity:** High 7.5 (`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`) - **Exploited in the wild:** Not known - **Login needed:** Not needed - **Attackable:** Over the internet - **Victim action needed:** Not needed - **Fix available:** Yes - **Published:** 13 Oct 2026 - **Updated:** 29 Oct 2026 - **Also known as:** GHSA-3rxq-g8rj-r2cf, UBUNTU-CVE-2026-69651 ## What is CVE-2026-69651? CVE-2026-69651 is a high-severity denial of service vulnerability in Microsoft .NET 10.0 runtime, published on 13 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim. ### Official description Inefficient algorithmic complexity in .NET allows an unauthorized attacker to deny service over a network. Weakness: CWE-407 (Inefficient Algorithmic Complexity) ## Which versions are affected by CVE-2026-69651? 40 open source packages ship an affected version, including Microsoft.NETCore.App.Runtime.linux-arm, Microsoft.NETCore.App.Runtime.linux-arm64 and Microsoft.NETCore.App.Runtime.linux-musl-arm. | Package | Ecosystem | Affected | Fixed in | | --- | --- | --- | --- | | `Microsoft.NETCore.App.Runtime.linux-arm` | NuGet | From 10.0.0 | 10.0.13 | | `Microsoft.NETCore.App.Runtime.linux-arm` | NuGet | From 10.0.0 | 10.0.13 | | `Microsoft.NETCore.App.Runtime.linux-arm` | NuGet | From 11.0.0-preview.1 | 11.0.0-rc.2 | | `Microsoft.NETCore.App.Runtime.linux-arm` | NuGet | From 11.0.0-preview.1 | 11.0.0-rc.2 | | `Microsoft.NETCore.App.Runtime.linux-arm` | NuGet | From 8.0.0 | 8.0.32 | | `Microsoft.NETCore.App.Runtime.linux-arm` | NuGet | From 8.0.0 | 8.0.32 | | `Microsoft.NETCore.App.Runtime.linux-arm` | NuGet | From 9.0.0 | 9.0.21 | | `Microsoft.NETCore.App.Runtime.linux-arm` | NuGet | From 9.0.0 | 9.0.21 | | `Microsoft.NETCore.App.Runtime.linux-arm64` | NuGet | From 10.0.0 | 10.0.13 | | `Microsoft.NETCore.App.Runtime.linux-arm64` | NuGet | From 10.0.0 | 10.0.13 | | `Microsoft.NETCore.App.Runtime.linux-arm64` | NuGet | From 11.0.0-preview.1 | 11.0.0-rc.2 | | `Microsoft.NETCore.App.Runtime.linux-arm64` | NuGet | From 11.0.0-preview.1 | 11.0.0-rc.2 | | `Microsoft.NETCore.App.Runtime.linux-arm64` | NuGet | From 8.0.0 | 8.0.32 | | `Microsoft.NETCore.App.Runtime.linux-arm64` | NuGet | From 8.0.0 | 8.0.32 | | `Microsoft.NETCore.App.Runtime.linux-arm64` | NuGet | From 9.0.0 | 9.0.21 | | `Microsoft.NETCore.App.Runtime.linux-arm64` | NuGet | From 9.0.0 | 9.0.21 | | `Microsoft.NETCore.App.Runtime.linux-musl-arm` | NuGet | From 10.0.0 | 10.0.13 | | `Microsoft.NETCore.App.Runtime.linux-musl-arm` | NuGet | From 10.0.0 | 10.0.13 | | `Microsoft.NETCore.App.Runtime.linux-musl-arm` | NuGet | From 11.0.0-preview.1 | 11.0.0-rc.2 | | `Microsoft.NETCore.App.Runtime.linux-musl-arm` | NuGet | From 11.0.0-preview.1 | 11.0.0-rc.2 | | `Microsoft.NETCore.App.Runtime.linux-musl-arm` | NuGet | From 8.0.0 | 8.0.32 | | `Microsoft.NETCore.App.Runtime.linux-musl-arm` | NuGet | From 8.0.0 | 8.0.32 | | `Microsoft.NETCore.App.Runtime.linux-musl-arm` | NuGet | From 9.0.0 | 9.0.21 | | `Microsoft.NETCore.App.Runtime.linux-musl-arm` | NuGet | From 9.0.0 | 9.0.21 | | `Microsoft.NETCore.App.Runtime.linux-musl-arm64` | NuGet | From 10.0.0 | 10.0.13 | | `Microsoft.NETCore.App.Runtime.linux-musl-arm64` | NuGet | From 10.0.0 | 10.0.13 | | `Microsoft.NETCore.App.Runtime.linux-musl-arm64` | NuGet | From 11.0.0-preview.1 | 11.0.0-rc.2 | | `Microsoft.NETCore.App.Runtime.linux-musl-arm64` | NuGet | From 11.0.0-preview.1 | 11.0.0-rc.2 | | `Microsoft.NETCore.App.Runtime.linux-musl-arm64` | NuGet | From 8.0.0 | 8.0.32 | | `Microsoft.NETCore.App.Runtime.linux-musl-arm64` | NuGet | From 8.0.0 | 8.0.32 | | `Microsoft.NETCore.App.Runtime.linux-musl-arm64` | NuGet | From 9.0.0 | 9.0.21 | | `Microsoft.NETCore.App.Runtime.linux-musl-arm64` | NuGet | From 9.0.0 | 9.0.21 | | `Microsoft.NETCore.App.Runtime.linux-musl-x64` | NuGet | From 10.0.0 | 10.0.13 | | `Microsoft.NETCore.App.Runtime.linux-musl-x64` | NuGet | From 10.0.0 | 10.0.13 | | `Microsoft.NETCore.App.Runtime.linux-musl-x64` | NuGet | From 11.0.0-preview.1 | 11.0.0-rc.2 | | `Microsoft.NETCore.App.Runtime.linux-musl-x64` | NuGet | From 11.0.0-preview.1 | 11.0.0-rc.2 | | `Microsoft.NETCore.App.Runtime.linux-musl-x64` | NuGet | From 8.0.0 | 8.0.32 | | `Microsoft.NETCore.App.Runtime.linux-musl-x64` | NuGet | From 8.0.0 | 8.0.32 | | `Microsoft.NETCore.App.Runtime.linux-musl-x64` | NuGet | From 9.0.0 | 9.0.21 | | `Microsoft.NETCore.App.Runtime.linux-musl-x64` | NuGet | From 9.0.0 | 9.0.21 | ## How do I fix CVE-2026-69651? Upgrade Microsoft.NETCore.App.Runtime.linux-arm to a fixed version for your release line: 10.0.13, 11.0.0-rc.2, 8.0.32 or 9.0.21. ## Is CVE-2026-69651 being exploited? There is no known exploitation of CVE-2026-69651 in the wild and no public exploit code. ## Fix prompt for AI coding agents ```text Check this codebase for CVE-2026-69651 and fix it if it is affected. What it is: CVE-2026-69651 is a high-severity denial of service vulnerability in Microsoft .NET 10.0 runtime, published on 13 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim. Exploitation: There is no known exploitation of CVE-2026-69651 in the wild and no public exploit code. Affected packages and fixed versions: - Microsoft.NETCore.App.Runtime.linux-arm (NuGet): affected from 10.0.0; fixed in 10.0.13 - Microsoft.NETCore.App.Runtime.linux-arm (NuGet): affected from 10.0.0; fixed in 10.0.13 - Microsoft.NETCore.App.Runtime.linux-arm (NuGet): affected from 11.0.0-preview.1; fixed in 11.0.0-rc.2 - Microsoft.NETCore.App.Runtime.linux-arm (NuGet): affected from 11.0.0-preview.1; fixed in 11.0.0-rc.2 - Microsoft.NETCore.App.Runtime.linux-arm (NuGet): affected from 8.0.0; fixed in 8.0.32 - Microsoft.NETCore.App.Runtime.linux-arm (NuGet): affected from 8.0.0; fixed in 8.0.32 - Microsoft.NETCore.App.Runtime.linux-arm (NuGet): affected from 9.0.0; fixed in 9.0.21 - Microsoft.NETCore.App.Runtime.linux-arm (NuGet): affected from 9.0.0; fixed in 9.0.21 - Microsoft.NETCore.App.Runtime.linux-arm64 (NuGet): affected from 10.0.0; fixed in 10.0.13 - Microsoft.NETCore.App.Runtime.linux-arm64 (NuGet): affected from 10.0.0; fixed in 10.0.13 - Microsoft.NETCore.App.Runtime.linux-arm64 (NuGet): affected from 11.0.0-preview.1; fixed in 11.0.0-rc.2 - Microsoft.NETCore.App.Runtime.linux-arm64 (NuGet): affected from 11.0.0-preview.1; fixed in 11.0.0-rc.2 Task: 1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies. 2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it. 3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead. 4. Run the tests and summarise what changed and why. 5. If nothing in the project is affected, say so and change nothing. Reference: https://insights.sbomify.com/CVE-2026-69651/ (Markdown: https://insights.sbomify.com/CVE-2026-69651/index.md) ``` ## Sources - CVE record: https://www.cve.org/CVERecord?id=CVE-2026-69651 - NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-69651 - OSV: https://osv.dev/vulnerability/CVE-2026-69651 --- From sbomify Insights: https://insights.sbomify.com/CVE-2026-69651/ Summaries are generated and may contain mistakes; the official description above is the record.