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.NET NuGet

CVE-2026-26130

HIGH

CVE-2026-26130 is a high-severity (CVSS 7.5) CWE-770 vulnerability in Microsoft.AspNetCore.App.Runtime.linux-arm. O3 Security confirms whether CVE-2026-26130 is actually reachable in your code before you act, and blocks exploitation at runtime until you patch.

.NET Denial of Service Vulnerability

Also known asBIT-aspnet-core-2026-26130GHSA-4vgm-c2wm-63mw
Published
Mar 10, 2026
Updated
Jul 22, 2026
Affected
36 pkgs
Patched
36 / 36
Exploits
None indexed

Blast Radius

36 pkgs affected
.NETMicrosoft.AspNetCore.App.Runtime.linux-arm.NETMicrosoft.AspNetCore.App.Runtime.linux-arm.NETMicrosoft.AspNetCore.App.Runtime.linux-arm.NETMicrosoft.AspNetCore.App.Runtime.linux-arm64.NETMicrosoft.AspNetCore.App.Runtime.linux-arm64.NETMicrosoft.AspNetCore.App.Runtime.linux-arm64.NETMicrosoft.AspNetCore.App.Runtime.linux-musl-arm.NETMicrosoft.AspNetCore.App.Runtime.linux-musl-arm+28 more

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects NuGet packages — download data is not available via public APIs for these ecosystems.

Description

Allocation of resources without limits or throttling in ASP.NET Core allows an unauthorized attacker to deny service over a network.

Affected Packages

36 total 36 fixed
EcosystemPackageVulnerable rangeFix
.NETNuGetMicrosoft.AspNetCore.App.Runtime.linux-arm8.0.0&&< 8.0.258.0.25
.NETNuGetMicrosoft.AspNetCore.App.Runtime.linux-arm9.0.0&&< 9.0.149.0.14
.NETNuGetMicrosoft.AspNetCore.App.Runtime.linux-arm10.0.0&&< 10.0.410.0.4
.NETNuGetMicrosoft.AspNetCore.App.Runtime.linux-arm648.0.0&&< 8.0.258.0.25
.NETNuGetMicrosoft.AspNetCore.App.Runtime.linux-arm649.0.0&&< 9.0.149.0.14
.NETNuGetMicrosoft.AspNetCore.App.Runtime.linux-arm6410.0.0&&< 10.0.410.0.4

Detection & mitigation playbook

Open-source dependency
  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for Microsoft.AspNetCore.App.Runtime.linux-arm. O3's reachability analysis confirms whether the vulnerable code path is actually invoked in your application, so you act on real exposure instead of every transitive match.

  2. Fix

    Update Microsoft.AspNetCore.App.Runtime.linux-arm to 8.0.25 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2026-26130 is resolved across your whole dependency graph.

  3. Workarounds

    If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

  4. How O3 protects you

    O3 pinpoints whether CVE-2026-26130 is reachable in your code and exactly where to fix it, then blocks exploitation in production at runtime until the patched version is deployed.

Tailored to CVE-2026-26130. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.

Frequently Asked Questions

Allocation of resources without limits or throttling in ASP.NET Core allows an unauthorized attacker to deny service over a network.
O3 Security · Impact-Aware SCA

Is CVE-2026-26130 in your dependencies?

O3 detects CVE-2026-26130 across NuGet dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.