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Advisory record · GHSA-4vgm-c2wm-63mw

.NET Denial of Service Vulnerability

CVSS 7.5 HighEPSS 0.032 · 88th percentile

Published by the GitHub Advisory Database at 11 Mar 2026, 21:11 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
Microsoft.AspNetCore.App.Runtime.linux-armNuGet>=8.0.0, <8.0.25 || >=9.0.0, <9.0.14 || >=10.0.0, <10.0.48.0.25, 9.0.14, 10.0.4
Microsoft.AspNetCore.App.Runtime.linux-arm64NuGet>=8.0.0, <8.0.25 || >=9.0.0, <9.0.14 || >=10.0.0, <10.0.48.0.25, 9.0.14, 10.0.4
Microsoft.AspNetCore.App.Runtime.linux-musl-armNuGet>=8.0.0, <8.0.25 || >=9.0.0, <9.0.14 || >=10.0.0, <10.0.48.0.25, 9.0.14, 10.0.4
Microsoft.AspNetCore.App.Runtime.linux-musl-arm64NuGet>=8.0.0, <8.0.25 || >=9.0.0, <9.0.14 || >=10.0.0, <10.0.48.0.25, 9.0.14, 10.0.4
Microsoft.AspNetCore.App.Runtime.linux-musl-x64NuGet>=8.0.0, <8.0.25 || >=9.0.0, <9.0.14 || >=10.0.0, <10.0.48.0.25, 9.0.14, 10.0.4
Microsoft.AspNetCore.App.Runtime.linux-x64NuGet>=8.0.0, <8.0.25 || >=9.0.0, <9.0.14 || >=10.0.0, <10.0.48.0.25, 9.0.14, 10.0.4
Microsoft.AspNetCore.App.Runtime.osx-arm64NuGet>=8.0.0, <8.0.25 || >=9.0.0, <9.0.14 || >=10.0.0, <10.0.48.0.25, 9.0.14, 10.0.4
Microsoft.AspNetCore.App.Runtime.osx-x64NuGet>=8.0.0, <8.0.25 || >=9.0.0, <9.0.14 || >=10.0.0, <10.0.48.0.25, 9.0.14, 10.0.4
Microsoft.AspNetCore.App.Runtime.win-armNuGet>=8.0.0, <8.0.25 || >=9.0.0, <9.0.14 || >=10.0.0, <10.0.48.0.25, 9.0.14, 10.0.4
Microsoft.AspNetCore.App.Runtime.win-arm64NuGet>=8.0.0, <8.0.25 || >=9.0.0, <9.0.14 || >=10.0.0, <10.0.48.0.25, 9.0.14, 10.0.4
Microsoft.AspNetCore.App.Runtime.win-x64NuGet>=8.0.0, <8.0.25 || >=9.0.0, <9.0.14 || >=10.0.0, <10.0.48.0.25, 9.0.14, 10.0.4
Microsoft.AspNetCore.App.Runtime.win-x86NuGet>=8.0.0, <8.0.25 || >=9.0.0, <9.0.14 || >=10.0.0, <10.0.48.0.25, 9.0.14, 10.0.4
Identifiers
GHSA-4vgm-c2wm-63mw · BIT-aspnet-core-2026-26130 · CVE-2026-26130
Weakness (CWE)
CWE-770
Tags
Published
11 Mar 2026
Updated
10 Sept 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

The Microsoft.AspNetCore.App.Runtime packages for linux, linux-musl, osx and win (arm, arm64, x64, x86 variants) are affected in .NET 8.0 before 8.0.25, .NET 9.0 before 9.0.14, and .NET 10.0 before 10.0.4. A remote attacker can send a specially crafted message to a SignalR server without authentication, exhausting an internal buffer and causing a denial of service. Upgrade to 8.0.25, 9.0.14, or 10.0.4, as appropriate for your .NET version.

Written 9 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
7.5 High 3.1 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 CNA (microsoft)
  • CISA KEV Not listed.
  • EPSS 0.032, the 88th percentile, on 10 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 10 Mar 2026, 19:03 UTC Published by the maintainers as a GitHub repository advisory
  2. 31 Oct 2026, 15:21 UTC First seen by agentprime
  3. 31 Oct 2026, 15:21 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.