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Microsoft Security Advisory CVE-2026-42899 – ASP.NET Core Denial of Service Vulnerability

Microsoft Security Advisory CVE-2026-42899 – ASP.NET Core Denial of Service Vulnerability

CVE-2026-42899Published 4 months agoUpdated 5 days agoSource: OSV

Affected packages

  • Microsoft.AspNetCore.App.Runtime.linux-arm— 8.0.0 → 8.0.27
  • Microsoft.AspNetCore.App.Runtime.linux-arm64— 8.0.0 → 8.0.27
  • Microsoft.AspNetCore.App.Runtime.linux-musl-arm— 8.0.0 → 8.0.27
  • Microsoft.AspNetCore.App.Runtime.linux-musl-arm64— 8.0.0 → 8.0.27
  • Microsoft.AspNetCore.App.Runtime.linux-musl-x64— 8.0.0 → 8.0.27
  • Microsoft.AspNetCore.App.Runtime.linux-x64— 8.0.0 → 8.0.27
  • Microsoft.AspNetCore.App.Runtime.osx-arm64— 8.0.0 → 8.0.27
  • Microsoft.AspNetCore.App.Runtime.osx-x64— 8.0.0 → 8.0.27
  • Microsoft.AspNetCore.App.Runtime.win-arm— 8.0.0 → 8.0.27
  • Microsoft.AspNetCore.App.Runtime.win-arm64— 8.0.0 → 8.0.27
  • Microsoft.AspNetCore.App.Runtime.win-x64— 8.0.0 → 8.0.27
  • Microsoft.AspNetCore.App.Runtime.win-x86— 8.0.0 → 8.0.27

Exploit signal

Known exploited (CISA KEV)
No
EPSS score
—
EPSS percentile
—

EPSS is the probability a CVE is exploited in the wild; percentile is its rank among all CVEs.

Sources

Structured record: https://osv.dev/vulnerability/GHSA-9v76-4qcc-frgh

Recommended response stack

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Microsoft Security Advisory CVE-2026-42899 – ASP.NET Core Denial of Service Vulnerability | HackTribune