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TI-2026-48640 Aliases CVE-2026-69304GHSA-8cp2-47hg-mfgh

ASP.NET Core Denial of Service Vulnerability

Priority LOW 28CWE-409Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
High
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA, GitHub, Red Hat and Microsoft. Impact type from Microsoft.

Summary

Improper handling of highly compressed data (data amplification) in ASP.NET Core allows an unauthorized attacker to deny service over a network.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00855 58th percentileScored 2026-11-07
Fix Fixed Microsoft.AspNetCore.Server.IISIntegration (NuGet): 11.0.0-rc.1, 8.0.31, 9.0.20 +1Red Hat: 3 advisoriesMicrosoft: 3 updates

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
Microsoft.NET 10.0 runtime10.0.0 to before 10.0.1210.0.12Patch availableCNA
Microsoft.NET 8.0 runtime8.0.0 to before 8.0.318.0.31Patch availableCNA
Microsoft.NET 9.0 runtime9.0.0 to before 9.0.209.0.20Patch availableCNA
MicrosoftASP.NET Core 10.010.0 to before 10.0.1210.0.12Patch availableCNA
MicrosoftASP.NET Core 11.011.0 to before 11.0 RC111.0 RC1Patch availableCNA
MicrosoftASP.NET Core 8.08.0 to before 8.0.318.0.31Patch availableCNA
MicrosoftASP.NET Core 9.09.0 to before 9.0.209.0.20Patch availableCNA
MicrosoftMicrosoft Visual Studio 2022 version 17.1417.14.0 to before 17.14.4017.14.40Patch availableCNA
MicrosoftMicrosoft Visual Studio 2026 version 18.918.9.0 to before 18.9.318.9.3Patch availableCNA
—Microsoft.AspNetCore.Server.IISIntegration (NuGet)11.0.0-preview.1 to before 11.0.0-rc.111.0.0-rc.1Patch availableGHSA-8cp2-47hg-mfgh
—Microsoft.AspNetCore.Server.IISIntegration (NuGet)8.0.0 to before 8.0.318.0.31Patch availableGHSA-8cp2-47hg-mfgh
—Microsoft.AspNetCore.Server.IISIntegration (NuGet)9.0.0 to before 9.0.209.0.20Patch availableGHSA-8cp2-47hg-mfgh
—Microsoft.AspNetCore.Server.IISIntegration (NuGet)10.0.0 to before 10.0.1210.0.12Patch availableGHSA-8cp2-47hg-mfgh
  • .NET 10.0 runtime VendorMicrosoft Affected 10.0.0 to before 10.0.12 Fixed in 10.0.12 Patch available CNA
  • .NET 8.0 runtime VendorMicrosoft Affected 8.0.0 to before 8.0.31 Fixed in 8.0.31 Patch available CNA
  • .NET 9.0 runtime VendorMicrosoft Affected 9.0.0 to before 9.0.20 Fixed in 9.0.20 Patch available CNA
  • ASP.NET Core 10.0 VendorMicrosoft Affected 10.0 to before 10.0.12 Fixed in 10.0.12 Patch available CNA
  • ASP.NET Core 11.0 VendorMicrosoft Affected 11.0 to before 11.0 RC1 Fixed in 11.0 RC1 Patch available CNA
  • ASP.NET Core 8.0 VendorMicrosoft Affected 8.0 to before 8.0.31 Fixed in 8.0.31 Patch available CNA
  • ASP.NET Core 9.0 VendorMicrosoft Affected 9.0 to before 9.0.20 Fixed in 9.0.20 Patch available CNA
  • Microsoft Visual Studio 2022 version 17.14 VendorMicrosoft Affected 17.14.0 to before 17.14.40 Fixed in 17.14.40 Patch available CNA
  • Microsoft Visual Studio 2026 version 18.9 VendorMicrosoft Affected 18.9.0 to before 18.9.3 Fixed in 18.9.3 Patch available CNA
  • Microsoft.AspNetCore.Server.IISIntegration (NuGet) Vendor— Affected 11.0.0-preview.1 to before 11.0.0-rc.1 Fixed in 11.0.0-rc.1 Patch available GHSA-8cp2-47hg-mfgh
  • Microsoft.AspNetCore.Server.IISIntegration (NuGet) Vendor— Affected 8.0.0 to before 8.0.31 Fixed in 8.0.31 Patch available GHSA-8cp2-47hg-mfgh
  • Microsoft.AspNetCore.Server.IISIntegration (NuGet) Vendor— Affected 9.0.0 to before 9.0.20 Fixed in 9.0.20 Patch available GHSA-8cp2-47hg-mfgh
  • Microsoft.AspNetCore.Server.IISIntegration (NuGet) Vendor— Affected 10.0.0 to before 10.0.12 Fixed in 10.0.12 Patch available GHSA-8cp2-47hg-mfgh

CPE configurations NVD · 6

CPEVersionsRoleVendor
cpe:2.3:a:microsoft:asp.net_core:*:*:*:*:*:*:*:*8.0.0 to before 8.0.28; 9.0.0 to before 9.0.17; 10.0.0 to before 10.0.9; after 11.0.0VulnerableMicrosoft
cpe:2.3:a:microsoft:asp.net_core:11.0:rc1:*:*:*:*:*:*11.0 rc1VulnerableMicrosoft
cpe:2.3:a:microsoft:visual_studio_2022:*:*:*:*:*:*:*:*17.14.0 to before 17.14.40VulnerableMicrosoft
cpe:2.3:a:microsoft:visual_studio_2026:*:*:*:*:*:*:*:*18.9.0 to before 18.9.3VulnerableMicrosoft
cpe:2.3:a:microsoft:.net:*:*:*:*:*:*:*:*8.0.0 to before 8.0.31; 9.0.0 to before 9.0.20; 10.0.0 to before 10.0.12VulnerableMicrosoft
cpe:2.3:o:microsoft:windows:-:*:*:*:*:*:*:*not specified by NVDRunning onMicrosoft
  • cpe:2.3:a:microsoft:asp.net_core:*:*:*:*:*:*:*:* Versions 8.0.0 to before 8.0.28; 9.0.0 to before 9.0.17; 10.0.0 to before 10.0.9; after 11.0.0 Vulnerable ·Microsoft
  • cpe:2.3:a:microsoft:asp.net_core:11.0:rc1:*:*:*:*:*:* Versions 11.0 rc1 Vulnerable ·Microsoft
  • cpe:2.3:a:microsoft:visual_studio_2022:*:*:*:*:*:*:*:* Versions 17.14.0 to before 17.14.40 Vulnerable ·Microsoft
  • cpe:2.3:a:microsoft:visual_studio_2026:*:*:*:*:*:*:*:* Versions 18.9.0 to before 18.9.3 Vulnerable ·Microsoft
  • cpe:2.3:a:microsoft:.net:*:*:*:*:*:*:*:* Versions 8.0.0 to before 8.0.31; 9.0.0 to before 9.0.20; 10.0.0 to before 10.0.12 Vulnerable ·Microsoft
  • cpe:2.3:o:microsoft:windows:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Microsoft

Remediation

  • Fix · GHSA-8cp2-47hg-mfgh Microsoft.AspNetCore.Server.IISIntegration (NuGet) Fixed in 11.0.0-rc.1 Advisory →
  • Fix · GHSA-8cp2-47hg-mfgh Microsoft.AspNetCore.Server.IISIntegration (NuGet) Fixed in 8.0.31 Advisory →
  • Fix · GHSA-8cp2-47hg-mfgh Microsoft.AspNetCore.Server.IISIntegration (NuGet) Fixed in 9.0.20 Advisory →
  • Fix · GHSA-8cp2-47hg-mfgh Microsoft.AspNetCore.Server.IISIntegration (NuGet) Fixed in 10.0.12 Advisory →

Red Hat 3 advisories

  • RHSA-2026:74950 Released 2026-10-02 · Red Hat rating Moderate
    Red Hat Hardened Images RPMs Security Update
    • Red Hat Hardened Images aspnetcore-runtime-8.0-8.0.30-0.2.hum1@aarch64, aspnetcore-runtime-8.0-8.0.30-0.2.hum1@x86_64, aspnetcore-runtime-dbg-8.0-8.0.30-0.2.hum1@aarch64 +22
  • RHSA-2026:74947 Released 2026-10-02 · Red Hat rating Moderate
    Red Hat Hardened Images RPMs Security Update
    • Red Hat Hardened Images aspnetcore-runtime-9.0-9.0.18-2.1.hum1@aarch64, aspnetcore-runtime-9.0-9.0.18-2.1.hum1@x86_64, aspnetcore-runtime-dbg-9.0-9.0.18-2.1.hum1@aarch64 +26
  • RHSA-2026:66863 Released 2026-09-12 · Red Hat rating Important
    Red Hat Hardened Images RPMs bug fix and enhancement update
    • Red Hat Hardened Images dotnet-sdk-10.0-10.0.112-1.hum1@aarch64, dotnet-sdk-10.0-10.0.112-1.hum1@x86_64, dotnet-sdk-10.0-source-built-artifacts-10.0.112-1.hum1@aarch64 +8

Microsoft 3 updates

  • KB5126106
    Security Update
    • .NET 10.0 installed on Linux 10.0.111, 10.0.400
    • .NET 10.0 installed on Mac OS 10.0.111, 10.0.400
    • .NET 10.0 installed on Windows 10.0.111, 10.0.400
    • ASP.NET Core 10.0 10.0.12
  • KB5126105
    Security Update
    • .NET 9.0 installed on Linux 9.0.120, 9.0.317
    • .NET 9.0 installed on Mac OS 9.0.120, 9.0.317
    • .NET 9.0 installed on Windows 9.0.120, 9.0.317, 9.0.20
    • ASP.NET Core 9.0 9.0.20
  • KB5126104
    Security Update
    • .NET 8.0 installed on Linux 8.0.130, 8.0.424
    • .NET 8.0 installed on Mac OS 8.0.130, 8.0.424
    • .NET 8.0 installed on Windows 8.0.130, 8.0.424
    • ASP.NET Core 8.0 8.0.31

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Hardened ImagesFixed RHSA-2026:66863, RHSA-2026:74947, RHSA-2026:74950
Not affected: 1 product
  • Red Hat Hardened Images

Microsoft

Microsoft's page for this CVE →

Impact
Denial of Service
Exploited
No
Publicly disclosed
No
Exploitability
Exploitation Less Likely
ProductStatusPlan or fix
.NET 10.0 installed on WindowsFixed 10.0.12 · Security Update
.NET 8.0 installed on WindowsFixed 8.0.31 · Security Update
.NET 9.0 installed on WindowsFixed 9.0.20 · Security Update
ASP.NET Core 11.0Fixed11.0 RC1 Security Update
Microsoft Visual Studio 2022 version 17.14Fixed 17.14.40 · Security Update
Microsoft Visual Studio 2026 version 18.9Fixed 18.9.3 · Security Update

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-69304
  2. 2026-10-03 Alias added: GHSA-8cp2-47hg-mfgh
  3. 2026-10-20 Fix available: RHSA-2026:74947 · Red Hat
  4. 2026-10-20 Fix available: RHSA-2026:74950 · Red Hat
  5. 2026-10-20 Fix available: RHSA-2026:66863 · Red Hat
  6. 2026-10-20 Fix available: Red Hat Hardened Images · Red Hat
  7. 2026-10-20 CVSS score added · Red Hat
  8. 2026-10-30 Fix available: Microsoft/.NET 10.0 [email protected], Microsoft/.NET 8.0 [email protected], Microsoft/.NET 9.0 [email protected] · CNA

References

Patch 1

Advisory 1

Other 2

  • TI-2026-79288 Out-of-bounds write in Google Brotli decoder KEVCVSS 4.0CRITICAL 9.2
  • TI-2023-23979 The HTTP/2 protocol allows a denial of service (server resource consumption) because… KEVCVSS 3.1HIGH 7.5
  • TI-2023-19596 .NET and Visual Studio Denial of Service Vulnerability KEVCVSS 3.1HIGH 7.5
  • TI-2023-19588 Microsoft QUIC Denial of Service Vulnerability CVSS 3.1HIGH 7.5
  • TI-2024-14152 .NET and Visual Studio Denial of Service Vulnerability CVSS 3.1HIGH 7.5
  • TI-2021-08380 .NET Core Remote Code Execution Vulnerability CVSS 3.1CRITICAL 9.8
See all 129 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences