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TI-2026-44957 Aliases CVE-2026-62898GHSA-c494-m2fq-59mx

Microsoft QUIC Information Disclosure Vulnerability

Priority MEDIUM 41CWE-416Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Information disclosure
Confidentiality · integrity · availability
High · None · None
Fix status
Fixed

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

Summary

Use after free in Microsoft QUIC allows an unauthorized attacker to disclose information over a network.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.01027 63rd percentileScored 2026-11-07
Fix Fixed Microsoft.NETCore.App.Runtime.win-arm64 (NuGet): 10.0.11, 9.0.19, 8.0.30Microsoft.NETCore.App.Runtime.win-x64 (NuGet): 10.0.11, 9.0.19, 8.0.30+1 more productMicrosoft: 3 updates

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
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 10.0.1110.0.11Patch availableCNA
Microsoft.NET 8.0 runtime8.0.0 to before 8.0.308.0.30Patch availableCNA
Microsoft.NET 9.0 runtime9.0.0 to before 9.0.199.0.19Patch availableCNA
MicrosoftMicrosoft Visual Studio 2022 version 17.1417.14.0 to before 17.14.3817.14.38Patch availableCNA
MicrosoftMicrosoft Visual Studio 2026 version 18.818.0 to before 18.8.318.8.3Patch availableCNA
—Microsoft.NETCore.App.Runtime.win-arm64 (NuGet)10.0.0 to before 10.0.1110.0.11Patch availableGHSA-c494-m2fq-59mx
—Microsoft.NETCore.App.Runtime.win-x64 (NuGet)10.0.0 to before 10.0.1110.0.11Patch availableGHSA-c494-m2fq-59mx
—Microsoft.NETCore.App.Runtime.win-x86 (NuGet)10.0.0 to before 10.0.1110.0.11Patch availableGHSA-c494-m2fq-59mx
—Microsoft.NETCore.App.Runtime.win-arm64 (NuGet)9.0.0 to before 9.0.199.0.19Patch availableGHSA-c494-m2fq-59mx
—Microsoft.NETCore.App.Runtime.win-x64 (NuGet)9.0.0 to before 9.0.199.0.19Patch availableGHSA-c494-m2fq-59mx
—Microsoft.NETCore.App.Runtime.win-x86 (NuGet)9.0.0 to before 9.0.199.0.19Patch availableGHSA-c494-m2fq-59mx
—Microsoft.NETCore.App.Runtime.win-arm64 (NuGet)8.0.0 to before 8.0.308.0.30Patch availableGHSA-c494-m2fq-59mx
—Microsoft.NETCore.App.Runtime.win-x64 (NuGet)8.0.0 to before 8.0.308.0.30Patch availableGHSA-c494-m2fq-59mx
—Microsoft.NETCore.App.Runtime.win-x86 (NuGet)8.0.0 to before 8.0.308.0.30Patch availableGHSA-c494-m2fq-59mx
  • .NET 10.0 runtime VendorMicrosoft Affected 10.0.0 to before 10.0.11 Fixed in 10.0.11 Patch available CNA
  • .NET 8.0 runtime VendorMicrosoft Affected 8.0.0 to before 8.0.30 Fixed in 8.0.30 Patch available CNA
  • .NET 9.0 runtime VendorMicrosoft Affected 9.0.0 to before 9.0.19 Fixed in 9.0.19 Patch available CNA
  • Microsoft Visual Studio 2022 version 17.14 VendorMicrosoft Affected 17.14.0 to before 17.14.38 Fixed in 17.14.38 Patch available CNA
  • Microsoft Visual Studio 2026 version 18.8 VendorMicrosoft Affected 18.0 to before 18.8.3 Fixed in 18.8.3 Patch available CNA
  • Microsoft.NETCore.App.Runtime.win-arm64 (NuGet) Vendor— Affected 10.0.0 to before 10.0.11 Fixed in 10.0.11 Patch available GHSA-c494-m2fq-59mx
  • Microsoft.NETCore.App.Runtime.win-x64 (NuGet) Vendor— Affected 10.0.0 to before 10.0.11 Fixed in 10.0.11 Patch available GHSA-c494-m2fq-59mx
  • Microsoft.NETCore.App.Runtime.win-x86 (NuGet) Vendor— Affected 10.0.0 to before 10.0.11 Fixed in 10.0.11 Patch available GHSA-c494-m2fq-59mx
  • Microsoft.NETCore.App.Runtime.win-arm64 (NuGet) Vendor— Affected 9.0.0 to before 9.0.19 Fixed in 9.0.19 Patch available GHSA-c494-m2fq-59mx
  • Microsoft.NETCore.App.Runtime.win-x64 (NuGet) Vendor— Affected 9.0.0 to before 9.0.19 Fixed in 9.0.19 Patch available GHSA-c494-m2fq-59mx
  • Microsoft.NETCore.App.Runtime.win-x86 (NuGet) Vendor— Affected 9.0.0 to before 9.0.19 Fixed in 9.0.19 Patch available GHSA-c494-m2fq-59mx
  • Microsoft.NETCore.App.Runtime.win-arm64 (NuGet) Vendor— Affected 8.0.0 to before 8.0.30 Fixed in 8.0.30 Patch available GHSA-c494-m2fq-59mx
  • Microsoft.NETCore.App.Runtime.win-x64 (NuGet) Vendor— Affected 8.0.0 to before 8.0.30 Fixed in 8.0.30 Patch available GHSA-c494-m2fq-59mx
  • Microsoft.NETCore.App.Runtime.win-x86 (NuGet) Vendor— Affected 8.0.0 to before 8.0.30 Fixed in 8.0.30 Patch available GHSA-c494-m2fq-59mx

CPE configurations NVD · 3

CPEVersionsRoleVendor
cpe:2.3:a:microsoft:visual_studio_2022:*:*:*:*:*:*:*:*17.14.0 to before 17.14.38VulnerableMicrosoft
cpe:2.3:a:microsoft:visual_studio_2026:*:*:*:*:*:*:*:*18.8.0 to before 18.8.3VulnerableMicrosoft
cpe:2.3:a:microsoft:.net:*:*:*:*:*:*:*:*8.0.0 to before 8.0.30; 9.0.0 to before 9.0.19; 10.0.0 to before 10.0.11VulnerableMicrosoft
  • cpe:2.3:a:microsoft:visual_studio_2022:*:*:*:*:*:*:*:* Versions 17.14.0 to before 17.14.38 Vulnerable ·Microsoft
  • cpe:2.3:a:microsoft:visual_studio_2026:*:*:*:*:*:*:*:* Versions 18.8.0 to before 18.8.3 Vulnerable ·Microsoft
  • cpe:2.3:a:microsoft:.net:*:*:*:*:*:*:*:* Versions 8.0.0 to before 8.0.30; 9.0.0 to before 9.0.19; 10.0.0 to before 10.0.11 Vulnerable ·Microsoft

Remediation

  • Fix · GHSA-c494-m2fq-59mx Microsoft.NETCore.App.Runtime.win-arm64 (NuGet) Fixed in 10.0.11 Advisory →
  • Fix · GHSA-c494-m2fq-59mx Microsoft.NETCore.App.Runtime.win-x64 (NuGet) Fixed in 10.0.11 Advisory →
  • Fix · GHSA-c494-m2fq-59mx Microsoft.NETCore.App.Runtime.win-x86 (NuGet) Fixed in 10.0.11 Advisory →
  • Fix · GHSA-c494-m2fq-59mx Microsoft.NETCore.App.Runtime.win-arm64 (NuGet) Fixed in 9.0.19 Advisory →
  • Fix · GHSA-c494-m2fq-59mx Microsoft.NETCore.App.Runtime.win-x64 (NuGet) Fixed in 9.0.19 Advisory →
  • Fix · GHSA-c494-m2fq-59mx Microsoft.NETCore.App.Runtime.win-x86 (NuGet) Fixed in 9.0.19 Advisory →
  • Fix · GHSA-c494-m2fq-59mx Microsoft.NETCore.App.Runtime.win-arm64 (NuGet) Fixed in 8.0.30 Advisory →
  • Fix · GHSA-c494-m2fq-59mx Microsoft.NETCore.App.Runtime.win-x64 (NuGet) Fixed in 8.0.30 Advisory →
  • Fix · GHSA-c494-m2fq-59mx Microsoft.NETCore.App.Runtime.win-x86 (NuGet) Fixed in 8.0.30 Advisory →

Microsoft 3 updates

  • KB5122106
    Security Update
    • .NET 10.0 installed on Linux 10.0.11
    • .NET 10.0 installed on Mac OS 10.0.11
    • .NET 10.0 installed on Windows 10.0.11
  • KB5122105
    Security Update
    • .NET 9.0 installed on Linux 9.0.19
    • .NET 9.0 installed on Mac OS 9.0.19
    • .NET 9.0 installed on Windows 9.0.19
  • KB5122104
    Security Update
    • .NET 8.0 installed on Linux 8.0.30
    • .NET 8.0 installed on Mac OS 8.0.30
    • .NET 8.0 installed on Windows 8.0.30

Vendor assessments

Microsoft

Microsoft's page for this CVE →

Impact
Information Disclosure
Exploited
No
Publicly disclosed
No
Exploitability
Exploitation Less Likely
ProductStatusPlan or fix
Microsoft Visual Studio 2022 version 17.14Fixed17.14.38 Security Update
Microsoft Visual Studio 2026 version 18.8Fixed18.8.3 Security Update

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-62898
  2. 2026-10-03 Alias added: GHSA-c494-m2fq-59mx
  3. 2026-10-28 Fix available: Microsoft/.NET 10.0 [email protected], Microsoft/.NET 8.0 [email protected], Microsoft/.NET 9.0 [email protected] · CNA

References

Patch 1

Other 3

  • 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