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TI-2025-34912 Aliases CVE-2025-55247GHSA-w3q9-fxm7-j8fq

.NET Elevation of Privilege Vulnerability

Priority LOW 35CWE-59Published · Updated

Key facts

Attack vector
Local
Privileges required
Low
User interaction
Required
Attack complexity
Low
Impact type
Privilege escalation
Confidentiality · integrity · availability
High · High · High
Fix status
Partial Red Hat: 10 fixed, 1 without a fix

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

Summary

Improper link resolution before file access ('link following') in .NET allows an authorized attacker to elevate privileges locally.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00622 50th percentileScored 2026-11-07
Fix Partial Microsoft.Build.Tasks.Core (NuGet): 18.0.0-preview-25476-107, 17.14.28, 17.12.50 +3Microsoft.Build (NuGet): 18.0.0-preview-25476-107, 17.14.28, 17.12.50 +3+1 more productRed Hat: 10 advisoriesMicrosoft: 2 updatesRed Hat: 10 fixed, 1 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

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 8.08.0.0 to before 8.0.218.0.21Patch availableCNA
Microsoft.NET 9.09.0.0 to before 9.0.109.0.10Patch availableCNA
—Microsoft.Build.Tasks.Core (NuGet)17.15.0-preview-25277-114 to before 18.0.0-preview-25476-10718.0.0-preview-25476-107Patch availableGHSA-w3q9-fxm7-j8fq
—Microsoft.Build.Tasks.Core (NuGet)17.14.0 to before 17.14.2817.14.28Patch availableGHSA-w3q9-fxm7-j8fq
—Microsoft.Build.Tasks.Core (NuGet)17.12.0 to before 17.12.5017.12.50Patch availableGHSA-w3q9-fxm7-j8fq
—Microsoft.Build.Tasks.Core (NuGet)17.11.0 to before 17.11.4817.11.48Patch availableGHSA-w3q9-fxm7-j8fq
—Microsoft.Build.Tasks.Core (NuGet)17.10.0 to before 17.10.4617.10.46Patch availableGHSA-w3q9-fxm7-j8fq
—Microsoft.Build.Tasks.Core (NuGet)17.8.0 to before 17.8.4317.8.43Patch availableGHSA-w3q9-fxm7-j8fq
—Microsoft.Build (NuGet)17.15.0-preview-25277-114 to before 18.0.0-preview-25476-10718.0.0-preview-25476-107Patch availableGHSA-w3q9-fxm7-j8fq
—Microsoft.Build (NuGet)17.14.0 to before 17.14.2817.14.28Patch availableGHSA-w3q9-fxm7-j8fq
—Microsoft.Build (NuGet)17.12.0 to before 17.12.5017.12.50Patch availableGHSA-w3q9-fxm7-j8fq
—Microsoft.Build (NuGet)17.11.0 to before 17.11.4817.11.48Patch availableGHSA-w3q9-fxm7-j8fq
—Microsoft.Build (NuGet)17.10.0 to before 17.10.4617.10.46Patch availableGHSA-w3q9-fxm7-j8fq
—Microsoft.Build (NuGet)17.8.0 to before 17.8.4317.8.43Patch availableGHSA-w3q9-fxm7-j8fq
—Microsoft.Build.Utilities.Core (NuGet)17.15.0-preview-25277-114 to before 18.0.0-preview-25476-10718.0.0-preview-25476-107Patch availableGHSA-w3q9-fxm7-j8fq
—Microsoft.Build.Utilities.Core (NuGet)17.14.0 to before 17.14.2817.14.28Patch availableGHSA-w3q9-fxm7-j8fq
—Microsoft.Build.Utilities.Core (NuGet)17.12.0 to before 17.12.5017.12.50Patch availableGHSA-w3q9-fxm7-j8fq
—Microsoft.Build.Utilities.Core (NuGet)17.11.0 to before 17.11.4817.11.48Patch availableGHSA-w3q9-fxm7-j8fq
—Microsoft.Build.Utilities.Core (NuGet)17.10.0 to before 17.10.4617.10.46Patch availableGHSA-w3q9-fxm7-j8fq
—Microsoft.Build.Utilities.Core (NuGet)17.8.0 to before 17.8.4317.8.43Patch availableGHSA-w3q9-fxm7-j8fq
  • .NET 8.0 VendorMicrosoft Affected 8.0.0 to before 8.0.21 Fixed in 8.0.21 Patch available CNA
  • .NET 9.0 VendorMicrosoft Affected 9.0.0 to before 9.0.10 Fixed in 9.0.10 Patch available CNA
  • Microsoft.Build.Tasks.Core (NuGet) Vendor— Affected 17.15.0-preview-25277-114 to before 18.0.0-preview-25476-107 Fixed in 18.0.0-preview-25476-107 Patch available GHSA-w3q9-fxm7-j8fq
  • Microsoft.Build.Tasks.Core (NuGet) Vendor— Affected 17.14.0 to before 17.14.28 Fixed in 17.14.28 Patch available GHSA-w3q9-fxm7-j8fq
  • Microsoft.Build.Tasks.Core (NuGet) Vendor— Affected 17.12.0 to before 17.12.50 Fixed in 17.12.50 Patch available GHSA-w3q9-fxm7-j8fq
  • Microsoft.Build.Tasks.Core (NuGet) Vendor— Affected 17.11.0 to before 17.11.48 Fixed in 17.11.48 Patch available GHSA-w3q9-fxm7-j8fq
  • Microsoft.Build.Tasks.Core (NuGet) Vendor— Affected 17.10.0 to before 17.10.46 Fixed in 17.10.46 Patch available GHSA-w3q9-fxm7-j8fq
  • Microsoft.Build.Tasks.Core (NuGet) Vendor— Affected 17.8.0 to before 17.8.43 Fixed in 17.8.43 Patch available GHSA-w3q9-fxm7-j8fq
  • Microsoft.Build (NuGet) Vendor— Affected 17.15.0-preview-25277-114 to before 18.0.0-preview-25476-107 Fixed in 18.0.0-preview-25476-107 Patch available GHSA-w3q9-fxm7-j8fq
  • Microsoft.Build (NuGet) Vendor— Affected 17.14.0 to before 17.14.28 Fixed in 17.14.28 Patch available GHSA-w3q9-fxm7-j8fq
  • Microsoft.Build (NuGet) Vendor— Affected 17.12.0 to before 17.12.50 Fixed in 17.12.50 Patch available GHSA-w3q9-fxm7-j8fq
  • Microsoft.Build (NuGet) Vendor— Affected 17.11.0 to before 17.11.48 Fixed in 17.11.48 Patch available GHSA-w3q9-fxm7-j8fq
  • Microsoft.Build (NuGet) Vendor— Affected 17.10.0 to before 17.10.46 Fixed in 17.10.46 Patch available GHSA-w3q9-fxm7-j8fq
  • Microsoft.Build (NuGet) Vendor— Affected 17.8.0 to before 17.8.43 Fixed in 17.8.43 Patch available GHSA-w3q9-fxm7-j8fq
  • Microsoft.Build.Utilities.Core (NuGet) Vendor— Affected 17.15.0-preview-25277-114 to before 18.0.0-preview-25476-107 Fixed in 18.0.0-preview-25476-107 Patch available GHSA-w3q9-fxm7-j8fq
  • Microsoft.Build.Utilities.Core (NuGet) Vendor— Affected 17.14.0 to before 17.14.28 Fixed in 17.14.28 Patch available GHSA-w3q9-fxm7-j8fq
  • Microsoft.Build.Utilities.Core (NuGet) Vendor— Affected 17.12.0 to before 17.12.50 Fixed in 17.12.50 Patch available GHSA-w3q9-fxm7-j8fq
  • Microsoft.Build.Utilities.Core (NuGet) Vendor— Affected 17.11.0 to before 17.11.48 Fixed in 17.11.48 Patch available GHSA-w3q9-fxm7-j8fq
  • Microsoft.Build.Utilities.Core (NuGet) Vendor— Affected 17.10.0 to before 17.10.46 Fixed in 17.10.46 Patch available GHSA-w3q9-fxm7-j8fq
  • Microsoft.Build.Utilities.Core (NuGet) Vendor— Affected 17.8.0 to before 17.8.43 Fixed in 17.8.43 Patch available GHSA-w3q9-fxm7-j8fq

CPE configurations NVD · 2

CPEVersionsRoleVendor
cpe:2.3:a:microsoft:.net:*:*:*:*:*:*:*:*8.0.0 to before 8.0.21; 9.0.0 to before 9.0.10VulnerableMicrosoft
cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*not specified by NVDRunning onLinux
  • cpe:2.3:a:microsoft:.net:*:*:*:*:*:*:*:* Versions 8.0.0 to before 8.0.21; 9.0.0 to before 9.0.10 Vulnerable ·Microsoft
  • cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Linux

Remediation

  • Fix · GHSA-w3q9-fxm7-j8fq Microsoft.Build.Tasks.Core (NuGet) Fixed in 18.0.0-preview-25476-107 Advisory →
  • Fix · GHSA-w3q9-fxm7-j8fq Microsoft.Build.Tasks.Core (NuGet) Fixed in 17.14.28 Advisory →
  • Fix · GHSA-w3q9-fxm7-j8fq Microsoft.Build.Tasks.Core (NuGet) Fixed in 17.12.50 Advisory →
  • Fix · GHSA-w3q9-fxm7-j8fq Microsoft.Build.Tasks.Core (NuGet) Fixed in 17.11.48 Advisory →
  • Fix · GHSA-w3q9-fxm7-j8fq Microsoft.Build.Tasks.Core (NuGet) Fixed in 17.10.46 Advisory →
  • Fix · GHSA-w3q9-fxm7-j8fq Microsoft.Build.Tasks.Core (NuGet) Fixed in 17.8.43 Advisory →
  • Fix · GHSA-w3q9-fxm7-j8fq Microsoft.Build (NuGet) Fixed in 18.0.0-preview-25476-107 Advisory →
  • Fix · GHSA-w3q9-fxm7-j8fq Microsoft.Build (NuGet) Fixed in 17.14.28 Advisory →
  • Fix · GHSA-w3q9-fxm7-j8fq Microsoft.Build (NuGet) Fixed in 17.12.50 Advisory →
  • Fix · GHSA-w3q9-fxm7-j8fq Microsoft.Build (NuGet) Fixed in 17.11.48 Advisory →
  • Fix · GHSA-w3q9-fxm7-j8fq Microsoft.Build (NuGet) Fixed in 17.10.46 Advisory →
  • Fix · GHSA-w3q9-fxm7-j8fq Microsoft.Build (NuGet) Fixed in 17.8.43 Advisory →
  • Fix · GHSA-w3q9-fxm7-j8fq Microsoft.Build.Utilities.Core (NuGet) Fixed in 18.0.0-preview-25476-107 Advisory →
  • Fix · GHSA-w3q9-fxm7-j8fq Microsoft.Build.Utilities.Core (NuGet) Fixed in 17.14.28 Advisory →
  • Fix · GHSA-w3q9-fxm7-j8fq Microsoft.Build.Utilities.Core (NuGet) Fixed in 17.12.50 Advisory →
  • Fix · GHSA-w3q9-fxm7-j8fq Microsoft.Build.Utilities.Core (NuGet) Fixed in 17.11.48 Advisory →
  • Fix · GHSA-w3q9-fxm7-j8fq Microsoft.Build.Utilities.Core (NuGet) Fixed in 17.10.46 Advisory →
  • Fix · GHSA-w3q9-fxm7-j8fq Microsoft.Build.Utilities.Core (NuGet) Fixed in 17.8.43 Advisory →

Red Hat 10 advisories

  • RHSA-2026:9205 Released 2026-04-21 · Red Hat rating Important
    Red Hat Hardened Images RPMs bug fix and enhancement update
    • Red Hat Hardened Images dotnet9.0-9.0.116-1.hum1@src
  • RHSA-2026:9080 Released 2026-04-20 · Red Hat rating Important
    Red Hat Hardened Images RPMs bug fix and enhancement update
    • Red Hat Hardened Images dotnet8.0-8.0.126-1.hum1@src
  • RHSA-2025:23225 Released 2025-12-15 · Red Hat rating Critical
    Red Hat OpenShift Dev Spaces 3.25.0 Release.
    • Red Hat OpenShift Dev Spaces (RHOSDS) 3.25 registry.redhat.io/devspaces/code-rhel9, registry.redhat.io/devspaces/openvsx-rhel9, registry.redhat.io/devspaces/pluginregistry-rhel9 +3
Show 7 more Red Hat advisories
  • RHSA-2025:18256 Released 2025-10-16 · Red Hat rating Important
    .NET 8.0 security update
    • Red Hat CodeReady Linux Builder EUS (v.9.4) dotnet-sdk-8.0-source-built-artifacts-8.0.121-1.el9_4
    • Red Hat Enterprise Linux AppStream EUS (v.9.4) aspnetcore-runtime-8.0-8.0.21-1.el9_4, aspnetcore-runtime-dbg-8.0-8.0.21-1.el9_4, aspnetcore-targeting-pack-8.0-8.0.21-1.el9_4 +11
  • RHSA-2025:18151 Released 2025-10-15 · Red Hat rating Important
    .NET 9.0 security update
    • Red Hat Enterprise Linux AppStream (v. 9) aspnetcore-runtime-9.0-9.0.10-1.el9_6, aspnetcore-runtime-dbg-9.0-9.0.10-1.el9_6, aspnetcore-targeting-pack-9.0-9.0.10-1.el9_6 +12
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) dotnet-sdk-9.0-source-built-artifacts-9.0.111-1.el9_6
  • RHSA-2025:18150 Released 2025-10-15 · Red Hat rating Important
    .NET 9.0 security update
    • Red Hat Enterprise Linux AppStream (v. 8) aspnetcore-runtime-9.0-9.0.10-1.el8_10, aspnetcore-runtime-dbg-9.0-9.0.10-1.el8_10, aspnetcore-targeting-pack-9.0-9.0.10-1.el8_10 +13
    • Red Hat Enterprise Linux CRB (v. 8) dotnet-sdk-9.0-source-built-artifacts-9.0.111-1.el8_10
  • RHSA-2025:18153 Released 2025-10-15 · Red Hat rating Important
    .NET 9.0 security update
    • Red Hat Enterprise Linux AppStream (v. 10) aspnetcore-runtime-9.0-9.0.10-1.el10_0, aspnetcore-runtime-dbg-9.0-9.0.10-1.el10_0, aspnetcore-targeting-pack-9.0-9.0.10-1.el10_0 +12
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) dotnet-sdk-9.0-source-built-artifacts-9.0.111-1.el10_0
  • RHSA-2025:18152 Released 2025-10-15 · Red Hat rating Important
    .NET 8.0 security update
    • Red Hat Enterprise Linux AppStream (v. 10) aspnetcore-runtime-8.0-8.0.21-1.el10_0, aspnetcore-runtime-dbg-8.0-8.0.21-1.el10_0, aspnetcore-targeting-pack-8.0-8.0.21-1.el10_0 +9
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) dotnet-sdk-8.0-source-built-artifacts-8.0.121-1.el10_0
  • RHSA-2025:18149 Released 2025-10-15 · Red Hat rating Important
    .NET 8.0 security update
    • Red Hat Enterprise Linux AppStream (v. 9) aspnetcore-runtime-8.0-8.0.21-1.el9_6, aspnetcore-runtime-dbg-8.0-8.0.21-1.el9_6, aspnetcore-targeting-pack-8.0-8.0.21-1.el9_6 +9
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) dotnet-sdk-8.0-source-built-artifacts-8.0.121-1.el9_6
  • RHSA-2025:18148 Released 2025-10-15 · Red Hat rating Important
    .NET 8.0 security update
    • Red Hat Enterprise Linux AppStream (v. 8) aspnetcore-runtime-8.0-8.0.21-1.el8_10, aspnetcore-runtime-dbg-8.0-8.0.21-1.el8_10, aspnetcore-targeting-pack-8.0-8.0.21-1.el8_10 +9
    • Red Hat Enterprise Linux CRB (v. 8) dotnet-sdk-8.0-source-built-artifacts-8.0.121-1.el8_10

Microsoft 2 updates

  • KB5068332
    Security Update
    • .NET 9.0 installed on Linux 9.0.10
    • .NET 9.0 installed on Mac OS 9.0.10
    • .NET 9.0 installed on Windows 9.0.10
    • ASP.NET Core 9.0 9.0.10
  • KB5068331
    Security Update
    • .NET 8.0 installed on Linux 8.0.21
    • .NET 8.0 installed on Mac OS 8.0.21
    • .NET 8.0 installed on Windows 8.0.21
    • ASP.NET Core 8.0 8.0.21

Vendor assessments

Red Hat

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

ProductStatusPlan or fix
Red Hat Enterprise Linux 9AffectedNo fix planned: Out of support scope
Red Hat CodeReady Linux Builder EUS (v.9.4)Fixed RHSA-2025:18256
Red Hat Enterprise Linux AppStream (v. 10)Fixed RHSA-2025:18152, RHSA-2025:18153
Red Hat Enterprise Linux AppStream (v. 8)Fixed RHSA-2025:18148, RHSA-2025:18150
Red Hat Enterprise Linux AppStream (v. 9)Fixed RHSA-2025:18149, RHSA-2025:18151
Red Hat Enterprise Linux AppStream EUS (v.9.4)Fixed RHSA-2025:18256
Red Hat Enterprise Linux CRB (v. 8)Fixed RHSA-2025:18148, RHSA-2025:18150
Red Hat Enterprise Linux CodeReady Linux Builder (v. 10)Fixed RHSA-2025:18152, RHSA-2025:18153
Red Hat Enterprise Linux CodeReady Linux Builder (v. 9)Fixed RHSA-2025:18149, RHSA-2025:18151
Red Hat Hardened ImagesFixed RHSA-2026:9080, RHSA-2026:9205
Red Hat OpenShift Dev Spaces (RHOSDS) 3.25Fixed RHSA-2025:23225
Not affected: 2 products
  • Red Hat Hardened Images
  • Red Hat OpenShift Dev Spaces (RHOSDS) 3.25

Microsoft

Microsoft's page for this CVE →

Impact
Elevation of Privilege
Exploited
No
Publicly disclosed
No
Exploitability
Exploitation Less Likely

Timeline

  1. 2026-10-02 Threatist record created from CVE-2025-55247
  2. 2026-10-03 Alias added: GHSA-w3q9-fxm7-j8fq
  3. 2026-11-06 EPSS moved to the 50th–90th percentile

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