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TI-2025-19581 Aliases CVE-2025-26646GHSA-h4j7-5rxr-p4wc

.NET, Visual Studio, and Build Tools for Visual Studio Spoofing Vulnerability

Priority LOW 39CWE-73Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
Required
Attack complexity
Low
Impact type
Spoofing
Confidentiality · integrity · availability
High · High · High
Fix status
Partial Red Hat: 9 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

External control of file name or path in .NET, Visual Studio, and Build Tools for Visual Studio allows an authorized attacker to perform spoofing over a network.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.01266 69th percentileScored 2026-11-07
Fix Partial Microsoft.Build.Tasks.Core (NuGet): 15.9.30, 16.11.6, 17.8.29 +4Red Hat: 9 advisoriesMicrosoft: 2 updatesRed Hat: 9 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 8.0.168.0.16Patch availableCNA
Microsoft.NET 9.09.0.0 to before 9.0.59.0.5Patch availableCNA
MicrosoftBuild Tools for Visual Studio 202217.0 to before Fixed Version 17.13.7Fixed Version 17.13.7Patch availableCNA
MicrosoftMicrosoft Visual Studio 2022 version 17.1017.10.0 to before 17.10.1517.10.15Patch availableCNA
MicrosoftMicrosoft Visual Studio 2022 version 17.1217.12.0 to before 17.12.817.12.8Patch availableCNA
MicrosoftMicrosoft Visual Studio 2022 version 17.1317.13.0 to before 17.13.717.13.7Patch availableCNA
MicrosoftMicrosoft Visual Studio 2022 version 17.817.8.0 to before 17.8.2117.8.21Patch availableCNA
—Microsoft.Build.Tasks.Core (NuGet)15.8.166 to before 15.9.3015.9.30Patch availableGHSA-h4j7-5rxr-p4wc
—Microsoft.Build.Tasks.Core (NuGet)16.0.461 to before 16.11.616.11.6Patch availableGHSA-h4j7-5rxr-p4wc
—Microsoft.Build.Tasks.Core (NuGet)17.0.0 to before 17.8.2917.8.29Patch availableGHSA-h4j7-5rxr-p4wc
—Microsoft.Build.Tasks.Core (NuGet)17.9.5 to before 17.10.2917.10.29Patch availableGHSA-h4j7-5rxr-p4wc
—Microsoft.Build.Tasks.Core (NuGet)17.11.4 to before 17.12.3617.12.36Patch availableGHSA-h4j7-5rxr-p4wc
—Microsoft.Build.Tasks.Core (NuGet)17.12.6 to before 17.13.2617.13.26Patch availableGHSA-h4j7-5rxr-p4wc
—Microsoft.Build.Tasks.Core (NuGet)17.13.9 to before 17.14.817.14.8Patch availableGHSA-h4j7-5rxr-p4wc
  • .NET 8.0 VendorMicrosoft Affected 8.0.0 to before 8.0.16 Fixed in 8.0.16 Patch available CNA
  • .NET 9.0 VendorMicrosoft Affected 9.0.0 to before 9.0.5 Fixed in 9.0.5 Patch available CNA
  • Build Tools for Visual Studio 2022 VendorMicrosoft Affected 17.0 to before Fixed Version 17.13.7 Fixed in Fixed Version 17.13.7 Patch available CNA
  • Microsoft Visual Studio 2022 version 17.10 VendorMicrosoft Affected 17.10.0 to before 17.10.15 Fixed in 17.10.15 Patch available CNA
  • Microsoft Visual Studio 2022 version 17.12 VendorMicrosoft Affected 17.12.0 to before 17.12.8 Fixed in 17.12.8 Patch available CNA
  • Microsoft Visual Studio 2022 version 17.13 VendorMicrosoft Affected 17.13.0 to before 17.13.7 Fixed in 17.13.7 Patch available CNA
  • Microsoft Visual Studio 2022 version 17.8 VendorMicrosoft Affected 17.8.0 to before 17.8.21 Fixed in 17.8.21 Patch available CNA
  • Microsoft.Build.Tasks.Core (NuGet) Vendor— Affected 15.8.166 to before 15.9.30 Fixed in 15.9.30 Patch available GHSA-h4j7-5rxr-p4wc
  • Microsoft.Build.Tasks.Core (NuGet) Vendor— Affected 16.0.461 to before 16.11.6 Fixed in 16.11.6 Patch available GHSA-h4j7-5rxr-p4wc
  • Microsoft.Build.Tasks.Core (NuGet) Vendor— Affected 17.0.0 to before 17.8.29 Fixed in 17.8.29 Patch available GHSA-h4j7-5rxr-p4wc
  • Microsoft.Build.Tasks.Core (NuGet) Vendor— Affected 17.9.5 to before 17.10.29 Fixed in 17.10.29 Patch available GHSA-h4j7-5rxr-p4wc
  • Microsoft.Build.Tasks.Core (NuGet) Vendor— Affected 17.11.4 to before 17.12.36 Fixed in 17.12.36 Patch available GHSA-h4j7-5rxr-p4wc
  • Microsoft.Build.Tasks.Core (NuGet) Vendor— Affected 17.12.6 to before 17.13.26 Fixed in 17.13.26 Patch available GHSA-h4j7-5rxr-p4wc
  • Microsoft.Build.Tasks.Core (NuGet) Vendor— Affected 17.13.9 to before 17.14.8 Fixed in 17.14.8 Patch available GHSA-h4j7-5rxr-p4wc

CPE configurations NVD · 7

CPEVersionsRoleVendor
cpe:2.3:a:microsoft:build_tools:*:*:*:*:*:visual_studio:*:*before 17.13.7VulnerableMicrosoft
cpe:2.3:a:microsoft:visual_studio_2022:*:*:*:*:*:*:*:*17.8.0 to before 17.8.21; 17.10.0 to before 17.10.15; 17.12.0 to before 17.12.8; 17.13.0 to before 17.13.7VulnerableMicrosoft
cpe:2.3:a:microsoft:.net:*:*:*:*:*:*:*:*9.0.0 to before 9.0.5VulnerableMicrosoft
cpe:2.3:o:apple:macos:-:*:*:*:*:*:*:*not specified by NVDRunning onApple
cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*not specified by NVDRunning onLinux
cpe:2.3:o:microsoft:windows:-:*:*:*:*:*:*:*not specified by NVDRunning onMicrosoft
cpe:2.3:a:microsoft:.net:*:*:*:*:*:*:*:*8.0.0 to before 8.0.16VulnerableMicrosoft
  • cpe:2.3:a:microsoft:build_tools:*:*:*:*:*:visual_studio:*:* Versions before 17.13.7 Vulnerable ·Microsoft
  • cpe:2.3:a:microsoft:visual_studio_2022:*:*:*:*:*:*:*:* Versions 17.8.0 to before 17.8.21; 17.10.0 to before 17.10.15; 17.12.0 to before 17.12.8; 17.13.0 to before 17.13.7 Vulnerable ·Microsoft
  • cpe:2.3:a:microsoft:.net:*:*:*:*:*:*:*:* Versions 9.0.0 to before 9.0.5 Vulnerable ·Microsoft
  • cpe:2.3:o:apple:macos:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Apple
  • cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Linux
  • cpe:2.3:o:microsoft:windows:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Microsoft
  • cpe:2.3:a:microsoft:.net:*:*:*:*:*:*:*:* Versions 8.0.0 to before 8.0.16 Vulnerable ·Microsoft

Remediation

  • Fix · GHSA-h4j7-5rxr-p4wc Microsoft.Build.Tasks.Core (NuGet) Fixed in 15.9.30 Advisory →
  • Fix · GHSA-h4j7-5rxr-p4wc Microsoft.Build.Tasks.Core (NuGet) Fixed in 16.11.6 Advisory →
  • Fix · GHSA-h4j7-5rxr-p4wc Microsoft.Build.Tasks.Core (NuGet) Fixed in 17.8.29 Advisory →
  • Fix · GHSA-h4j7-5rxr-p4wc Microsoft.Build.Tasks.Core (NuGet) Fixed in 17.10.29 Advisory →
  • Fix · GHSA-h4j7-5rxr-p4wc Microsoft.Build.Tasks.Core (NuGet) Fixed in 17.12.36 Advisory →
  • Fix · GHSA-h4j7-5rxr-p4wc Microsoft.Build.Tasks.Core (NuGet) Fixed in 17.13.26 Advisory →
  • Fix · GHSA-h4j7-5rxr-p4wc Microsoft.Build.Tasks.Core (NuGet) Fixed in 17.14.8 Advisory →

Red Hat 9 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-2025:7600 Released 2025-05-14 · Red Hat rating Important
    .NET 9.0 security update
    • Red Hat Enterprise Linux AppStream (v. 9) aspnetcore-runtime-9.0-9.0.5-1.el9_6, aspnetcore-runtime-dbg-9.0-9.0.5-1.el9_6, aspnetcore-targeting-pack-9.0-9.0.5-1.el9_6 +12
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) dotnet-sdk-9.0-source-built-artifacts-9.0.106-1.el9_6
Show 6 more Red Hat advisories
  • RHSA-2025:7603 Released 2025-05-14 · 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-8.0.116-1.el9_4
    • Red Hat Enterprise Linux AppStream EUS (v.9.4) aspnetcore-runtime-8.0-8.0.16-1.el9_4, aspnetcore-runtime-dbg-8.0-8.0.16-1.el9_4, aspnetcore-targeting-pack-8.0-8.0.16-1.el9_4 +11
  • RHSA-2025:7598 Released 2025-05-14 · Red Hat rating Important
    .NET 8.0 security update
    • Red Hat Enterprise Linux AppStream (v. 9) aspnetcore-runtime-8.0-8.0.16-1.el9_6, aspnetcore-runtime-dbg-8.0-8.0.16-1.el9_6, aspnetcore-targeting-pack-8.0-8.0.16-1.el9_6 +9
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) dotnet-sdk-8.0-source-built-artifacts-8.0.116-1.el9_6
  • RHSA-2025:7601 Released 2025-05-14 · Red Hat rating Important
    .NET 9.0 security update
    • Red Hat Enterprise Linux AppStream (v. 10) aspnetcore-runtime-9.0-9.0.5-1.el10_0, aspnetcore-runtime-dbg-9.0-9.0.5-1.el10_0, aspnetcore-targeting-pack-9.0-9.0.5-1.el10_0 +12
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) dotnet-sdk-9.0-source-built-artifacts-9.0.106-1.el10_0
  • RHSA-2025:7599 Released 2025-05-14 · Red Hat rating Important
    .NET 8.0 security update
    • Red Hat Enterprise Linux AppStream (v. 10) aspnetcore-runtime-8.0-8.0.16-1.el10_0, aspnetcore-runtime-dbg-8.0-8.0.16-1.el10_0, aspnetcore-targeting-pack-8.0-8.0.16-1.el10_0 +9
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) dotnet-sdk-8.0-source-built-artifacts-8.0.116-1.el10_0
  • RHSA-2025:7589 Released 2025-05-14 · Red Hat rating Important
    .NET 8.0 security update
    • Red Hat Enterprise Linux AppStream (v. 8) aspnetcore-runtime-8.0-8.0.16-1.el8_10, aspnetcore-runtime-dbg-8.0-8.0.16-1.el8_10, aspnetcore-targeting-pack-8.0-8.0.16-1.el8_10 +9
    • Red Hat Enterprise Linux CRB (v. 8) dotnet-sdk-8.0-source-built-artifacts-8.0.116-1.el8_10
  • RHSA-2025:7571 Released 2025-05-14 · Red Hat rating Important
    .NET 9.0 security update
    • Red Hat Enterprise Linux AppStream (v. 8) aspnetcore-runtime-9.0-9.0.5-1.el8_10, aspnetcore-runtime-dbg-9.0-9.0.5-1.el8_10, aspnetcore-targeting-pack-9.0-9.0.5-1.el8_10 +13
    • Red Hat Enterprise Linux CRB (v. 8) dotnet-sdk-9.0-source-built-artifacts-9.0.106-1.el8_10

Microsoft 2 updates

  • KB5059201
    Security Update
    • .NET 9.0 installed on Linux 9.0.5
    • .NET 9.0 installed on Mac OS 9.0.5
    • .NET 9.0 installed on Windows 9.0.5
  • KB5059200
    Security Update
    • .NET 8.0 installed on Linux 8.0.16
    • .NET 8.0 installed on Mac OS 8.0.16
    • .NET 8.0 installed on Windows 8.0.16

Vendor assessments

Red Hat

Red Hat rating: Important. 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-2025:7603
Red Hat Enterprise Linux AppStream (v. 10)Fixed RHSA-2025:7599, RHSA-2025:7601
Red Hat Enterprise Linux AppStream (v. 8)Fixed RHSA-2025:7571, RHSA-2025:7589
Red Hat Enterprise Linux AppStream (v. 9)Fixed RHSA-2025:7598, RHSA-2025:7600
Red Hat Enterprise Linux AppStream EUS (v.9.4)Fixed RHSA-2025:7603
Red Hat Enterprise Linux CRB (v. 8)Fixed RHSA-2025:7571, RHSA-2025:7589
Red Hat Enterprise Linux CodeReady Linux Builder (v. 10)Fixed RHSA-2025:7599, RHSA-2025:7601
Red Hat Enterprise Linux CodeReady Linux Builder (v. 9)Fixed RHSA-2025:7598, RHSA-2025:7600
Red Hat Hardened ImagesFixed RHSA-2026:9080, RHSA-2026:9205
Not affected: 1 product
  • Red Hat Hardened Images

Microsoft

Microsoft's page for this CVE →

Impact
Spoofing
Exploited
No
Publicly disclosed
No
Exploitability
Exploitation Unlikely
ProductStatusPlan or fix
Build Tools for Visual Studio 2022Fixed Fixed Version 17.13.7 · Security Update
Microsoft Visual Studio 2022 version 17.10Fixed 17.10.15 · Security Update
Microsoft Visual Studio 2022 version 17.12Fixed 17.12.8 · Security Update
Microsoft Visual Studio 2022 version 17.13Fixed 17.13.7 · Security Update
Microsoft Visual Studio 2022 version 17.8Fixed 17.8.21 · Security Update

Timeline

  1. 2026-10-02 Threatist record created from CVE-2025-26646
  2. 2026-10-03 Alias added: GHSA-h4j7-5rxr-p4wc

References

Patch 1

Advisory 1

Other 4

  • 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