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TI-2026-42214 Aliases CVE-2026-58649GHSA-44g5-m8vm-448v

.NET Information Disclosure Vulnerability

Priority LOW 29CWE-346Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Required
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, Red Hat and Microsoft. Impact type from Microsoft.

Summary

Origin validation error in .NET allows an unauthorized attacker to disclose information over a network.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00359 29th percentileScored 2026-11-07
Fix Fixed Red Hat: 17 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 10.0.111, 10.0.40010.0.111, 10.0.400Patch availableCNA
Microsoft.NET 11.0 runtime11.0.0 to before 11.0 RC111.0 RC1Patch availableCNA
Microsoft.NET 8.0 runtime8.0.0 to before 8.0.130, 8.0.4248.0.130, 8.0.424Patch availableCNA
Microsoft.NET 9.0 runtime9.0.0 to before 9.0.120, 9.0.3179.0.120, 9.0.317Patch 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
  • .NET 10.0 runtime VendorMicrosoft Affected 10.0.0 to before 10.0.111, 10.0.400 Fixed in 10.0.111, 10.0.400 Patch available CNA
  • .NET 11.0 runtime VendorMicrosoft Affected 11.0.0 to before 11.0 RC1 Fixed in 11.0 RC1 Patch available CNA
  • .NET 8.0 runtime VendorMicrosoft Affected 8.0.0 to before 8.0.130, 8.0.424 Fixed in 8.0.130, 8.0.424 Patch available CNA
  • .NET 9.0 runtime VendorMicrosoft Affected 9.0.0 to before 9.0.120, 9.0.317 Fixed in 9.0.120, 9.0.317 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

CPE configurations NVD · 13

CPEVersionsRoleVendor
cpe:2.3:a:microsoft:.net:11.0.0:preview1:*:*:*:*:*:*11.0.0 preview1VulnerableMicrosoft
cpe:2.3:a:microsoft:.net:11.0.0:preview2:*:*:*:*:*:*11.0.0 preview2VulnerableMicrosoft
cpe:2.3:a:microsoft:.net:11.0.0:preview3:*:*:*:*:*:*11.0.0 preview3VulnerableMicrosoft
cpe:2.3:a:microsoft:.net:11.0.0:preview4:*:*:*:*:*:*11.0.0 preview4VulnerableMicrosoft
cpe:2.3:a:microsoft:.net:11.0.0:preview5:*:*:*:*:*:*11.0.0 preview5VulnerableMicrosoft
cpe:2.3:a:microsoft:.net:11.0.0:preview6:*:*:*:*:*:*11.0.0 preview6VulnerableMicrosoft
cpe:2.3:a:microsoft:.net:11.0.0:preview7:*:*:*:*:*:*11.0.0 preview7VulnerableMicrosoft
cpe:2.3:a:microsoft:.net_sdk:*:*:*:*:*:*:*:*8.0.100 to before 8.0.130; 8.0.200 to before 8.0.424; 9.0.100 to before 9.0.120; 9.0.200 to before 9.0.317; 10.0.100 to before 10.0.111; 10.0.200 to before 10.0.400VulnerableMicrosoft
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:a:microsoft:.net:11.0.0:preview1:*:*:*:*:*:* Versions 11.0.0 preview1 Vulnerable ·Microsoft
  • cpe:2.3:a:microsoft:.net:11.0.0:preview2:*:*:*:*:*:* Versions 11.0.0 preview2 Vulnerable ·Microsoft
  • cpe:2.3:a:microsoft:.net:11.0.0:preview3:*:*:*:*:*:* Versions 11.0.0 preview3 Vulnerable ·Microsoft
  • cpe:2.3:a:microsoft:.net:11.0.0:preview4:*:*:*:*:*:* Versions 11.0.0 preview4 Vulnerable ·Microsoft
  • cpe:2.3:a:microsoft:.net:11.0.0:preview5:*:*:*:*:*:* Versions 11.0.0 preview5 Vulnerable ·Microsoft
  • cpe:2.3:a:microsoft:.net:11.0.0:preview6:*:*:*:*:*:* Versions 11.0.0 preview6 Vulnerable ·Microsoft
  • cpe:2.3:a:microsoft:.net:11.0.0:preview7:*:*:*:*:*:* Versions 11.0.0 preview7 Vulnerable ·Microsoft
  • cpe:2.3:a:microsoft:.net_sdk:*:*:*:*:*:*:*:* Versions 8.0.100 to before 8.0.130; 8.0.200 to before 8.0.424; 9.0.100 to before 9.0.120; 9.0.200 to before 9.0.317; 10.0.100 to before 10.0.111; 10.0.200 to before 10.0.400 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
Show 3 more CPE
CPEVersionsRoleVendor
cpe:2.3:o:microsoft:windows:-:*:*:*:*:*:*:*not specified by NVDRunning onMicrosoft
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:o:microsoft:windows:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·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

Remediation

Red Hat 17 advisories

  • RHSA-2026:89735 Released 2026-10-27 · Red Hat rating Critical
    .NET 9.0 security update
    • Red Hat CodeReady Linux Builder EUS (v.9.6) dotnet-sdk-9.0-source-built-artifacts-9.0.122-1.el9_6
    • Red Hat Enterprise Linux AppStream EUS (v.9.6) aspnetcore-runtime-9.0-9.0.21-1.el9_6, aspnetcore-runtime-dbg-9.0-9.0.21-1.el9_6, aspnetcore-targeting-pack-9.0-9.0.21-1.el9_6 +12
  • RHSA-2026:88474 Released 2026-10-22 · Red Hat rating Critical
    .NET 8.0 security update
    • Red Hat Enterprise Linux AppStream EUS (v. 10.0) aspnetcore-runtime-8.0-8.0.32-1.el10_0, aspnetcore-runtime-dbg-8.0-8.0.32-1.el10_0, aspnetcore-targeting-pack-8.0-8.0.32-1.el10_0 +9
    • Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) dotnet-sdk-8.0-source-built-artifacts-8.0.132-1.el10_0
  • RHSA-2026:88422 Released 2026-10-22 · Red Hat rating Critical
    .NET 8.0 security update
    • Red Hat CodeReady Linux Builder EUS (v.9.6) dotnet-sdk-8.0-source-built-artifacts-8.0.132-1.el9_6
    • Red Hat Enterprise Linux AppStream EUS (v.9.6) aspnetcore-runtime-8.0-8.0.32-1.el9_6, aspnetcore-runtime-dbg-8.0-8.0.32-1.el9_6, aspnetcore-targeting-pack-8.0-8.0.32-1.el9_6 +9
Show 14 more Red Hat advisories
  • RHSA-2026:88425 Released 2026-10-22 · Red Hat rating Critical
    .NET 8.0 security update
    • Red Hat Enterprise Linux AppStream E4S (v.9.4) aspnetcore-runtime-8.0-8.0.32-1.el9_4, aspnetcore-runtime-dbg-8.0-8.0.32-1.el9_4, aspnetcore-targeting-pack-8.0-8.0.32-1.el9_4 +11
  • RHSA-2026:88424 Released 2026-10-22 · Red Hat rating Critical
    .NET 9.0 security update
    • Red Hat Enterprise Linux AppStream EUS (v. 10.0) aspnetcore-runtime-9.0-9.0.21-1.el10_0, aspnetcore-runtime-dbg-9.0-9.0.21-1.el10_0, aspnetcore-targeting-pack-9.0-9.0.21-1.el10_0 +12
    • Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) dotnet-sdk-9.0-source-built-artifacts-9.0.122-1.el10_0
  • RHSA-2026:77004 Released 2026-10-06 · Red Hat rating Moderate
    Red Hat Hardened Images RPMs bug fix and enhancement update
    • Red Hat Hardened Images dotnet-sdk-8.0-8.0.131-0.1.hum1@aarch64, dotnet-sdk-8.0-8.0.131-0.1.hum1@x86_64, dotnet-sdk-8.0-source-built-artifacts-8.0.131-0.1.hum1@aarch64 +6
  • RHSA-2026:76978 Released 2026-10-06 · Red Hat rating Moderate
    Red Hat Hardened Images RPMs bug fix and enhancement update
    • Red Hat Hardened Images dotnet-sdk-9.0-9.0.121-0.1.hum1@aarch64, dotnet-sdk-9.0-9.0.121-0.1.hum1@x86_64, dotnet-sdk-9.0-source-built-artifacts-9.0.121-0.1.hum1@aarch64 +10
  • RHSA-2026:68676 Released 2026-09-17 · Red Hat rating Important
    .NET 10.0 security, bug fix, and enhancement update
    • Red Hat Enterprise Linux AppStream (v. 8) aspnetcore-runtime-10.0-10.0.12-1.el8_10, aspnetcore-runtime-dbg-10.0-10.0.12-1.el8_10, aspnetcore-targeting-pack-10.0-10.0.12-1.el8_10 +12
    • Red Hat Enterprise Linux CRB (v. 8) dotnet-sdk-10.0-source-built-artifacts-10.0.112-1.el8_10
  • RHSA-2026:68316 Released 2026-09-16 · Red Hat rating Moderate
    .NET 8.0 security, bug fix, and enhancement update
    • Red Hat Enterprise Linux AppStream (v. 8) aspnetcore-runtime-8.0-8.0.31-1.el8_10, aspnetcore-runtime-dbg-8.0-8.0.31-1.el8_10, aspnetcore-targeting-pack-8.0-8.0.31-1.el8_10 +9
    • Red Hat Enterprise Linux CRB (v. 8) dotnet-sdk-8.0-source-built-artifacts-8.0.131-1.el8_10
  • RHSA-2026:68233 Released 2026-09-16 · Red Hat rating Important
    .NET 9.0 security, bug fix, and enhancement update
    • Red Hat Enterprise Linux AppStream (v. 8) aspnetcore-runtime-9.0-9.0.20-1.el8_10, aspnetcore-runtime-dbg-9.0-9.0.20-1.el8_10, aspnetcore-targeting-pack-9.0-9.0.20-1.el8_10 +11
    • Red Hat Enterprise Linux CRB (v. 8) dotnet-sdk-9.0-source-built-artifacts-9.0.121-1.el8_10
  • RHSA-2026:67613 Released 2026-09-15 · Red Hat rating Important
    .NET 10.0 security, bug fix, and enhancement update
    • Red Hat Enterprise Linux AppStream (v. 9) aspnetcore-runtime-10.0-10.0.12-1.el9_8, aspnetcore-runtime-dbg-10.0-10.0.12-1.el9_8, aspnetcore-targeting-pack-10.0-10.0.12-1.el9_8 +11
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) dotnet-sdk-10.0-source-built-artifacts-10.0.112-1.el9_8
  • RHSA-2026:67614 Released 2026-09-15 · Red Hat rating Important
    .NET 9.0 security, bug fix, and enhancement update
    • Red Hat Enterprise Linux AppStream (v. 9) aspnetcore-runtime-9.0-9.0.20-1.el9_8, aspnetcore-runtime-dbg-9.0-9.0.20-1.el9_8, aspnetcore-targeting-pack-9.0-9.0.20-1.el9_8 +11
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) dotnet-sdk-9.0-source-built-artifacts-9.0.121-1.el9_8
  • RHSA-2026:67530 Released 2026-09-15 · Red Hat rating Important
    .NET 10.0 security, bug fix, and enhancement update
    • Red Hat Enterprise Linux AppStream (v. 10) aspnetcore-runtime-10.0-10.0.12-1.el10_2, aspnetcore-runtime-dbg-10.0-10.0.12-1.el10_2, aspnetcore-targeting-pack-10.0-10.0.12-1.el10_2 +11
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) dotnet-sdk-10.0-source-built-artifacts-10.0.112-1.el10_2
  • RHSA-2026:67528 Released 2026-09-15 · Red Hat rating Important
    .NET 9.0 security, bug fix, and enhancement update
    • Red Hat Enterprise Linux AppStream (v. 10) aspnetcore-runtime-9.0-9.0.20-1.el10_2, aspnetcore-runtime-dbg-9.0-9.0.20-1.el10_2, aspnetcore-targeting-pack-9.0-9.0.20-1.el10_2 +11
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) dotnet-sdk-9.0-source-built-artifacts-9.0.121-1.el10_2
  • RHSA-2026:67524 Released 2026-09-15 · Red Hat rating Moderate
    .NET 8.0 security, bug fix, and enhancement update
    • Red Hat Enterprise Linux AppStream (v. 9) aspnetcore-runtime-8.0-8.0.31-1.el9_8, aspnetcore-runtime-dbg-8.0-8.0.31-1.el9_8, aspnetcore-targeting-pack-8.0-8.0.31-1.el9_8 +9
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) dotnet-sdk-8.0-source-built-artifacts-8.0.131-1.el9_8
  • RHSA-2026:67525 Released 2026-09-15 · Red Hat rating Moderate
    .NET 8.0 security, bug fix, and enhancement update
    • Red Hat Enterprise Linux AppStream (v. 10) aspnetcore-runtime-8.0-8.0.31-1.el10_2, aspnetcore-runtime-dbg-8.0-8.0.31-1.el10_2, aspnetcore-targeting-pack-8.0-8.0.31-1.el10_2 +9
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) dotnet-sdk-8.0-source-built-artifacts-8.0.131-1.el10_2
  • 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 CodeReady Linux Builder EUS (v.9.6)Fixed RHSA-2026:88422, RHSA-2026:89735
Red Hat Enterprise Linux AppStream (v. 10)Fixed RHSA-2026:67525, RHSA-2026:67528, RHSA-2026:67530
Red Hat Enterprise Linux AppStream (v. 8)Fixed RHSA-2026:68233, RHSA-2026:68316, RHSA-2026:68676
Red Hat Enterprise Linux AppStream (v. 9)Fixed RHSA-2026:67524, RHSA-2026:67613, RHSA-2026:67614
Red Hat Enterprise Linux AppStream E4S (v.9.4)Fixed RHSA-2026:88425
Red Hat Enterprise Linux AppStream EUS (v. 10.0)Fixed RHSA-2026:88424, RHSA-2026:88474
Red Hat Enterprise Linux AppStream EUS (v.9.6)Fixed RHSA-2026:88422, RHSA-2026:89735
Red Hat Enterprise Linux CRB (v. 8)Fixed RHSA-2026:68233, RHSA-2026:68316, RHSA-2026:68676
Red Hat Enterprise Linux CodeReady Linux Builder (v. 10)Fixed RHSA-2026:67525, RHSA-2026:67528, RHSA-2026:67530
Red Hat Enterprise Linux CodeReady Linux Builder (v. 9)Fixed RHSA-2026:67524, RHSA-2026:67613, RHSA-2026:67614
Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0)Fixed RHSA-2026:88424, RHSA-2026:88474
Red Hat Hardened ImagesFixed RHSA-2026:66863, RHSA-2026:76978, RHSA-2026:77004
Not affected: 1 product
  • Red Hat Hardened Images

Microsoft

Microsoft's page for this CVE →

Impact
Information Disclosure
Exploited
No
Publicly disclosed
No
Exploitability
Exploitation Less Likely
ProductStatusPlan or fix
.NET 11.0 installed on LinuxFixed11.0 RC1 Security Update
.NET 11.0 installed on Mac OSFixed11.0 RC1 Security Update
.NET 11.0 installed on WindowsFixed11.0 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-2026-58649
  2. 2026-10-03 Alias added: GHSA-44g5-m8vm-448v
  3. 2026-10-07 Fix available: RHSA-2026:77004 · Red Hat
  4. 2026-10-07 Fix available: RHSA-2026:76978 · Red Hat
  5. 2026-10-07 Affected versions changed · Red Hat
  6. 2026-10-23 Fix available: RHSA-2026:88422 · Red Hat
  7. 2026-10-23 Fix available: RHSA-2026:88424 · Red Hat
  8. 2026-10-23 Fix available: RHSA-2026:88474 · Red Hat
  9. 2026-10-23 Fix available: RHSA-2026:88425 · Red Hat
  10. 2026-10-23 Fix available: Red Hat CodeReady Linux Builder EUS (v.9.6), Red Hat Enterprise Linux AppStream E4S (v.9.4), Red Hat Enterprise Linux AppStream EUS (v. 10.0) +2 · Red Hat
  11. 2026-10-29 Fix available: RHSA-2026:89735 · Red Hat
  12. 2026-10-29 Affected versions changed · Red Hat
  13. 2026-10-30 Fix available: Microsoft/.NET 10.0 [email protected], 10.0.400, Microsoft/.NET 11.0 [email protected] RC1, Microsoft/.NET 8.0 [email protected], 8.0.424 +1 · CNA

References

Patch 1

  • 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