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Fencer Intel
high 7.5

CVE-2026-109475 json

.NET Denial of Service Vulnerability

published yesterday modified 17h ago also EUVD-2026-121559 , GHSA-3g4v-f5gv-c7xf

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
1.3%
EPSS 1.3% chance of exploitation in 30 days, percentile 70%
public exploits
0
none known

Summary

Stack-based buffer overflow in .NET allows an unauthorized attacker to deny service over a network.

Patch / fix

  • nuget Microsoft.NETCore.App.Runtime.linux-arm 8.0.34, 9.0.23, 10.0.15, 11.0.0
  • nuget Microsoft.NETCore.App.Runtime.linux-arm64 8.0.34, 9.0.23, 10.0.15, 11.0.0
  • nuget Microsoft.NETCore.App.Runtime.linux-musl-arm 8.0.34, 9.0.23, 10.0.15, 11.0.0
  • nuget Microsoft.NETCore.App.Runtime.linux-musl-arm64 8.0.34, 9.0.23, 10.0.15, 11.0.0
  • nuget Microsoft.NETCore.App.Runtime.linux-musl-x64 8.0.34, 9.0.23, 10.0.15, 11.0.0
  • nuget Microsoft.NETCore.App.Runtime.linux-x64 8.0.34, 9.0.23, 10.0.15, 11.0.0
  • nuget Microsoft.NETCore.App.Runtime.osx-arm64 8.0.34, 9.0.23, 10.0.15, 11.0.0
  • nuget Microsoft.NETCore.App.Runtime.osx-x64 8.0.34, 9.0.23, 10.0.15, 11.0.0
  • Microsoft .NET 10.0 installed on Linux 10.0.15
  • Microsoft .NET 10.0 installed on Mac OS 10.0.15
  • Microsoft .NET 11.0 installed on Linux 11.0.0
  • Microsoft .NET 11.0 installed on Mac OS 11.0.0
  • Microsoft .NET 8.0 installed on Linux 8.0.34
  • Microsoft .NET 8.0 installed on Mac OS 8.0.34
  • Microsoft .NET 9.0 installed on Linux 9.0.23
  • Microsoft .NET 9.0 installed on Mac OS 9.0.23

Is CVE-2026-109475 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

Check with Fencer

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-109475 updated cvss 7.5

dotnet8.0: dotnet9.0: dotnet11.0: dotnet10.0: .NET Denial of Service Vulnerability

  • Red Hat Enterprise Linux 8 dotnet, dotnet11.0, dotnet-host, dotnet-sdk-11.0, dotnet-hostfxr-11.0, dotnet-runtime-11.0, +10 more Red Hat Enterprise Linux 9 dotnet11.0, dotnet-host, dotnet-sdk-11.0, dotnet-hostfxr-11.0, dotnet-runtime-11.0, dotnet-sdk-aot-11.0, +9 more Red Hat Enterprise Linux 10 dotnet11.0
    affected: no fix available
  • Red Hat Enterprise Linux AppStream (v. 8) dotnet8.0 8.0.134-1.el8_10, dotnet9.0 9.0.124-1.el8_10, dotnet10.0 10.0.115-1.el8_10, dotnet-sdk-8.0 8.0.134-1.el8_10, dotnet-sdk-9.0 9.0.124-1.el8_10, dotnet-sdk-10.0 10.0.115-1.el8_10, +33 more
    fixed: vendor fix RHSA-2026:99053
  • Red Hat Enterprise Linux AppStream (v. 9) dotnet8.0 8.0.134-1.el9_9, dotnet9.0 9.0.124-1.el9_9, dotnet10.0 10.0.115-1.el9_9, dotnet-sdk-8.0 8.0.134-1.el9_9, dotnet-sdk-9.0 9.0.124-1.el9_9, dotnet-sdk-10.0 10.0.115-1.el9_9, +33 more
    fixed: vendor fix RHSA-2026:99142
  • Red Hat Enterprise Linux AppStream (v. 10) dotnet8.0 8.0.134-1.el10_3, dotnet9.0 9.0.124-1.el10_3, dotnet10.0 10.0.115-1.el10_3, dotnet-sdk-8.0 8.0.134-1.el10_3, dotnet-sdk-9.0 9.0.124-1.el10_3, dotnet-sdk-10.0 10.0.115-1.el10_3, +33 more
    fixed: vendor fix RHSA-2026:99143
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) dotnet-sdk-8.0-source-built-artifacts 8.0.134-1.el9_9, dotnet-sdk-9.0-source-built-artifacts 9.0.124-1.el9_9, dotnet-sdk-10.0-source-built-artifacts 10.0.115-1.el9_9
    fixed: vendor fix RHSA-2026:99142
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) dotnet-sdk-8.0-source-built-artifacts 8.0.134-1.el10_3, dotnet-sdk-9.0-source-built-artifacts 9.0.124-1.el10_3, dotnet-sdk-10.0-source-built-artifacts 10.0.115-1.el10_3
    fixed: vendor fix RHSA-2026:99143
  • Red Hat Enterprise Linux CRB (v. 8) dotnet-sdk-8.0-source-built-artifacts 8.0.134-1.el8_10, dotnet-sdk-9.0-source-built-artifacts 9.0.124-1.el8_10, dotnet-sdk-10.0-source-built-artifacts 10.0.115-1.el8_10
    fixed: vendor fix RHSA-2026:99053
  • Red Hat Hardened Images dotnet10.0 10.0.113-1.hum1, dotnet8.0 8.0.133-0.1.hum1, dotnet9.0 9.0.122-0.1.hum1
    not affected: component not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
yesterday

Exploit prediction

1.28% chance of exploitation in the next 30 days, higher than 70% of all scored CVEs (FIRST EPSS, 2026-11-11).

CVSS scores

assigned by version score vector
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C
GitHub 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected packages

ecosystem package affected fixed in
nuget Microsoft.NETCore.App.Runtime.linux-arm
>=8.0.0-0, <8.0.34
>=9.0.0-0, <9.0.23
>=10.0.0-0, <10.0.15
>=11.0.0-preview.1.26104.118, <11.0.0
8.0.34
9.0.23
10.0.15
11.0.0
nuget Microsoft.NETCore.App.Runtime.linux-arm64
>=8.0.0-0, <8.0.34
>=9.0.0-0, <9.0.23
>=10.0.0-0, <10.0.15
>=11.0.0-preview.1.26104.118, <11.0.0
8.0.34
9.0.23
10.0.15
11.0.0
nuget Microsoft.NETCore.App.Runtime.linux-musl-arm
>=8.0.0-0, <8.0.34
>=9.0.0-0, <9.0.23
>=10.0.0-0, <10.0.15
>=11.0.0-preview.1.26104.118, <11.0.0
8.0.34
9.0.23
10.0.15
11.0.0
nuget Microsoft.NETCore.App.Runtime.linux-musl-arm64
>=8.0.0-0, <8.0.34
>=9.0.0-0, <9.0.23
>=10.0.0-0, <10.0.15
>=11.0.0-preview.1.26104.118, <11.0.0
8.0.34
9.0.23
10.0.15
11.0.0
nuget Microsoft.NETCore.App.Runtime.linux-musl-x64
>=8.0.0-0, <8.0.34
>=9.0.0-0, <9.0.23
>=10.0.0-0, <10.0.15
>=11.0.0-preview.1.26104.118, <11.0.0
8.0.34
9.0.23
10.0.15
11.0.0
nuget Microsoft.NETCore.App.Runtime.linux-x64
>=8.0.0-0, <8.0.34
>=9.0.0-0, <9.0.23
>=10.0.0-0, <10.0.15
>=11.0.0-preview.1.26104.118, <11.0.0
8.0.34
9.0.23
10.0.15
11.0.0
nuget Microsoft.NETCore.App.Runtime.osx-arm64
>=8.0.0-0, <8.0.34
>=9.0.0-0, <9.0.23
>=10.0.0-0, <10.0.15
>=11.0.0-preview.1.26104.118, <11.0.0
8.0.34
9.0.23
10.0.15
11.0.0
nuget Microsoft.NETCore.App.Runtime.osx-x64
>=8.0.0-0, <8.0.34
>=9.0.0-0, <9.0.23
>=10.0.0-0, <10.0.15
>=11.0.0-preview.1.26104.118, <11.0.0
8.0.34
9.0.23
10.0.15
11.0.0

Affected products

  • Microsoft .NET 10.0 installed on Linux
  • Microsoft .NET 10.0 installed on Mac OS
  • Microsoft .NET 11.0 installed on Linux
  • Microsoft .NET 11.0 installed on Mac OS
  • Microsoft .NET 8.0 installed on Linux
  • Microsoft .NET 8.0 installed on Mac OS
  • Microsoft .NET 9.0 installed on Linux
  • Microsoft .NET 9.0 installed on Mac OS

Classification

Weakness
  • CWE-121 Stack-based Buffer Overflow

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.