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CVE-2026-114156 ASP.NET Core Security Feature Bypass Vulnerability

6.5 mediumEPSS 0.6%Fix available

Medium (6.5) in microsoft. EPSS 0.6% estimated probability of exploitation activity in the next 30 days. Fixed in Microsoft.AspNetCore.App.Runtime.linux-arm 11.0.0.

On this page
Improper input validation in ASP.NET Core allows an unauthorized attacker to bypass a security feature over a network.

Severity

CVSS 3.1

6.5 medium
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N
EPSS
0.6% estimated probability of exploitation activity in the next 30 days; 50th percentile. Scored 2026-11-13. A forecast for this CVE across the internet, not for your own systems.
CISA's assessment (SSVC)
Exploitation: none · Automatable: no · Technical impact: partial, assessed 2026-11-10. From CISA's Vulnrichment in the CVE List: whether it is exploited, whether exploiting it can be automated, and how much control it gives.
CWE
CWE-41 Improper Resolution of Path Equivalence
Published
Modified
Assigned by
microsoft (CNA)
NVD analysis
Awaiting analysis
Record from
the NVD, synced

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Affected

  • microsoft:.net 11.0 installed on linux
  • microsoft:.net 11.0 installed on mac os
  • microsoft:.net 11.0 installed on windows
  • microsoft:microsoft visual studio 2026 version 18.12

Versions

From the CNA's record in the CVE List.

ProductAffected
Microsoft .NET 11.0 installed on Linuxfrom 11.0.0-preview.1 before 11.0.0
Microsoft .NET 11.0 installed on Mac OSfrom 11.0.0-preview.1 before 11.0.0
Microsoft .NET 11.0 installed on Windowsfrom 11.0.0-preview.1 before 11.0.0
Microsoft Visual Studio 2026 version 18.12from 18.12.0 before 18.12.0

Fix and patched versions

  • Microsoft.AspNetCore.App.Runtime.linux-arm (NuGet): fixed in 11.0.0
  • Microsoft.AspNetCore.App.Runtime.linux-arm64 (NuGet): fixed in 11.0.0
  • Microsoft.AspNetCore.App.Runtime.linux-musl-arm (NuGet): fixed in 11.0.0
  • Microsoft.AspNetCore.App.Runtime.linux-musl-arm64 (NuGet): fixed in 11.0.0
  • Microsoft.AspNetCore.App.Runtime.linux-musl-x64 (NuGet): fixed in 11.0.0
  • Microsoft.AspNetCore.App.Runtime.linux-x64 (NuGet): fixed in 11.0.0
  • Microsoft.AspNetCore.App.Runtime.osx-arm64 (NuGet): fixed in 11.0.0
  • Microsoft.AspNetCore.App.Runtime.osx-x64 (NuGet): fixed in 11.0.0
  • Ubuntu: fixed package versions per release

Packages (OSV)

AdvisoryEcosystemPackageAffectedFixed in
GHSA-8w29-6cjc-h6w4NuGetMicrosoft.AspNetCore.App.Runtime.linux-arm>=11.0.0-preview.7.26381.103 <11.0.011.0.0
GHSA-8w29-6cjc-h6w4NuGetMicrosoft.AspNetCore.App.Runtime.linux-arm64>=11.0.0-preview.7.26381.103 <11.0.011.0.0
GHSA-8w29-6cjc-h6w4NuGetMicrosoft.AspNetCore.App.Runtime.linux-musl-arm>=11.0.0-preview.7.26381.103 <11.0.011.0.0
GHSA-8w29-6cjc-h6w4NuGetMicrosoft.AspNetCore.App.Runtime.linux-musl-arm64>=11.0.0-preview.7.26381.103 <11.0.011.0.0
GHSA-8w29-6cjc-h6w4NuGetMicrosoft.AspNetCore.App.Runtime.linux-musl-x64>=11.0.0-preview.7.26381.103 <11.0.011.0.0
GHSA-8w29-6cjc-h6w4NuGetMicrosoft.AspNetCore.App.Runtime.linux-x64>=11.0.0-preview.7.26381.103 <11.0.011.0.0
GHSA-8w29-6cjc-h6w4NuGetMicrosoft.AspNetCore.App.Runtime.osx-arm64>=11.0.0-preview.7.26381.103 <11.0.011.0.0
GHSA-8w29-6cjc-h6w4NuGetMicrosoft.AspNetCore.App.Runtime.osx-x64>=11.0.0-preview.7.26381.103 <11.0.011.0.0
GHSA-8w29-6cjc-h6w4NuGetMicrosoft.AspNetCore.App.Runtime.win-arm64>=11.0.0-preview.7.26381.103 <11.0.011.0.0
GHSA-8w29-6cjc-h6w4NuGetMicrosoft.AspNetCore.App.Runtime.win-x64>=11.0.0-preview.7.26381.103 <11.0.011.0.0
GHSA-8w29-6cjc-h6w4NuGetMicrosoft.AspNetCore.App.Runtime.win-x86>=11.0.0-preview.7.26381.103 <11.0.011.0.0

Linux distributions

DistributionReleasePackageFixed inAdvisory
Ubuntu22.04:LTSdotnet7no fix listedUBUNTU-CVE-2026-114156
Ubuntu22.04:LTSdotnet88.0.134-8.0.34-0ubuntu1~22.04.1USN-9042-1
Ubuntu24.04:LTSdotnet1010.0.115-10.0.15-0ubuntu1~24.04.1USN-9042-1
Ubuntu24.04:LTSdotnet88.0.134-8.0.34-0ubuntu1~24.04.1USN-9042-1
Ubuntu26.04:LTSdotnet1010.0.115-10.0.15-0ubuntu1~26.04.1USN-9042-1
Ubuntu26.10dotnet1010.0.115-10.0.15-0ubuntu1~26.10.1USN-9042-1
Ubuntu26.10dotnet1111.0.100-11.0.0-0ubuntu1~26.10.1UBUNTU-CVE-2026-114156 USN-9042-1

From the distributions' data via OSV.dev: Ubuntu Security Notices © Canonical Ltd., CC BY-SA 4.0. Modified: reformatted and linked to CVE records. Credits. On the distributions' own pages: Ubuntu.

Red Hat

Red Hat rates this Important.

ProductPackageStateAdvisory
Red Hat Enterprise Linux 10dotnet11.0Affected
Red Hat Enterprise Linux 8dotnet11.0Affected
Red Hat Enterprise Linux 9dotnet11.0Affected

Contains Red Hat Security Data © Red Hat, Inc., licensed under CC BY 4.0. Source: https://access.redhat.com/security/data. Modified: reformatted. Red Hat's page for CVE-2026-114156.

Attack patterns (CAPEC)

  • CAPEC-3 Using Leading 'Ghost' Character Sequences to Bypass Input Filters Likelihood: Medium · Severity: Medium

The attack patterns MITRE's CAPEC relates to this record's weaknesses, as MITRE names them. Credits.

References

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