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Fencer Vulns
high 8.8

CVE-2026-102870 json

ASP.NET Core Remote Code Execution Vulnerability

published 2026-10-13 26 d ago modified 2026-11-03 5 d ago also GHSA-g27p-qf6j-c96c , EUVD-2026-100325

cvss
8.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.9%
EPSS 0.9% chance of exploitation in 30 days, percentile 60%
public exploits
0
none known

Summary

Improper control of generation of code ('code injection') in ASP.NET Core allows an unauthorized attacker to execute code over a network.

Patch / fix

  • nuget Microsoft.AspNetCore.Components.WebAssembly.Server 10.0.14, 11.0.0-rc.3.26522.148
  • Microsoft .NET 10.0 installed on Linux 10.0.403
  • Microsoft .NET 10.0 installed on Mac OS 10.0.403
  • Microsoft .NET 10.0 installed on Windows 10.0.403
  • Microsoft .NET 11.0 installed on Linux 11.0.100-rc.3
  • Microsoft .NET 11.0 installed on Mac OS 11.0.100-rc.3
  • Microsoft .NET 11.0 installed on Windows 11.0.100-rc.3
  • Microsoft Microsoft Visual Studio 2019 version 16.11 16.11.61
  • Microsoft Microsoft Visual Studio 2022 version 17.14 17.14.43
  • Microsoft Microsoft Visual Studio 2026 version 18.10 18.10.4
  • Microsoft Microsoft Visual Studio 2026 version 18.11 18.11.2
  • Microsoft Microsoft Visual Studio 2026 version 18.12 18.12 Insiders 3
  • Microsoft Microsoft.AspNetCore.Components.WebAssembly.DevServer 10.0.14
  • Microsoft Microsoft.AspNetCore.Components.WebAssembly.Server 10.0.13
  • dotnet10 Ubuntu 24.04 LTS 10.0.114-10.0.14-0ubuntu1~24.04.1
  • dotnet10 Ubuntu 26.10 10.0.114-10.0.14-0ubuntu1~26.10.1
  • dotnet10 Ubuntu 26.04 LTS 10.0.114-10.0.14-0ubuntu1~26.04.1
  • dotnet11 Ubuntu 26.10 11.0.100-11.0.0~rc3-0ubuntu1~26.10.1

ubuntu advisories UBUNTU-CVE-2026-102870

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • dotnet AlmaLinux 8 10.0.113-1.el8_10
  • dotnet-sdk-10.0 AlmaLinux 8 10.0.113-1.el8_10
  • dotnet-hostfxr-10.0 AlmaLinux 8 10.0.13-1.el8_10
  • dotnet-runtime-10.0 AlmaLinux 8 10.0.13-1.el8_10
  • dotnet-sdk-aot-10.0 AlmaLinux 8 10.0.113-1.el8_10
  • dotnet-sdk-dbg-10.0 AlmaLinux 8 10.0.113-1.el8_10
  • dotnet-templates-10.0 AlmaLinux 8 10.0.113-1.el8_10
  • aspnetcore-runtime-10.0 AlmaLinux 8 10.0.13-1.el8_10

almalinux advisories ALSA-2026:86192ALSA-2026:86193ALSA-2026:86195

  • dotnet10.0 Rocky Linux 10 10.0.113-1.el10_2
  • dotnet10.0 Rocky Linux 9 10.0.113-1.el9_8
  • dotnet10.0 Rocky Linux 8 10.0.113-1.el8_10

rocky linux advisories RLSA-2026:86195RLSA-2026:86193RLSA-2026:86192

  • dotnet10-runtime Alpine 3.24, Alpine 3.23 10.0.13-r0

alpine advisories ALPINE-CVE-2026-102870

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

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-2026-102870 updated cvss 8.8

dotnet10.0: dotnet11.0: ASP.NET Core Remote Code Execution Vulnerability

  • Red Hat Enterprise Linux AppStream (v. 8) dotnet 10.0.113-1.el8_10, dotnet10.0 10.0.113-1.el8_10, dotnet-sdk-10.0 10.0.113-1.el8_10, dotnet-hostfxr-10.0 10.0.13-1.el8_10, dotnet-runtime-10.0 10.0.13-1.el8_10, dotnet-sdk-aot-10.0 10.0.113-1.el8_10, +8 more
    fixed: vendor fix RHSA-2026:86192
  • Red Hat Enterprise Linux AppStream (v. 9) dotnet-host 10.0.13-1.el9_8, dotnet10.0 10.0.113-1.el9_8, dotnet-sdk-10.0 10.0.113-1.el9_8, dotnet-hostfxr-10.0 10.0.13-1.el9_8, dotnet-runtime-10.0 10.0.13-1.el9_8, dotnet-sdk-aot-10.0 10.0.113-1.el9_8, +8 more
    fixed: vendor fix RHSA-2026:86193
  • Red Hat Enterprise Linux AppStream (v. 10) dotnet-host 10.0.13-1.el10_2, dotnet10.0 10.0.113-1.el10_2, dotnet-sdk-10.0 10.0.113-1.el10_2, dotnet-hostfxr-10.0 10.0.13-1.el10_2, dotnet-runtime-10.0 10.0.13-1.el10_2, dotnet-sdk-aot-10.0 10.0.113-1.el10_2, +8 more
    fixed: vendor fix RHSA-2026:86195
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) dotnet-sdk-10.0-source-built-artifacts 10.0.113-1.el9_8
    fixed: vendor fix RHSA-2026:86193
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) dotnet-sdk-10.0-source-built-artifacts 10.0.113-1.el10_2
    fixed: vendor fix RHSA-2026:86195
  • Red Hat Enterprise Linux CRB (v. 8) dotnet-sdk-10.0-source-built-artifacts 10.0.113-1.el8_10
    fixed: vendor fix RHSA-2026:86192
  • Red Hat Hardened Images dotnet10.0 10.0.112-1.hum1, dotnet8.0 8.0.131-0.1.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
no
Technical impact
total
Assessed
32 d ago

Exploit prediction

0.91% chance of exploitation in the next 30 days, higher than 60% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 8.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
CNA 3.1 8.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
GitHub 3.1 8.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Affected packages

ecosystem package affected fixed in
nuget Microsoft.AspNetCore.Components.WebAssembly.Server
>=10.0.0, <10.0.14
>=11.0.0-preview.1, <11.0.0-rc.3.26522.148
10.0.14
11.0.0-rc.3.26522.148

Affected products

  • Microsoft .NET 10.0 installed on Linux
  • Microsoft .NET 10.0 installed on Mac OS
  • Microsoft .NET 10.0 installed on Windows
  • 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 2019 version 16.11
  • Microsoft Microsoft Visual Studio 2022 version 17.14
  • Microsoft Microsoft Visual Studio 2026 version 18.10
  • Microsoft Microsoft Visual Studio 2026 version 18.11
  • Microsoft Microsoft Visual Studio 2026 version 18.12
  • Microsoft Microsoft.AspNetCore.Components.WebAssembly.DevServer
  • Microsoft Microsoft.AspNetCore.Components.WebAssembly.Server

Classification

Weakness
  • CWE-94 Improper Control of Generation of Code

References

Sources

Fencer Vulns 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.