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Fencer Vulns
high 7.8

CVE-2026-26131 json

.NET Elevation of Privilege Vulnerability

published 2026-03-10 8 mo ago modified 2026-09-08 2 mo ago also BIT-dotnet-2026-26131 , BIT-dotnet-sdk-2026-26131 , EUVD-2026-10695 , GHSA-crjq-wm6x-6qx7

cvss
7.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 34%
public exploits
0
none known

Summary

Incorrect default permissions in .NET allows an authorized attacker to elevate privileges locally.

Patch / fix

  • nuget Microsoft.NetCore.App.Runtime.linux-arm 10.0.4
  • nuget Microsoft.NetCore.App.Runtime.linux-arm64 10.0.4
  • nuget Microsoft.NetCore.App.Runtime.linux-musl-arm 10.0.4
  • nuget Microsoft.NetCore.App.Runtime.linux-musl-arm64 10.0.4
  • nuget Microsoft.NetCore.App.Runtime.linux-musl-x64 10.0.4
  • nuget Microsoft.NetCore.App.Runtime.linux-x64 10.0.4
  • bitnami dotnet 10.0.4
  • bitnami dotnet-sdk 10.0.4
  • Microsoft .NET 10.0 10.0.4
  • dotnet10.0 hummingbird 1 10.0.106-1.hum1

red hat advisories RHSA-2026:9077

  • dotnet10-runtime Alpine 3.24, Alpine 3.23 10.0.4-r0

alpine advisories ALPINE-CVE-2026-26131

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-2026-26131 updated cvss 7.8

dotnet: .NET: Privilege escalation via incorrect default permissions

  • Red Hat Enterprise Linux 9 dotnet10.0, dotnet-host, dotnet-sdk-10.0, dotnet-hostfxr-10.0, dotnet-runtime-10.0, dotnet-sdk-aot-10.0, +9 more Red Hat Enterprise Linux 10 dotnet10.0
    affected: workaround, no fix available
  • Red Hat Hardened Images dotnet10.0 10.0.106-1.hum1
    fixed: vendor fix RHSA-2026:9077
  • Red Hat Enterprise Linux 8 dotnet, dotnet8.0, dotnet9.0, dotnet10.0, dotnet-host, dotnet-sdk-8.0, +38 more
    not affected: vulnerable code not in execute path
  • Red Hat Enterprise Linux 9 dotnet6.0, dotnet7.0, dotnet8.0, dotnet9.0, dotnet-sdk-6.0, dotnet-sdk-7.0, +42 more Red Hat Enterprise Linux 10 dotnet8.0, dotnet9.0 Red Hat Hardened Images dotnet8.0, dotnet9.0, dotnet-host 10.0.6-1.hum1, dotnet-sdk-10.0 10.0.106-1.hum1, dotnet-hostfxr-10.0 10.0.6-1.hum1, dotnet-runtime-10.0 10.0.6-1.hum1, +10 more
    not affected: vulnerable code 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
8 mo ago

Exploit prediction

0.40% chance of exploitation in the next 30 days, higher than 34% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
GitHub 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CNA 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
OSV 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected packages

ecosystem package affected fixed in
nuget Microsoft.NetCore.App.Runtime.linux-arm
>=10.0.0, <10.0.4
10.0.4
nuget Microsoft.NetCore.App.Runtime.linux-arm64
>=10.0.0, <10.0.4
10.0.4
nuget Microsoft.NetCore.App.Runtime.linux-musl-arm
>=10.0.0, <10.0.4
10.0.4
nuget Microsoft.NetCore.App.Runtime.linux-musl-arm64
>=10.0.0, <10.0.4
10.0.4
nuget Microsoft.NetCore.App.Runtime.linux-musl-x64
>=10.0.0, <10.0.4
10.0.4
nuget Microsoft.NetCore.App.Runtime.linux-x64
>=10.0.0, <10.0.4
10.0.4
bitnami dotnet
>=10.0.0, <10.0.4
10.0.4
bitnami dotnet-sdk
>=10.0.0, <10.0.4
10.0.4

Affected products

  • Microsoft .NET 10.0

Classification

Weakness
  • CWE-276 Incorrect Default Permissions

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.