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Fencer Vulns
high 7.8

CVE-2026-62909 json

.NET Elevation of Privilege Vulnerability

published 2026-08-11 2 mo ago modified 2026-10-30 9 d ago also BIT-dotnet-2026-62909 , BIT-dotnet-sdk-2026-62909 , EUVD-2026-56412 , GHSA-9mr8-pwpw-3j2w

cvss
7.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.3%
EPSS 0.3% chance of exploitation in 30 days, percentile 28%
public exploits
0
none known

Summary

Uncaught exception in .NET allows an authorized attacker to elevate privileges locally.

Patch / fix

  • nuget Microsoft.NETCore.App.Runtime.linux-arm 8.0.30, 9.0.19, 10.0.11
  • nuget Microsoft.NETCore.App.Runtime.linux-arm64 8.0.30, 9.0.19, 10.0.11
  • nuget Microsoft.NETCore.App.Runtime.linux-musl-arm 8.0.30, 9.0.19, 10.0.11
  • nuget Microsoft.NETCore.App.Runtime.linux-musl-arm64 8.0.30, 9.0.19, 10.0.11
  • nuget Microsoft.NETCore.App.Runtime.linux-musl-x64 8.0.30, 9.0.19, 10.0.11
  • nuget Microsoft.NETCore.App.Runtime.linux-x64 8.0.30, 9.0.19, 10.0.11
  • nuget Microsoft.NETCore.App.Runtime.osx-arm64 8.0.30, 9.0.19, 10.0.11
  • nuget Microsoft.NETCore.App.Runtime.osx-x64 8.0.30, 9.0.19, 10.0.11
  • bitnami dotnet 8.0.30, 9.0.19, 10.0.11
  • bitnami dotnet-sdk 8.0.30, 9.0.19, 10.0.11
  • Microsoft .NET 10.0 runtime 10.0.11
  • Microsoft .NET 8.0 runtime 8.0.30
  • Microsoft .NET 9.0 runtime 9.0.19
  • Microsoft Microsoft Visual Studio 2022 version 17.14 17.14.38
  • Microsoft Microsoft Visual Studio 2026 version 18.8 18.8.3
  • dotnet8 Ubuntu 22.04 LTS 8.0.130-8.0.30-0ubuntu1~22.04.1
  • dotnet8 Ubuntu 24.04 LTS 8.0.130-8.0.30-0ubuntu1~24.04.1
  • dotnet10 Ubuntu 24.04 LTS 10.0.111-10.0.11-0ubuntu1~24.04.1
  • dotnet10 Ubuntu 26.04 LTS 10.0.111-10.0.11-0ubuntu1~26.04.1

ubuntu advisories UBUNTU-CVE-2026-62909

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

  • dotnet8.0 hummingbird 1 8.0.130-0.1.hum1
  • dotnet-sdk-8.0 hummingbird 1 8.0.130-0.1.hum1
  • dotnet-hostfxr-8.0 hummingbird 1 8.0.30-0.1.hum1
  • dotnet-runtime-8.0 hummingbird 1 8.0.30-0.1.hum1
  • dotnet-sdk-dbg-8.0 hummingbird 1 8.0.130-0.1.hum1
  • dotnet-templates-8.0 hummingbird 1 8.0.130-0.1.hum1
  • aspnetcore-runtime-8.0 hummingbird 1 8.0.30-0.1.hum1
  • dotnet-runtime-dbg-8.0 hummingbird 1 8.0.30-0.1.hum1

red hat advisories RHSA-2026:58570RHSA-2026:58568RHSA-2026:58569RHSA-2026:58567RHSA-2026:58566RHSA-2026:55405

  • dotnet AlmaLinux 8 11.0.100~rc.3.26522.148-0.12.el8_10
  • dotnet-host AlmaLinux 8 11.0.0~rc.3.26522.148-0.12.el8_10
  • dotnet-sdk-11.0 AlmaLinux 8 11.0.100~rc.3.26522.148-0.12.el8_10
  • dotnet-hostfxr-11.0 AlmaLinux 8 11.0.0~rc.3.26522.148-0.12.el8_10
  • dotnet-runtime-11.0 AlmaLinux 8 11.0.0~rc.3.26522.148-0.12.el8_10
  • dotnet-sdk-aot-11.0 AlmaLinux 8 11.0.100~rc.3.26522.148-0.12.el8_10
  • dotnet-sdk-dbg-11.0 AlmaLinux 8 11.0.100~rc.3.26522.148-0.12.el8_10
  • dotnet-templates-11.0 AlmaLinux 8 11.0.100~rc.3.26522.148-0.12.el8_10

almalinux advisories ALSA-2026:92511ALSA-2026:55856ALSA-2026:55857ALSA-2026:55858ALSA-2026:54538ALSA-2026:54541

  • dotnet11.0 Rocky Linux 8 11.0.100~rc.3.26522.148-0.12.el8_10
  • dotnet9.0 Rocky Linux 9 9.0.120-1.el9_8
  • dotnet10.0 Rocky Linux 9 10.0.111-1.el9_8
  • dotnet10.0 Rocky Linux 10 10.0.111-1.el10_2
  • dotnet8.0 Rocky Linux 9 8.0.130-1.el9_8
  • dotnet10.0 Rocky Linux 8 10.0.111-1.el8_10
  • dotnet9.0 Rocky Linux 8 9.0.120-1.el8_10
  • dotnet8.0 Rocky Linux 10 8.0.130-1.el10_2

rocky linux advisories RLSA-2026:92511RLSA-2026:55856RLSA-2026:55857RLSA-2026:55858RLSA-2026:54574RLSA-2026:54542

  • dotnet8-runtime Alpine 3.24, Alpine 3.23, Alpine 3.22 8.0.31-r0
  • dotnet9-runtime Alpine 3.24, Alpine 3.23, Alpine 3.22 9.0.20-r0
  • dotnet10-runtime Alpine 3.23 10.0.13-r0
  • dotnet10-runtime Alpine 3.24 10.0.12-r0

alpine advisories ALPINE-CVE-2026-62909

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-2026-62909 updated cvss 7.8

.NET: .NET Elevation of Privilege Vulnerability

  • Red Hat Enterprise Linux 8 dotnet/sdk Red Hat Enterprise Linux 9 dotnet/sdk, dotnet11.0 11.0.100~preview.6.26359.118-0.7.el10 Red Hat Enterprise Linux 10 dotnet11.0 11.0.100~preview.6.26359.118-0.7.el10 Red Hat OpenShift Dev Spaces devspaces/udi-rhel9
    affected: workaround, no fix available
  • Red Hat CodeReady Linux Builder EUS (v.9.6) dotnet-sdk-8.0-source-built-artifacts 8.0.130-1.el9_6, dotnet-sdk-9.0-source-built-artifacts 9.0.120-1.el9_6
    fixed: vendor fix RHSA-2026:58569
  • Red Hat Enterprise Linux AppStream (v. 8) dotnet 10.0.111-1.el8_10, dotnet8.0 8.0.130-1.el8_10, dotnet9.0 9.0.120-1.el8_10, dotnet-host 10.0.11-1.el8_10, dotnet10.0 10.0.111-1.el8_10, dotnet-sdk-8.0 8.0.130-1.el8_10, +50 more
    fixed: vendor fix RHSA-2026:54542
  • Red Hat Enterprise Linux AppStream (v. 9) dotnet8.0 8.0.130-1.el9_8, dotnet9.0 9.0.120-1.el9_8, dotnet-host 10.0.11-1.el9_8, dotnet10.0 10.0.111-1.el9_8, dotnet-sdk-8.0 8.0.130-1.el9_8, dotnet-sdk-9.0 9.0.120-1.el9_8, +34 more
    fixed: vendor fix RHSA-2026:55857
  • Red Hat Enterprise Linux AppStream (v. 10) dotnet8.0 8.0.130-1.el10_2, dotnet9.0 9.0.120-1.el10_2, dotnet-host 10.0.11-1.el10_2, dotnet10.0 10.0.111-1.el10_2, dotnet-sdk-8.0 8.0.130-1.el10_2, dotnet-sdk-9.0 9.0.120-1.el10_2, +34 more
    fixed: vendor fix RHSA-2026:55858
  • Red Hat Enterprise Linux AppStream E4S (v.9.4) dotnet8.0 8.0.130-1.el9_4, dotnet-host 8.0.30-1.el9_4, dotnet-sdk-8.0 8.0.130-1.el9_4, dotnet-hostfxr-8.0 8.0.30-1.el9_4, dotnet-runtime-8.0 8.0.30-1.el9_4, dotnet-sdk-dbg-8.0 8.0.130-1.el9_4, +8 more
    fixed: vendor fix RHSA-2026:58568
  • Red Hat Enterprise Linux AppStream EUS (v. 10.0) dotnet8.0 8.0.130-1.el10_0, dotnet9.0 9.0.120-1.el10_0, dotnet-host 9.0.19-1.el10_0, dotnet-sdk-8.0 8.0.130-1.el10_0, dotnet-sdk-9.0 9.0.120-1.el10_0, dotnet-hostfxr-8.0 8.0.30-1.el10_0, +21 more
    fixed: vendor fix RHSA-2026:58566
  • Red Hat Enterprise Linux AppStream EUS (v.9.6) dotnet8.0 8.0.130-1.el9_6, dotnet9.0 9.0.120-1.el9_6, dotnet-host 9.0.19-1.el9_6, dotnet-sdk-8.0 8.0.130-1.el9_6, dotnet-sdk-9.0 9.0.120-1.el9_6, dotnet-hostfxr-8.0 8.0.30-1.el9_6, +21 more
    fixed: vendor fix RHSA-2026:58569
show 6 more
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) dotnet-sdk-8.0-source-built-artifacts 8.0.130-1.el9_8, dotnet-sdk-9.0-source-built-artifacts 9.0.120-1.el9_8, dotnet-sdk-10.0-source-built-artifacts 10.0.111-1.el9_8
    fixed: vendor fix RHSA-2026:55857
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) dotnet-sdk-8.0-source-built-artifacts 8.0.130-1.el10_2, dotnet-sdk-9.0-source-built-artifacts 9.0.120-1.el10_2, dotnet-sdk-10.0-source-built-artifacts 10.0.111-1.el10_2
    fixed: vendor fix RHSA-2026:55858
  • Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) dotnet-sdk-8.0-source-built-artifacts 8.0.130-1.el10_0, dotnet-sdk-9.0-source-built-artifacts 9.0.120-1.el10_0
    fixed: vendor fix RHSA-2026:58566
  • Red Hat Enterprise Linux CRB (v. 8) dotnet-sdk-8.0-source-built-artifacts 8.0.130-1.el8_10, dotnet-sdk-9.0-source-built-artifacts 9.0.120-1.el8_10, dotnet-sdk-10.0-source-built-artifacts 10.0.111-1.el8_10, dotnet-sdk-11.0-source-built-artifacts 11.0.100~rc.3.26522.148-0.12.el8_10
    fixed: vendor fix RHSA-2026:54542
  • Red Hat Hardened Images dotnet9.0 9.0.119-2.hum1, dotnet10.0 10.0.111-1.hum1, dotnet8.0 8.0.130-0.1.hum1, dotnet-sdk-9.0 9.0.119-2.hum1, dotnet-sdk-10.0 10.0.111-1.hum1, dotnet-sdk-8.0 8.0.130-0.1.hum1, +20 more
    fixed: vendor fix RHSA-2026:55405
  • Red Hat Hardened Images dotnet-host 10.0.11-1.hum1, dotnet-hostfxr-9.0 9.0.18-2.hum1, dotnet-runtime-9.0 9.0.18-2.hum1, dotnet-hostfxr-10.0 10.0.11-1.hum1, dotnet-runtime-10.0 10.0.11-1.hum1, aspnetcore-runtime-9.0 9.0.18-2.hum1, +11 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
2 mo ago

Exploit prediction

0.34% chance of exploitation in the next 30 days, higher than 28% 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:H/PR:L/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C
GitHub 3.1 6.7 CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H
CNA 3.1 7.8 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
OSV 3.1 7.8 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H

Affected packages

ecosystem package affected fixed in
nuget Microsoft.NETCore.App.Runtime.linux-arm
>=10.0.0, <10.0.11
>=9.0.0, <9.0.19
>=8.0.0, <8.0.30
10.0.11
9.0.19
8.0.30
nuget Microsoft.NETCore.App.Runtime.linux-arm64
>=10.0.0, <10.0.11
>=9.0.0, <9.0.19
>=8.0.0, <8.0.30
10.0.11
9.0.19
8.0.30
nuget Microsoft.NETCore.App.Runtime.linux-musl-arm
>=10.0.0, <10.0.11
>=9.0.0, <9.0.19
>=8.0.0, <8.0.30
10.0.11
9.0.19
8.0.30
nuget Microsoft.NETCore.App.Runtime.linux-musl-arm64
>=10.0.0, <10.0.11
>=9.0.0, <9.0.19
>=8.0.0, <8.0.30
10.0.11
9.0.19
8.0.30
nuget Microsoft.NETCore.App.Runtime.linux-musl-x64
>=10.0.0, <10.0.11
>=9.0.0, <9.0.19
>=8.0.0, <8.0.30
10.0.11
9.0.19
8.0.30
nuget Microsoft.NETCore.App.Runtime.linux-x64
>=10.0.0, <10.0.11
>=9.0.0, <9.0.19
>=8.0.0, <8.0.30
10.0.11
9.0.19
8.0.30
nuget Microsoft.NETCore.App.Runtime.osx-arm64
>=10.0.0, <10.0.11
>=9.0.0, <9.0.19
>=8.0.0, <8.0.30
10.0.11
9.0.19
8.0.30
nuget Microsoft.NETCore.App.Runtime.osx-x64
>=10.0.0, <10.0.11
>=9.0.0, <9.0.19
>=8.0.0, <8.0.30
10.0.11
9.0.19
8.0.30
bitnami dotnet
>=8.0.0, <8.0.30
>=9.0.0, <9.0.19
>=10.0.0, <10.0.11
8.0.30
9.0.19
10.0.11
bitnami dotnet-sdk
>=8.0.0, <8.0.30
>=9.0.0, <9.0.19
>=10.0.0, <10.0.11
8.0.30
9.0.19
10.0.11

Affected products

  • Microsoft .NET 10.0 runtime
  • Microsoft .NET 8.0 runtime
  • Microsoft .NET 9.0 runtime
  • Microsoft Microsoft Visual Studio 2022 version 17.14
  • Microsoft Microsoft Visual Studio 2026 version 18.8

Classification

Weakness

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.