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Fencer Vulns
high 7.8

CVE-2026-62871 json

.NET Elevation of Privilege Vulnerability

published 2026-08-11 2 mo ago modified 2026-10-30 9 d ago also BIT-dotnet-2026-62871 , BIT-dotnet-sdk-2026-62871 , EUVD-2026-56679 , GHSA-vg44-h755-9hw7

cvss
7.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.5%
EPSS 0.5% chance of exploitation in 30 days, percentile 40%
public exploits
0
none known

Summary

Out-of-bounds write in .NET allows an unauthorized attacker to execute code locally.

Patch / fix

  • nuget Microsoft.WindowsDesktop.App.Runtime.win-arm64 8.0.30, 9.0.19, 10.0.11
  • nuget Microsoft.WindowsDesktop.App.Runtime.win-x64 8.0.30, 9.0.19, 10.0.11
  • nuget Microsoft.WindowsDesktop.App.Runtime.win-x86 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 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-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-2026-62871

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-2026-62871 updated cvss 7.8

dotnet: .NET: Arbitrary Code Execution via Out-of-Bounds Write

  • Red Hat Enterprise Linux 8 dotnet, dotnet8.0, dotnet9.0, dotnet/sdk, dotnet10.0, dotnet-host, +39 more Red Hat Enterprise Linux 9 dotnet6.0, dotnet7.0, dotnet8.0, dotnet9.0, dotnet/sdk, dotnet10.0, +59 more Red Hat Enterprise Linux 10 dotnet8.0, dotnet9.0, dotnet10.0, dotnet11.0 Red Hat Hardened Images dotnet8.0, dotnet9.0, dotnet10.0 Red Hat OpenShift Dev Spaces devspaces/udi-rhel9
    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

0.47% chance of exploitation in the next 30 days, higher than 40% 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:N/UI:R/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:N/UI:R/S:U/C:H/I:H/A:H
CNA 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
OSV 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Affected packages

ecosystem package affected fixed in
nuget Microsoft.WindowsDesktop.App.Runtime.win-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.WindowsDesktop.App.Runtime.win-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.WindowsDesktop.App.Runtime.win-x86
>=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 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.