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Fencer Vulns
high 8.0

CVE-2025-26646 json

.NET, Visual Studio, and Build Tools for Visual Studio Spoofing Vulnerability

published 2025-05-13 17 mo ago modified 2026-09-10 1 mo ago also BIT-dotnet-2025-26646 , BIT-dotnet-sdk-2025-26646 , EUVD-2025-14511 , GHSA-h4j7-5rxr-p4wc

cvss
8.0
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
1.3%
EPSS 1.3% chance of exploitation in 30 days, percentile 69%
public exploits
0
none known

Summary

External control of file name or path in .NET, Visual Studio, and Build Tools for Visual Studio allows an authorized attacker to perform spoofing over a network.

Patch / fix

  • nuget Microsoft.Build.Tasks.Core 15.9.30, 16.11.6, 17.8.29, 17.10.29, 17.12.36, 17.13.26, 17.14.8
  • bitnami dotnet 8.0.16, 9.0.5
  • bitnami dotnet-sdk 8.0.101, 9.0.100
  • Microsoft .NET 8.0 8.0.16
  • Microsoft .NET 9.0 9.0.5
  • Microsoft Build Tools for Visual Studio 2022 Fixed Version 17.13.7
  • Microsoft Microsoft Visual Studio 2022 version 17.10 17.10.15
  • Microsoft Microsoft Visual Studio 2022 version 17.12 17.12.8
  • Microsoft Microsoft Visual Studio 2022 version 17.13 17.13.7
  • Microsoft Microsoft Visual Studio 2022 version 17.8 17.8.21
  • dotnet8 Ubuntu 22.04 LTS 8.0.116-8.0.16-0ubuntu1~22.04.1
  • dotnet8 Ubuntu 24.04 LTS 8.0.116-8.0.16-0ubuntu1~24.04.1
  • dotnet8 Ubuntu 25.10 8.0.116-8.0.16-0ubuntu1
  • dotnet9 Ubuntu 25.10 9.0.106-9.0.5-0ubuntu1

ubuntu advisories UBUNTU-CVE-2025-26646

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

  • dotnet9.0 hummingbird 1 9.0.116-1.hum1
  • dotnet8.0 hummingbird 1 8.0.126-1.hum1
  • dotnet9.0 RHEL 10.0 9.0.106-1.el10_0
  • dotnet-host RHEL 10.0 9.0.5-1.el10_0
  • dotnet-sdk-9.0 RHEL 10.0 9.0.106-1.el10_0
  • dotnet-hostfxr-9.0 RHEL 10.0 9.0.5-1.el10_0
  • dotnet-runtime-9.0 RHEL 10.0 9.0.5-1.el10_0
  • dotnet-sdk-aot-9.0 RHEL 10.0 9.0.106-1.el10_0

red hat advisories RHSA-2026:9205RHSA-2026:9080RHSA-2025:7601RHSA-2025:7603RHSA-2025:7600RHSA-2025:7598

  • dotnet AlmaLinux 8 9.0.106-1.el8_10
  • dotnet-host AlmaLinux 8 9.0.5-1.el8_10
  • dotnet-sdk-9.0 AlmaLinux 8 9.0.106-1.el8_10
  • dotnet-hostfxr-9.0 AlmaLinux 8 9.0.5-1.el8_10
  • dotnet-runtime-9.0 AlmaLinux 8 9.0.5-1.el8_10
  • dotnet-sdk-aot-9.0 AlmaLinux 8 9.0.106-1.el8_10
  • dotnet-sdk-dbg-9.0 AlmaLinux 8 9.0.106-1.el8_10
  • dotnet-templates-9.0 AlmaLinux 8 9.0.106-1.el8_10

almalinux advisories ALSA-2025:7571ALSA-2025:7589ALSA-2025:7598ALSA-2025:7599ALSA-2025:7600ALSA-2025:7601

  • dotnet8.0 Rocky Linux 9 8.0.116-1.el9_6
  • dotnet8.0 Rocky Linux 10 8.0.116-1.el10_0
  • dotnet9.0 Rocky Linux 10 9.0.106-1.el10_0
  • dotnet9.0 Rocky Linux 8 9.0.106-1.el8_10
  • dotnet8.0 Rocky Linux 8 8.0.116-1.el8_10

rocky linux advisories RLSA-2025:7598RLSA-2025:7599RLSA-2025:7601RLSA-2025:7571RLSA-2025:7589

  • dotnet8-runtime Alpine 3.24, Alpine 3.23, Alpine 3.22 +2 more 8.0.16-r0
  • dotnet9-runtime Alpine 3.24, Alpine 3.23, Alpine 3.22 +1 more 9.0.5-r0

alpine advisories ALPINE-CVE-2025-26646

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-2025-26646 updated cvss 8.0

dotnet: .NET and Visual Studio Spoofing Vulnerability

  • Red Hat Enterprise Linux 9 dotnet6.0, dotnet7.0, dotnet-host, dotnet-sdk-6.0, dotnet-sdk-7.0, dotnet-hostfxr-6.0, +16 more
    affected: workaround, no fix planned “No mitigation is currently available that meets Red Hat Product Security’s standards for usability, deployment, applicability, or stability.”
  • Red Hat CodeReady Linux Builder EUS (v.9.4) dotnet-sdk-8.0-source-built-artifacts 8.0.116-1.el9_4
    fixed: vendor fix “No mitigation is currently available that meets Red Hat Product Security’s standards for usability, deployment, applicability, or stability.” RHSA-2025:7603
  • Red Hat Enterprise Linux AppStream (v. 8) dotnet 9.0.106-1.el8_10, dotnet-host 9.0.5-1.el8_10, dotnet8.0 8.0.116-1.el8_10, dotnet9.0 9.0.106-1.el8_10, dotnet-sdk-8.0 8.0.116-1.el8_10, dotnet-sdk-9.0 9.0.106-1.el8_10, +22 more
    fixed: vendor fix “No mitigation is currently available that meets Red Hat Product Security’s standards for usability, deployment, applicability, or stability.” RHSA-2025:7589
  • Red Hat Enterprise Linux AppStream (v. 9) dotnet-host 9.0.5-1.el9_6, dotnet8.0 8.0.116-1.el9_6, dotnet9.0 9.0.106-1.el9_6, dotnet-sdk-8.0 8.0.116-1.el9_6, dotnet-sdk-9.0 9.0.106-1.el9_6, dotnet-hostfxr-9.0 9.0.5-1.el9_6, +21 more
    fixed: vendor fix “No mitigation is currently available that meets Red Hat Product Security’s standards for usability, deployment, applicability, or stability.” RHSA-2025:7598
  • Red Hat Enterprise Linux AppStream (v. 10) dotnet-host 9.0.5-1.el10_0, dotnet8.0 8.0.116-1.el10_0, dotnet9.0 9.0.106-1.el10_0, dotnet-sdk-8.0 8.0.116-1.el10_0, dotnet-sdk-9.0 9.0.106-1.el10_0, dotnet-hostfxr-9.0 9.0.5-1.el10_0, +21 more
    fixed: vendor fix “No mitigation is currently available that meets Red Hat Product Security’s standards for usability, deployment, applicability, or stability.” RHSA-2025:7599
  • Red Hat Enterprise Linux AppStream EUS (v.9.4) dotnet8.0 8.0.116-1.el9_4, dotnet-host 8.0.16-1.el9_4, dotnet-sdk-8.0 8.0.116-1.el9_4, dotnet-hostfxr-8.0 8.0.16-1.el9_4, dotnet-runtime-8.0 8.0.16-1.el9_4, dotnet-sdk-dbg-8.0 8.0.116-1.el9_4, +8 more
    fixed: vendor fix “No mitigation is currently available that meets Red Hat Product Security’s standards for usability, deployment, applicability, or stability.” RHSA-2025:7603
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) dotnet-sdk-8.0-source-built-artifacts 8.0.116-1.el9_6, dotnet-sdk-9.0-source-built-artifacts 9.0.106-1.el9_6
    fixed: vendor fix “No mitigation is currently available that meets Red Hat Product Security’s standards for usability, deployment, applicability, or stability.” RHSA-2025:7598
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) dotnet-sdk-8.0-source-built-artifacts 8.0.116-1.el10_0, dotnet-sdk-9.0-source-built-artifacts 9.0.106-1.el10_0
    fixed: vendor fix “No mitigation is currently available that meets Red Hat Product Security’s standards for usability, deployment, applicability, or stability.” RHSA-2025:7599
show 3 more
  • Red Hat Enterprise Linux CRB (v. 8) dotnet-sdk-8.0-source-built-artifacts 8.0.116-1.el8_10, dotnet-sdk-9.0-source-built-artifacts 9.0.106-1.el8_10
    fixed: vendor fix “No mitigation is currently available that meets Red Hat Product Security’s standards for usability, deployment, applicability, or stability.” RHSA-2025:7589
  • Red Hat Hardened Images dotnet8.0 8.0.126-1.hum1, dotnet9.0 9.0.116-1.hum1
    fixed: vendor fix “No mitigation is currently available that meets Red Hat Product Security’s standards for usability, deployment, applicability, or stability.” RHSA-2026:9080
  • Red Hat Hardened Images dotnet10.0, dotnet-sdk-8.0 8.0.126-1.hum1, dotnet-sdk-9.0 9.0.116-1.hum1, dotnet-hostfxr-8.0 8.0.26-1.hum1, dotnet-hostfxr-9.0 9.0.15-1.hum1, dotnet-runtime-8.0 8.0.26-1.hum1, +21 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
17 mo ago

Exploit prediction

1.27% chance of exploitation in the next 30 days, higher than 69% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 8.0 CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
GitHub 3.1 8.0 CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H
CNA 3.1 8.0 CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H
OSV 3.1 8.0 CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H

Affected packages

ecosystem package affected fixed in
nuget Microsoft.Build.Tasks.Core
>=15.8.166, <15.9.30
>=16.0.461, <16.11.6
>=17.0.0, <17.8.29
>=17.9.5, <17.10.29
>=17.11.4, <17.12.36
>=17.12.6, <17.13.26
>=17.13.9, <17.14.8
15.9.30
16.11.6
17.8.29
17.10.29
17.12.36
17.13.26
17.14.8
bitnami dotnet
>=8.0.0, <8.0.16
>=9.0.0, <9.0.5
8.0.16
9.0.5
bitnami dotnet-sdk
>=8.0.0, <8.0.101
>=9.0.0, <9.0.100
8.0.101
9.0.100

Affected products

  • Microsoft .NET 8.0
  • Microsoft .NET 9.0
  • Microsoft Build Tools for Visual Studio 2022
  • Microsoft Microsoft Visual Studio 2022 version 17.10
  • Microsoft Microsoft Visual Studio 2022 version 17.12
  • Microsoft Microsoft Visual Studio 2022 version 17.13
  • Microsoft Microsoft Visual Studio 2022 version 17.8

Classification

Weakness
  • CWE-73 External Control of File Name or Path

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.