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Fencer Vulns
high 7.5

CVE-2026-32178 json

.NET Spoofing Vulnerability

published 2026-04-14 6 mo ago modified 2026-10-26 13 d ago also BIT-dotnet-2026-32178 , BIT-dotnet-sdk-2026-32178 , EUVD-2026-22562 , GHSA-vmwf-m9c5-3jvc

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
2.3%
EPSS 2.3% chance of exploitation in 30 days, percentile 83%
public exploits
0
none known

Summary

Improper neutralization of special elements in .NET allows an unauthorized attacker to perform spoofing over a network.

Patch / fix

  • nuget Microsoft.NetCore.App.Runtime.linux-arm 8.0.26, 9.0.15, 10.0.6
  • nuget Microsoft.NetCore.App.Runtime.linux-musl-arm 8.0.26, 9.0.15, 10.0.6
  • nuget Microsoft.NetCore.App.Runtime.linux-arm64 8.0.26, 9.0.15, 10.0.6
  • nuget Microsoft.NetCore.App.Runtime.linux-musl-x64 8.0.26, 9.0.15, 10.0.6
  • nuget Microsoft.NetCore.App.Runtime.linux-musl-arm64 8.0.26, 9.0.15, 10.0.6
  • nuget Microsoft.NetCore.App.Runtime.linux-x64 8.0.26, 9.0.15, 10.0.6
  • nuget Microsoft.NetCore.App.Runtime.osx-arm64 8.0.26, 9.0.15, 10.0.6
  • nuget Microsoft.NetCore.App.Runtime.osx-x64 8.0.26, 9.0.15, 10.0.6
  • nuget Microsoft.NetCore.App.Runtime.win-arm 8.0.26, 9.0.15, 10.0.6
  • nuget Microsoft.NetCore.App.Runtime.win-arm64 8.0.26, 9.0.15, 10.0.6
  • nuget Microsoft.NetCore.App.Runtime.win-x64 8.0.26, 9.0.15, 10.0.6
  • nuget Microsoft.NetCore.App.Runtime.win-x86 8.0.26, 9.0.15, 10.0.6
  • bitnami dotnet 8.0.26, 9.0.15, 10.0.6
  • bitnami dotnet-sdk 8.0.26, 9.0.15, 10.0.6
  • Microsoft .NET 10.0 10.0.6
  • Microsoft .NET 8.0 8.0.26
  • Microsoft .NET 9.0 9.0.15
  • Microsoft Microsoft Visual Studio 2022 version 17.12 17.12.19
  • Microsoft Microsoft Visual Studio 2022 version 17.14 17.14.30
  • Red Hat Red Hat Enterprise Linux 10 0:8.0.126-1.el10_1, 0:9.0.116-1.el10_1, 0:10.0.106-1.el10_1
  • Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support 0:8.0.126-1.el10_0, 0:9.0.116-1.el10_0
  • Red Hat Red Hat Enterprise Linux 8 0:8.0.126-1.el8_10, 0:9.0.116-1.el8_10, 0:10.0.106-1.el8_10
  • Red Hat Red Hat Enterprise Linux 9 0:8.0.126-1.el9_7, 0:9.0.116-1.el9_7, 0:10.0.106-1.el9_7
  • Red Hat Red Hat Enterprise Linux 9.4 Extended Update Support 0:8.0.126-1.el9_4
  • Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support 0:8.0.126-1.el9_6, 0:9.0.116-1.el9_6
  • Red Hat Red Hat Hardened Images 8.0.126-1.hum1, 9.0.116-1.hum1, 10.0.106-1.hum1
  • dotnet8 Ubuntu 22.04 LTS 8.0.126-8.0.26-0ubuntu1~22.04.1
  • dotnet8 Ubuntu 24.04 LTS 8.0.126-8.0.26-0ubuntu1~24.04.1
  • dotnet8 Ubuntu 25.10 8.0.126-8.0.26-0ubuntu1~25.10.1
  • dotnet9 Ubuntu 25.10 9.0.116-9.0.15-0ubuntu1~25.10.1
  • dotnet10 Ubuntu 24.04 LTS 10.0.106-10.0.6-0ubuntu1~24.04.1
  • dotnet10 Ubuntu 25.10 10.0.106-10.0.6-0ubuntu1~25.10.1
  • dotnet10 Ubuntu 26.10, Ubuntu 26.04 LTS 10.0.107-10.0.7-0ubuntu1~26.04.1

ubuntu advisories UBUNTU-CVE-2026-32178

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

  • dotnet10.0 hummingbird 1 10.0.106-1.hum1
  • dotnet9.0 hummingbird 1 9.0.116-1.hum1
  • dotnet8.0 hummingbird 1 8.0.126-1.hum1
  • dotnet9.0 RHEL 8 9.0.116-1.el8_10
  • dotnet-sdk-9.0 RHEL 8 9.0.116-1.el8_10
  • dotnet-hostfxr-9.0 RHEL 8 9.0.15-1.el8_10
  • dotnet-runtime-9.0 RHEL 8 9.0.15-1.el8_10
  • dotnet-sdk-aot-9.0 RHEL 8 9.0.116-1.el8_10

red hat advisories RHSA-2026:13693RHSA-2026:13282RHSA-2026:13283RHSA-2026:13281RHSA-2026:13280RHSA-2026:9077

  • dotnet-sdk-8.0 AlmaLinux 8 8.0.126-1.el8_10
  • dotnet-hostfxr-8.0 AlmaLinux 8 8.0.26-1.el8_10
  • dotnet-runtime-8.0 AlmaLinux 8 8.0.26-1.el8_10
  • dotnet-sdk-dbg-8.0 AlmaLinux 8 8.0.126-1.el8_10
  • dotnet-templates-8.0 AlmaLinux 8 8.0.126-1.el8_10
  • aspnetcore-runtime-8.0 AlmaLinux 8 8.0.26-1.el8_10
  • dotnet-runtime-dbg-8.0 AlmaLinux 8 8.0.26-1.el8_10
  • dotnet-apphost-pack-8.0 AlmaLinux 8 8.0.26-1.el8_10

almalinux advisories ALSA-2026:8468ALSA-2026:8469ALSA-2026:8470ALSA-2026:8472ALSA-2026:8473ALSA-2026:8475

  • dotnet8.0 Rocky Linux 9 8.0.126-1.el9_7
  • dotnet10.0 Rocky Linux 9 10.0.106-1.el9_7
  • dotnet9.0 Rocky Linux 9 9.0.116-1.el9_7
  • dotnet10.0 Rocky Linux 10 10.0.106-1.el10_1
  • dotnet8.0 Rocky Linux 10 8.0.126-1.el10_1
  • dotnet9.0 Rocky Linux 10 9.0.116-1.el10_1
  • dotnet8.0 Rocky Linux 8 8.0.126-1.el8_10
  • dotnet10.0 Rocky Linux 8 10.0.106-1.el8_10

rocky linux advisories RLSA-2026:8469RLSA-2026:8471RLSA-2026:8474RLSA-2026:8467RLSA-2026:8470RLSA-2026:8472

  • dotnet8-runtime Alpine 3.24, Alpine 3.23, Alpine 3.22 +2 more 8.0.26-r0
  • dotnet9-runtime Alpine 3.24, Alpine 3.23, Alpine 3.22 +1 more 9.0.15-r0
  • dotnet10-runtime Alpine 3.24, Alpine 3.23 10.0.6-r0

alpine advisories ALPINE-CVE-2026-32178

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-2026-32178 updated cvss 7.5

dotnet: Dotnet: SMTP Command Injection and Header Injection via MailAddress parsing flaw

  • Red Hat CodeReady Linux Builder EUS (v.9.4) dotnet-sdk-8.0-source-built-artifacts 8.0.126-1.el9_4
    fixed: vendor fix RHSA-2026:13693
  • Red Hat CodeReady Linux Builder EUS (v.9.6) dotnet-sdk-8.0-source-built-artifacts 8.0.126-1.el9_6, dotnet-sdk-9.0-source-built-artifacts 9.0.116-1.el9_6
    fixed: vendor fix RHSA-2026:13283
  • Red Hat Enterprise Linux AppStream (v. 8) dotnet 10.0.106-1.el8_10, dotnet8.0 8.0.126-1.el8_10, dotnet9.0 9.0.116-1.el8_10, dotnet-host 10.0.6-1.el8_10, dotnet10.0 10.0.106-1.el8_10, dotnet-sdk-8.0 8.0.126-1.el8_10, +35 more
    fixed: vendor fix RHSA-2026:8473
  • Red Hat Enterprise Linux AppStream (v. 9) dotnet8.0 8.0.126-1.el9_7, dotnet9.0 9.0.116-1.el9_7, dotnet-host 10.0.6-1.el9_7, dotnet10.0 10.0.106-1.el9_7, dotnet-sdk-8.0 8.0.126-1.el9_7, dotnet-sdk-9.0 9.0.116-1.el9_7, +34 more
    fixed: vendor fix RHSA-2026:8471
  • Red Hat Enterprise Linux AppStream (v. 10) dotnet8.0 8.0.126-1.el10_1, dotnet9.0 9.0.116-1.el10_1, dotnet-host 10.0.6-1.el10_1, dotnet10.0 10.0.106-1.el10_1, dotnet-sdk-8.0 8.0.126-1.el10_1, dotnet-sdk-9.0 9.0.116-1.el10_1, +34 more
    fixed: vendor fix RHSA-2026:8467
  • Red Hat Enterprise Linux AppStream EUS (v. 10.0) dotnet8.0 8.0.126-1.el10_0, dotnet9.0 9.0.116-1.el10_0, dotnet-host 9.0.15-1.el10_0, dotnet-sdk-8.0 8.0.126-1.el10_0, dotnet-sdk-9.0 9.0.116-1.el10_0, dotnet-hostfxr-8.0 8.0.26-1.el10_0, +21 more
    fixed: vendor fix RHSA-2026:13281
  • Red Hat Enterprise Linux AppStream EUS (v.9.4) dotnet8.0 8.0.126-1.el9_4, dotnet-host 8.0.26-1.el9_4, dotnet-sdk-8.0 8.0.126-1.el9_4, dotnet-hostfxr-8.0 8.0.26-1.el9_4, dotnet-runtime-8.0 8.0.26-1.el9_4, dotnet-sdk-dbg-8.0 8.0.126-1.el9_4, +8 more
    fixed: vendor fix RHSA-2026:13693
  • Red Hat Enterprise Linux AppStream EUS (v.9.6) dotnet8.0 8.0.126-1.el9_6, dotnet9.0 9.0.116-1.el9_6, dotnet-host 9.0.15-1.el9_6, dotnet-sdk-8.0 8.0.126-1.el9_6, dotnet-sdk-9.0 9.0.116-1.el9_6, dotnet-hostfxr-8.0 8.0.26-1.el9_6, +21 more
    fixed: vendor fix RHSA-2026:13283
show 6 more
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) dotnet-sdk-8.0-source-built-artifacts 8.0.126-1.el9_7, dotnet-sdk-9.0-source-built-artifacts 9.0.116-1.el9_7, dotnet-sdk-10.0-source-built-artifacts 10.0.106-1.el9_7
    fixed: vendor fix RHSA-2026:8471
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) dotnet-sdk-8.0-source-built-artifacts 8.0.126-1.el10_1, dotnet-sdk-9.0-source-built-artifacts 9.0.116-1.el10_1, dotnet-sdk-10.0-source-built-artifacts 10.0.106-1.el10_1
    fixed: vendor fix RHSA-2026:8467
  • Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) dotnet-sdk-8.0-source-built-artifacts 8.0.126-1.el10_0, dotnet-sdk-9.0-source-built-artifacts 9.0.116-1.el10_0
    fixed: vendor fix RHSA-2026:13281
  • Red Hat Enterprise Linux CRB (v. 8) dotnet-sdk-8.0-source-built-artifacts 8.0.126-1.el8_10, dotnet-sdk-9.0-source-built-artifacts 9.0.116-1.el8_10, dotnet-sdk-10.0-source-built-artifacts 10.0.106-1.el8_10
    fixed: vendor fix RHSA-2026:8473
  • Red Hat Hardened Images dotnet8.0 8.0.126-1.hum1, dotnet9.0 9.0.116-1.hum1, dotnet10.0 10.0.106-1.hum1
    fixed: vendor fix RHSA-2026:9077
  • Red Hat Hardened Images aspnetcore-runtime-8.0 8.0.26-1.hum1, aspnetcore-runtime-9.0 9.0.15-1.hum1, aspnetcore-runtime-10.0 10.0.6-1.hum1
    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
yes
Technical impact
partial
Assessed
6 mo ago

Exploit prediction

2.28% chance of exploitation in the next 30 days, higher than 83% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C
CISA ADP 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
GitHub 3.1 0.0 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:N
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
OSV 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Affected packages

ecosystem package affected fixed in
nuget Microsoft.NetCore.App.Runtime.linux-arm
>=10.0.0, <10.0.6
>=9.0.0, <9.0.15
>=8.0.0, <8.0.26
10.0.6
9.0.15
8.0.26
nuget Microsoft.NetCore.App.Runtime.linux-musl-arm
>=10.0.0, <10.0.6
>=9.0.0, <9.0.15
>=8.0.0, <8.0.26
10.0.6
9.0.15
8.0.26
nuget Microsoft.NetCore.App.Runtime.linux-arm64
>=10.0.0, <10.0.6
>=9.0.0, <9.0.15
>=8.0.0, <8.0.26
10.0.6
9.0.15
8.0.26
nuget Microsoft.NetCore.App.Runtime.linux-musl-x64
>=10.0.0, <10.0.6
>=9.0.0, <9.0.15
>=8.0.0, <8.0.26
10.0.6
9.0.15
8.0.26
nuget Microsoft.NetCore.App.Runtime.linux-musl-arm64
>=10.0.0, <10.0.6
>=9.0.0, <9.0.15
>=8.0.0, <8.0.26
10.0.6
9.0.15
8.0.26
nuget Microsoft.NetCore.App.Runtime.linux-x64
>=10.0.0, <10.0.6
>=9.0.0, <9.0.15
>=8.0.0, <8.0.26
10.0.6
9.0.15
8.0.26
nuget Microsoft.NetCore.App.Runtime.osx-arm64
>=10.0.0, <10.0.6
>=9.0.0, <9.0.15
>=8.0.0, <8.0.26
10.0.6
9.0.15
8.0.26
nuget Microsoft.NetCore.App.Runtime.osx-x64
>=10.0.0, <10.0.6
>=9.0.0, <9.0.15
>=8.0.0, <8.0.26
10.0.6
9.0.15
8.0.26
nuget Microsoft.NetCore.App.Runtime.win-arm
>=10.0.0, <10.0.6
>=9.0.0, <9.0.15
>=8.0.0, <8.0.26
10.0.6
9.0.15
8.0.26
nuget Microsoft.NetCore.App.Runtime.win-arm64
>=10.0.0, <10.0.6
>=9.0.0, <9.0.15
>=8.0.0, <8.0.26
10.0.6
9.0.15
8.0.26
nuget Microsoft.NetCore.App.Runtime.win-x64
>=10.0.0, <10.0.6
>=9.0.0, <9.0.15
>=8.0.0, <8.0.26
10.0.6
9.0.15
8.0.26
nuget Microsoft.NetCore.App.Runtime.win-x86
>=10.0.0, <10.0.6
>=9.0.0, <9.0.15
>=8.0.0, <8.0.26
10.0.6
9.0.15
8.0.26
bitnami dotnet
>=8.0.0, <8.0.26
>=9.0.0, <9.0.15
>=10.0.0, <10.0.6
8.0.26
9.0.15
10.0.6
bitnami dotnet-sdk
>=8.0.0, <8.0.26
>=9.0.0, <9.0.15
>=10.0.0, <10.0.6
8.0.26
9.0.15
10.0.6

Affected products

  • Microsoft .NET 10.0
  • Microsoft .NET 8.0
  • Microsoft .NET 9.0
  • Microsoft Microsoft Visual Studio 2022 version 17.12
  • Microsoft Microsoft Visual Studio 2022 version 17.14
  • Red Hat Red Hat Enterprise Linux 10
  • Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support
  • Red Hat Red Hat Enterprise Linux 8
  • Red Hat Red Hat Enterprise Linux 9
  • Red Hat Red Hat Enterprise Linux 9.4 Extended Update Support
  • Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support
  • Red Hat Red Hat Hardened Images

Classification

Weakness
  • CWE-138 Improper Neutralization of Special Elements

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.