CVE-2026-32178: Improper neutralization of special elements in .NET allows an unauthorized attacker to perform spoofing over a

Q: How do I fix CVE-2026-32178?

.net: upgrade to 8.0.26, 9.0.15, 10.0.6; visual studio 2022: upgrade to 17.12.19, 17.14.30. Exact commands for each OS are on this page.

Q: Is CVE-2026-32178 being exploited?

CVE-2026-32178 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-32178 affect?

CVE-2026-32178 affects .net, visual studio 2022. Severity is high (CVSS 7.5). Improper neutralization of special elements in .NET allows an unauthorized attacker to perform spoofing over a network.

Q: How urgent is CVE-2026-32178?

Priority 57/100. High severity; Remotely exploitable, no login, no user action; On your watchlist

This month

HIGH 7.5REMOTEWATCHLISTUPGRADEUPGRADE

CVE-2026-32178 is a high-severity flaw (CVSS 7.5) affecting .net, visual studio 2022. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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

Why this priority

High severity
Remotely exploitable, no login, no user action
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	2.3% (top 17%)
CISA exploited list	No
Weakness	CWE-138
Published	2026-04-14
Last modified	2026-10-26

Publisher (CNA): Microsoft Corporation · Vendor: microsoft

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-14 18:17 UTCPublished CVE record published
2026-10-26 22:10 UTCUpdated Record last modified

microsoft .net UPGRADE

Affected: >= 10.0.0 and < 10.0.6 · >= 8.0.0 and < 8.0.26 · >= 9.0.0 and < 9.0.15

Fixed in: 8.0.26, 9.0.15, 10.0.6

Safe to downgrade to: a release before 8.0.0

1. Check installed version

apt-cache policy .net || rpm -q .net || .net --version

2. UPGRADE to 8.0.26 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade .net

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade .net

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 8.0.0 (Debian / Ubuntu)

apt-cache madison .net sudo apt install .net=<VERSION_BEFORE_8.0.0> sudo apt-mark hold .net

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list .net sudo dnf downgrade .net-<VERSION_BEFORE_8.0.0> sudo dnf versionlock add .net

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

microsoft visual studio 2022 UPGRADE

Affected: >= 17.12.0 and < 17.12.19 · >= 17.14.0 and < 17.14.30

Fixed in: 17.12.19, 17.14.30

Safe to downgrade to: a release before 17.12.0

1. Check installed version

apt-cache policy visual-studio-2022 || rpm -q visual-studio-2022 || visual-studio-2022 --version

2. UPGRADE to 17.12.19 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade visual-studio-2022

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade visual-studio-2022

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 17.12.0 (Debian / Ubuntu)

apt-cache madison visual-studio-2022 sudo apt install visual-studio-2022=<VERSION_BEFORE_17.12.0> sudo apt-mark hold visual-studio-2022

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list visual-studio-2022 sudo dnf downgrade visual-studio-2022-<VERSION_BEFORE_17.12.0> sudo dnf versionlock add visual-studio-2022

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Exact fixes by distribution

NuGet (.NET) · Microsoft.NetCore.App.Runtime.linux-arm · FIXED · 10.0.6 · vulnerable: >= 10.0.0, <= 10.0.5 · source

dotnet add package Microsoft.NetCore.App.Runtime.linux-arm --version 10.0.6

NuGet (.NET) · Microsoft.NetCore.App.Runtime.linux-musl-arm · FIXED · 10.0.6 · vulnerable: >= 10.0.0, <= 10.0.5 · source

dotnet add package Microsoft.NetCore.App.Runtime.linux-musl-arm --version 10.0.6

NuGet (.NET) · Microsoft.NetCore.App.Runtime.linux-arm64 · FIXED · 10.0.6 · vulnerable: >= 10.0.0, <= 10.0.5 · source

dotnet add package Microsoft.NetCore.App.Runtime.linux-arm64 --version 10.0.6

NuGet (.NET) · Microsoft.NetCore.App.Runtime.linux-musl-x64 · FIXED · 10.0.6 · vulnerable: >= 10.0.0, <= 10.0.5 · source

dotnet add package Microsoft.NetCore.App.Runtime.linux-musl-x64 --version 10.0.6

NuGet (.NET) · Microsoft.NetCore.App.Runtime.linux-musl-arm64 · FIXED · 10.0.6 · vulnerable: >= 10.0.0, <= 10.0.5 · source

dotnet add package Microsoft.NetCore.App.Runtime.linux-musl-arm64 --version 10.0.6

NuGet (.NET) · Microsoft.NetCore.App.Runtime.linux-x64 · FIXED · 10.0.6 · vulnerable: >= 10.0.0, <= 10.0.5 · source

dotnet add package Microsoft.NetCore.App.Runtime.linux-x64 --version 10.0.6

Fedora ELN · openbao · FIXED · 2.6.5-1.eln159 · FEDORA-2026-77adf886ae · source

sudo dnf upgrade --advisory=FEDORA-2026-77adf886ae

Fedora 46 · sugar-turtleart · FIXED · 220-16.fc46 · FEDORA-2026-b79483c788 · source

sudo dnf upgrade --advisory=FEDORA-2026-b79483c788

RHEL 10 · dotnet10.0 · FIXED · dotnet10.0-10.0.106-1.el10_1

sudo dnf upgrade --advisory=RHSA-2026:8467 rpm -q dotnet10.0

RHEL 10 · dotnet8.0 · FIXED · dotnet8.0-8.0.126-1.el10_1

sudo dnf upgrade --advisory=RHSA-2026:8470 rpm -q dotnet8.0

RHEL 10 · dotnet9.0 · FIXED · dotnet9.0-9.0.116-1.el10_1

sudo dnf upgrade --advisory=RHSA-2026:8472 rpm -q dotnet9.0

RHEL 10.0 Extended Update Support · dotnet9.0 · FIXED · dotnet9.0-9.0.116-1.el10_0

sudo dnf upgrade --advisory=RHSA-2026:13280 rpm -q dotnet9.0

RHEL 10.0 Extended Update Support · dotnet8.0 · FIXED · dotnet8.0-8.0.126-1.el10_0

sudo dnf upgrade --advisory=RHSA-2026:13281 rpm -q dotnet8.0

Alpine 3.20 · dotnet8-runtime · FIXED · dotnet8-runtime-8.0.26-r0

apk add --upgrade dotnet8-runtime apk info -v dotnet8-runtime

Alpine 3.21 · dotnet8-runtime · FIXED · dotnet8-runtime-8.0.26-r0

apk add --upgrade dotnet8-runtime apk info -v dotnet8-runtime

Alpine 3.21 · dotnet9-runtime · FIXED · dotnet9-runtime-9.0.15-r0

apk add --upgrade dotnet9-runtime apk info -v dotnet9-runtime

Alpine 3.22 · dotnet8-runtime · FIXED · dotnet8-runtime-8.0.26-r0

apk add --upgrade dotnet8-runtime apk info -v dotnet8-runtime

Amazon Linux 2023 · see advisory · FIXED · ALAS2023-2026-1629 · source

sudo dnf update --advisory=ALAS2023-2026-1629

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-32178?

.net: upgrade to 8.0.26, 9.0.15, 10.0.6; visual studio 2022: upgrade to 17.12.19, 17.14.30. Exact commands for each OS are on this page.

Is CVE-2026-32178 being exploited?

CVE-2026-32178 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-32178 affect?

CVE-2026-32178 affects .net, visual studio 2022. Severity is high (CVSS 7.5). Improper neutralization of special elements in .NET allows an unauthorized attacker to perform spoofing over a network.

How urgent is CVE-2026-32178?

Priority 57/100. High severity; Remotely exploitable, no login, no user action; On your watchlist

Software pages

Visual Studio vulnerabilities

Related CVEs

CVE-2026-26171 HIGH 7.5 UPGRADE UPGRADE Uncontrolled resource consumption in .NET allows an unauthorized attacker to deny service over a network.
CVE-2026-32203 HIGH 7.5 UPGRADE UPGRADE Stack-based buffer overflow in .NET and Visual Studio allows an unauthorized attacker to deny service over a n
CVE-2026-42899 HIGH 7.5 UPGRADE Loop with unreachable exit condition ('infinite loop') in ASP.NET Core allows an unauthorized attacker to deny
CVE-2026-35433 HIGH 7.3 DOWNGRADE UPGRADE Improper input validation in .NET allows an unauthorized attacker to elevate privileges locally.
CVE-2026-96960 HIGH 7.5 UPGRADE DOWNGRADE Asymmetric resource consumption (amplification) in .NET allows an unauthorized attacker to deny service over a

References

← Back to latest CVEs