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CVE-2026-66822: Insertion of sensitive information into sent data in .NET allows an unauthorized attacker to disclose informat

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This month
MEDIUM 5.9REMOTEWATCHLIST

CVE-2026-66822 is a medium-severity flaw (CVSS 5.9) affecting affected software. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Insertion of sensitive information into sent data in .NET allows an unauthorized attacker to disclose information over a network.

Why this priority

  • Remotely exploitable, no login, no user action
  • On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score5.9 (Medium)
Attack vectorNetwork (remote)
Attack complexityHigh
Privileges neededNone
User interactionNone
EPSS exploit chance0.7% (top 48%)
CISA exploited listNo
WeaknessCWE-201
Published2026-10-13
Last modified2026-10-22
Publisher (CNA): Microsoft Corporation

Last updated 2026-10-22 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Timeline

Exact fixes by distribution

NuGet (.NET) · Microsoft.NETCore.App.Runtime.linux-arm · FIXED · 9.0.21 · vulnerable: >= 9.0.0, <= 9.0.20 · source
dotnet add package Microsoft.NETCore.App.Runtime.linux-arm --version 9.0.21
NuGet (.NET) · Microsoft.NETCore.App.Runtime.linux-arm64 · FIXED · 9.0.21 · vulnerable: >= 9.0.0, <= 9.0.20 · source
dotnet add package Microsoft.NETCore.App.Runtime.linux-arm64 --version 9.0.21
NuGet (.NET) · Microsoft.NETCore.App.Runtime.linux-musl-arm · FIXED · 9.0.21 · vulnerable: >= 9.0.0, <= 9.0.20 · source
dotnet add package Microsoft.NETCore.App.Runtime.linux-musl-arm --version 9.0.21
NuGet (.NET) · Microsoft.NETCore.App.Runtime.linux-musl-arm64 · FIXED · 9.0.21 · vulnerable: >= 9.0.0, <= 9.0.20 · source
dotnet add package Microsoft.NETCore.App.Runtime.linux-musl-arm64 --version 9.0.21
NuGet (.NET) · Microsoft.NETCore.App.Runtime.linux-musl-x64 · FIXED · 9.0.21 · vulnerable: >= 9.0.0, <= 9.0.20 · source
dotnet add package Microsoft.NETCore.App.Runtime.linux-musl-x64 --version 9.0.21
NuGet (.NET) · Microsoft.NETCore.App.Runtime.linux-x64 · FIXED · 9.0.21 · vulnerable: >= 9.0.0, <= 9.0.20 · source
dotnet add package Microsoft.NETCore.App.Runtime.linux-x64 --version 9.0.21
Fedora 46 · kwin-zones · FIXED · 1.0.13-1.fc46 · FEDORA-2026-95888f332b · source
sudo dnf upgrade --advisory=FEDORA-2026-95888f332b
Fedora ELN · nginx-mod-brotli · FIXED · 1.0.0~rc-16.eln159 · FEDORA-2026-501a6a8273 · source
sudo dnf upgrade --advisory=FEDORA-2026-501a6a8273
Ubuntu 22.04 · dotnet6 · DEFERRED
Ubuntu 22.04 · dotnet8 · FIXED · 8.0.132-8.0.32-0ubuntu1~22.04.1
sudo apt update && sudo apt install --only-upgrade dotnet8 dpkg --compare-versions "$(dpkg-query -W -f='${Version}' dotnet8)" ge "8.0.132-8.0.32-0ubuntu1~22.04.1" && echo PATCHED || echo STILL-VULNERABLE
Ubuntu 24.04 · dotnet8 · FIXED · 8.0.132-8.0.32-0ubuntu1~24.04.1
sudo apt update && sudo apt install --only-upgrade dotnet8 dpkg --compare-versions "$(dpkg-query -W -f='${Version}' dotnet8)" ge "8.0.132-8.0.32-0ubuntu1~24.04.1" && echo PATCHED || echo STILL-VULNERABLE
Ubuntu 24.04 · dotnet10 · FIXED · 10.0.113-10.0.13-0ubuntu1~24.04.1
sudo apt update && sudo apt install --only-upgrade dotnet10 dpkg --compare-versions "$(dpkg-query -W -f='${Version}' dotnet10)" ge "10.0.113-10.0.13-0ubuntu1~24.04.1" && echo PATCHED || echo STILL-VULNERABLE
RHEL 10 · dotnet8.0 · FIXED · dotnet8.0-8.0.132-1.el10_2
sudo dnf upgrade --advisory=RHSA-2026:86168 rpm -q dotnet8.0
RHEL 10 · dotnet9.0 · FIXED · dotnet9.0-9.0.122-1.el10_2
sudo dnf upgrade --advisory=RHSA-2026:86172 rpm -q dotnet9.0
RHEL 10 · dotnet10.0 · FIXED · dotnet10.0-10.0.113-1.el10_2
sudo dnf upgrade --advisory=RHSA-2026:86195 rpm -q dotnet10.0
RHEL 10.0 Extended Update Support · dotnet9.0 · FIXED · dotnet9.0-9.0.122-1.el10_0
sudo dnf upgrade --advisory=RHSA-2026:88424 rpm -q dotnet9.0
RHEL 10.0 Extended Update Support · dotnet8.0 · FIXED · dotnet8.0-8.0.132-1.el10_0
sudo dnf upgrade --advisory=RHSA-2026:88474 rpm -q dotnet8.0
Alpine 3.22 · dotnet8-runtime · FIXED · dotnet8-runtime-8.0.32-r0
apk add --upgrade dotnet8-runtime apk info -v dotnet8-runtime
Alpine 3.22 · dotnet9-runtime · FIXED · dotnet9-runtime-9.0.21-r0
apk add --upgrade dotnet9-runtime apk info -v dotnet9-runtime
Alpine 3.23 · dotnet10-runtime · FIXED · dotnet10-runtime-10.0.13-r0
apk add --upgrade dotnet10-runtime apk info -v dotnet10-runtime
Alpine 3.23 · dotnet8-runtime · FIXED · dotnet8-runtime-8.0.32-r0
apk add --upgrade dotnet8-runtime apk info -v dotnet8-runtime
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-2026-66822?

No fixed release is listed yet. Watch the vendor advisory and apply any mitigation shown on this page.

Is CVE-2026-66822 being exploited?

CVE-2026-66822 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-2026-66822 affect?

CVE-2026-66822 affects affected software. Severity is medium (CVSS 5.9). Insertion of sensitive information into sent data in .NET allows an unauthorized attacker to disclose information over a network.

How urgent is CVE-2026-66822?

Priority 44/100. Remotely exploitable, no login, no user action; On your watchlist

References

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