CVE-2026-83520: Deserialization of untrusted data in .NET allows an unauthorized attacker to execute code over a network.

Q: How do I fix CVE-2026-83520?

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

Q: Is CVE-2026-83520 being exploited?

CVE-2026-83520 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-2026-83520 affect?

CVE-2026-83520 affects affected software. Severity is high (CVSS 8.8). Deserialization of untrusted data in .NET allows an unauthorized attacker to execute code over a network.

Q: How urgent is CVE-2026-83520?

Priority 53/100. High severity; On your watchlist

This month

HIGH 8.8WATCHLIST

CVE-2026-83520 is a high-severity flaw (CVSS 8.8) affecting affected software. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Deserialization of untrusted data in .NET allows an unauthorized attacker to execute code over a network.

Why this priority

High severity
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	8.8 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	1.3% (top 30%)
CISA exploited list	No
Weakness	CWE-502
Published	2026-10-13
Last modified	2026-10-22

Publisher (CNA): Microsoft Corporation

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

Timeline

2026-10-13Published CVE record published
2026-10-22 22:18 UTCUpdated Record last modified

Exact fixes by distribution

NuGet (.NET) · Microsoft.WindowsDesktop.App.Runtime.win-arm64 · FIXED · 11.0.0-rc.2 · vulnerable: >= 11.0.0-preview.1, <= 11.0.0-rc.1 · source

dotnet add package Microsoft.WindowsDesktop.App.Runtime.win-arm64 --version 11.0.0-rc.2

NuGet (.NET) · Microsoft.WindowsDesktop.App.Runtime.win-x64 · FIXED · 11.0.0-rc.2 · vulnerable: >= 11.0.0-preview.1, <= 11.0.0-rc.1 · source

dotnet add package Microsoft.WindowsDesktop.App.Runtime.win-x64 --version 11.0.0-rc.2

NuGet (.NET) · Microsoft.WindowsDesktop.App.Runtime.win-x86 · FIXED · 11.0.0-rc.2 · vulnerable: >= 11.0.0-preview.1, <= 11.0.0-rc.1 · source

dotnet add package Microsoft.WindowsDesktop.App.Runtime.win-x86 --version 11.0.0-rc.2

Ubuntu 22.04 · dotnet6 · NOT AFFECTED

Ubuntu 22.04 · dotnet8 · NOT AFFECTED

Ubuntu 24.04 · dotnet8 · NOT AFFECTED

Ubuntu 24.04 · dotnet10 · NOT AFFECTED

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-2026-83520?

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

Is CVE-2026-83520 being exploited?

CVE-2026-83520 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-2026-83520 affect?

CVE-2026-83520 affects affected software. Severity is high (CVSS 8.8). Deserialization of untrusted data in .NET allows an unauthorized attacker to execute code over a network.

How urgent is CVE-2026-83520?

Priority 53/100. High severity; On your watchlist

References

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