CVE-2026-70007: Out-of-bounds write in .NET Framework allows an unauthorized attacker to execute code over a network.

Q: How do I fix CVE-2026-70007?

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

Q: Is CVE-2026-70007 being exploited?

CVE-2026-70007 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-2026-70007 affect?

CVE-2026-70007 affects affected software. Severity is high (CVSS 8.8). Out-of-bounds write in .NET Framework allows an unauthorized attacker to execute code over a network.

Q: How urgent is CVE-2026-70007?

Priority 48/100. High severity; On your watchlist

This month

HIGH 8.8WATCHLIST

CVE-2026-70007 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.

Out-of-bounds write in .NET Framework 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	0.6% (top 50%)
CISA exploited list	No
Weakness	CWE-787
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 · 9.0.21 · vulnerable: >= 9.0.0, <= 9.0.20 · source

dotnet add package Microsoft.WindowsDesktop.App.Runtime.win-arm64 --version 9.0.21

NuGet (.NET) · Microsoft.WindowsDesktop.App.Runtime.win-x64 · FIXED · 9.0.21 · vulnerable: >= 9.0.0, <= 9.0.20 · source

dotnet add package Microsoft.WindowsDesktop.App.Runtime.win-x64 --version 9.0.21

NuGet (.NET) · Microsoft.WindowsDesktop.App.Runtime.win-x86 · FIXED · 9.0.21 · vulnerable: >= 9.0.0, <= 9.0.20 · source

dotnet add package Microsoft.WindowsDesktop.App.Runtime.win-x86 --version 9.0.21

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-2026-70007?

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

Is CVE-2026-70007 being exploited?

CVE-2026-70007 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-2026-70007 affect?

CVE-2026-70007 affects affected software. Severity is high (CVSS 8.8). Out-of-bounds write in .NET Framework allows an unauthorized attacker to execute code over a network.

How urgent is CVE-2026-70007?

Priority 48/100. High severity; On your watchlist

Software pages

.NET vulnerabilities

References

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