CVE-2026-70354: .NET Core Remote Code Execution Vulnerability

Published Aug 11, 2026
·
Updated

.NET Core Remote Code Execution Vulnerability

Other sources

Out-of-bounds write in .NET allows an unauthorized attacker to execute code locally.

— Microsoft

Affected Software

28 affected componentsFixes available
Microsoft .NET Framework=3.5, =4.6.2, =4.7, =4.7.1, =4.7.2
2.0.50727.8984 & 3.0.30729.8980 & 4.7.4144.0
Microsoft .NET Framework=3.5
2.0.50727.8984 & 3.0.30729.8980
Microsoft .NET Framework=3.5
2.0.50727.8984 & 3.0.30729.8980
Microsoft .NET Framework=4.8.1
4.8.9344.0
Microsoft .NET Framework=3.5
2.0.50727.9183 & 3.0.30729.9169
Microsoft .NET Framework=4.8
4.8.4805.0
Microsoft .NET Framework=4.6.2, =4.7, =4.7.1, =4.7.2
4.7.4144.0
Microsoft .NET Framework=3.5, =4.8.1
2.0.50727.9183 & 3.0.30729.9169 & 4.8.9343.0
Microsoft .NET Framework=3.5, =4.8.1
2.0.50727.9183 & 3.0.30729.9169 & 4.8.9344.0
Microsoft .NET Framework=3.5, =4.8.1
2.0.50727.9183 & 3.0.30729.9169 & 4.8.9343.0
Microsoft .NET 9.0 installed on Linux<9.0.19
9.0.19
Microsoft .NET 9.0 installed on Mac OS<9.0.19
9.0.19
Microsoft .NET 8.0 installed on Windows<8.0.30
8.0.30
Microsoft .NET Framework=3.5, =4.8
2.0.50727.9070 & 3.0.30729.9068 & 4.8.4805.0
Microsoft .NET 8.0 installed on Mac OS<8.0.30
8.0.30
Microsoft .NET Framework=3.5, =4.7.2
2.0.50727.9070 & 3.0.30729.9068 & 4.7.4144.0
Microsoft .NET 9.0 installed on Windows<9.0.19
9.0.19
Microsoft .NET 10.0 installed on Linux<10.0.11
10.0.11
Microsoft .NET 10.0 installed on Windows<10.0.11
10.0.11
Microsoft .NET 8.0 installed on Linux<8.0.30
8.0.30
Microsoft Visual Studio 2022=17.14
17.14.38
Microsoft Visual Studio 2026=18.8
18.8.3
Microsoft .NET Framework=4.8
4.8.4805.0
Microsoft .NET Framework=4.8
4.8.4805.0
Microsoft .NET 10.0 installed on Mac OS<10.0.11
10.0.11
Microsoft .NET Framework=3.5, =4.8.1
2.0.50727.9183 & 3.0.30729.9169 & 4.8.9343.0
Microsoft .NET Framework=4.6.2, =4.7, =4.7.1, =4.7.2
4.7.4144.0
Microsoft .NET Framework=3.5, =4.8
2.0.50727.9183 & 3.0.30729.9169 & 4.8.4805.0

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 2.0.50727.8984 & 3.0.30729.8980 & 4.7.4144.0Patch KB5120418
  2. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 2.0.50727.8984 & 3.0.30729.8980Patch KB5120716
  3. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 2.0.50727.8984 & 3.0.30729.8980Patch KB5120695
  4. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 2.0.50727.9183 & 3.0.30729.9169Patch KB5120747
  5. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 4.8.9344.0Patch KB5120711
  6. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 4.8.4805.0Patch KB5120706
  7. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 4.7.4144.0Patch KB5120699
  8. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 2.0.50727.9183 & 3.0.30729.9169 & 4.8.9343.0Patch KB5120713
  9. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 2.0.50727.9183 & 3.0.30729.9169 & 4.8.9344.0Patch KB5120708
  10. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 2.0.50727.9183 & 3.0.30729.9169 & 4.8.9343.0Patch KB5120710
  11. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 9.0.19Patch KB5122105
  12. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 8.0.30Patch KB5122104
  13. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 2.0.50727.9070 & 3.0.30729.9068 & 4.7.4144.0Patch KB5120698
  14. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 2.0.50727.9070 & 3.0.30729.9068 & 4.8.4805.0Patch KB5120703
  15. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 10.0.11Patch KB5122106
  16. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 18.8.3
  17. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 17.14.38
  18. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 4.8.4805.0Patch KB5120702
  19. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 4.8.4805.0Patch KB5120704
  20. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 2.0.50727.9183 & 3.0.30729.9169 & 4.8.9343.0Patch KB5120709
  21. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 4.7.4144.0Patch KB5120700
  22. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 2.0.50727.9183 & 3.0.30729.9169 & 4.8.4805.0Patch KB5120701
  23. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 2.0.50727.9183 & 3.0.30729.9169 & 4.8.9343.0Patch KB5120714
  24. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 2.0.50727.9183 & 3.0.30729.9169 & 4.8.4805.0Patch KB5120705

Event History

Aug 11, 2026
CVE Published
via Microsoft·02:00 PM
Data Sourced
via Microsoft·02:00 PM
DescriptionSeverityWeakness
Data Sourced
via Microsoft·02:00 PM
Affected Software
Updated
via Microsoft·02:00 PM
Description
CVE Published
via MITRE·05:07 PM
Data Sourced
via MITRE·05:07 PM
DescriptionSeverity
Data Sourced
via NVD·05:19 PM
DescriptionSeverityWeakness
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Frequently Asked Questions

1

What is the severity of CVE-2026-70354?

CVE-2026-70354 has a high severity rating of 7.8.

2

How do I fix CVE-2026-70354?

To fix CVE-2026-70354, apply the latest security updates for the affected .NET versions provided by Microsoft.

3

What software is affected by CVE-2026-70354?

CVE-2026-70354 affects Microsoft .NET 8.0, 9.0, and 10.0 across various operating systems including Windows, Mac OS, and Linux.

4

What type of vulnerability is CVE-2026-70354?

CVE-2026-70354 is a remote code execution vulnerability due to an out-of-bounds write in .NET.

5

Who can exploit CVE-2026-70354?

An unauthorized attacker can exploit CVE-2026-70354 to execute code locally on vulnerable systems.

Company

Resources

Contact

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