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CVE-2026-70197ImportantRCENetworkRevised 25 Oct

.NET and Visual Studio Remote Code Execution Vulnerability

MSRC advisory NVD CVE.org

Assessment

Out-of-bounds write in .NET allows an unauthorized attacker to execute code over a network.

Severity
Important
CVSS base score
8.1CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
Impact
Remote Code Execution
EPSS, next 30 days
0.8%Higher than 55.9% of scored CVEs · FIRST model run 25 Oct 2026 · about EPSS
Public exploit code
No Nuclei template lists it
Exploitability
Exploitation Less Likely
Publicly disclosed
No
Customer action
Required: apply the update
Component
.NET
Weakness
CWE-787: Out-of-bounds Write
Issued by
Microsoft
Published
13 Oct 2026 · October 2026
Last revised
25 Oct 2026Updated product information in the Software Update table. This is an informational change only.
CVSS 3.1 base metricsRed raises the risk · green lowers it
Attack vector
NetworkAV:N
Attack complexity
HighAC:H
Privileges required
NonePR:N
User interaction
NoneUI:N
Scope
UnchangedS:U
Confidentiality
HighC:H
Integrity
HighI:H
Availability
HighA:H

Updates that fix it

6 KBs
KBTypeRestartApplies toOther CVEs
KB5130034 Security Update—.NET 8.0 runtime installed on WindowsAll CVEs in KB5130034
KB5130035 Security Update—.NET 9.0 runtime installed on WindowsAll CVEs in KB5130035
KB5130036 Security Update—.NET 10.0 runtime installed on WindowsAll CVEs in KB5130036
KB5133964 Security UpdateRequired.NET 8.0 installed on Linux, .NET 8.0 installed on Mac OS, .NET 8.0 installed on WindowsAll CVEs in KB5133964
KB5133965 Security UpdateRequired.NET 9.0 installed on Linux, .NET 9.0 installed on Mac OS, .NET 9.0 installed on WindowsAll CVEs in KB5133965
KB5133966 Security UpdateRequired.NET 10.0 installed on Linux, .NET 10.0 installed on Mac OS, .NET 10.0 installed on WindowsAll CVEs in KB5133966

Affected products

Developer Tools
21 affected products

What changed

First observed 14 Oct 2026
  1. 25 Oct 2026 · 17:12:51 UTC Revision noteMicrosoft is aware that the vulnerability for which this CVE was assigned has not been addressed. We are working to prepare and test a complete mitigation. We will update this document when there is more information. → Updated product information in the Software Update table. This is an informational change only.
  2. 25 Oct 2026 · 17:12:51 UTC Last revised19 Oct 2026 07:00 UTC → 25 Oct 2026 07:00 UTC
  3. 25 Oct 2026 · 17:12:51 UTC EPSS0.7%; scored 24 Oct 2026 → 0.8%; scored 25 Oct 2026
  4. 25 Oct 2026 · 17:12:51 UTC Updates that fix itKB5130034: .NET 8.0 runtime installed on Windows; KB5130035: .NET 9.0 runtime installed on Windows; KB5130036: .NET 10.0 runtime installed on Windows → KB5130034: .NET 8.0 runtime installed on Windows; KB5130035: .NET 9.0 runtime installed on Windows; KB5130036: .NET 10.0 runtime installed on Windows; KB5133964: .NET 8.0 installed on Linux, .NET 8.0 installed on Mac OS, .NET 8.0 installed on Windows (restart required); KB5133965: .NET 9.0 installed on Linux, .NET 9.0 installed on Mac OS, .NET 9.0 installed on Windows (restart required); KB5133966: .NET 10.0 installed on Linux, .NET 10.0 installed on Mac OS, .NET 10.0 installed on Windows (restart required)
  5. 25 Oct 2026 · 17:12:51 UTC Affected products.NET 10.0 runtime installed on Windows, .NET 11.0 runtime installed on Windows, .NET 8.0 runtime installed on Windows, .NET 9.0 runtime installed on Windows, Microsoft Visual Studio 2022 version 17.14, Microsoft Visual Studio 2026 version 18.10 → .NET 10.0 installed on Linux, .NET 10.0 installed on Mac OS, .NET 10.0 installed on Windows, .NET 10.0 runtime installed on Windows, .NET 11.0 installed on Linux, .NET 11.0 installed on Mac OS, .NET 11.0 installed on Windows, .NET 11.0 runtime installed on Windows, .NET 8.0 installed on Linux, .NET 8.0 installed on Mac OS, .NET 8.0 installed on Windows, .NET 8.0 runtime installed on Windows, .NET 9.0 installed on Linux, .NET 9.0 installed on Mac OS, .NET 9.0 installed on Windows, .NET 9.0 runtime installed on Windows, Microsoft Visual Studio 2019 version 16.11, Microsoft Visual Studio 2022 version 17.14, Microsoft Visual Studio 2026 version 18.10, Microsoft Visual Studio 2026 version 18.11, Microsoft Visual Studio 2026 version 18.12
  6. 25 Oct 2026 · 17:12:51 UTC Link: KB5133966/windows/kb/KB5133966
  7. 25 Oct 2026 · 17:12:51 UTC Link: KB5133965/windows/kb/KB5133965
  8. 25 Oct 2026 · 17:12:51 UTC Link: KB5133964/windows/kb/KB5133964
  9. 25 Oct 2026 · 17:12:51 UTC Title.NET Remote Code Execution Vulnerability → .NET and Visual Studio Remote Code Execution Vulnerability
  10. 25 Oct 2026 · 01:34:18 UTC EPSS0.7%; scored 23 Oct 2026 → 0.7%; scored 24 Oct 2026
  11. 23 Oct 2026 · 15:51:28 UTC EPSS0.7%; scored 22 Oct 2026 → 0.7%; scored 23 Oct 2026
  12. 23 Oct 2026 · 09:33:49 UTC Public exploit codeUnknown: exploit-code evidence is incomplete or retained → No Nuclei template listed
Show 28 more recent changes
  1. 23 Oct 2026 · 09:33:49 UTCCISA KEV Unknown: catalog evidence is incomplete or retained → Not listed in the collected catalog
  2. 23 Oct 2026 · 09:33:49 UTCSource coverage: public-exploit-code Incomplete → Current
  3. 23 Oct 2026 · 09:33:49 UTCSource coverage: first-epss Incomplete → Current
  4. 23 Oct 2026 · 09:33:49 UTCSource coverage: cisa-kev Incomplete → Current
  5. 23 Oct 2026 · 09:33:49 UTCSource coverage: msrc-cvrf Incomplete → Current
  6. 23 Oct 2026 · 08:31:50 UTCPublic exploit code No Nuclei template listed → Unknown: exploit-code evidence is incomplete or retained
  7. 23 Oct 2026 · 08:31:50 UTCCISA KEV Not listed in the collected catalog → Unknown: catalog evidence is incomplete or retained
  8. 23 Oct 2026 · 08:31:50 UTCSource coverage: public-exploit-code Current → Incomplete
  9. 23 Oct 2026 · 08:31:50 UTCSource coverage: first-epss Current → Incomplete
  10. 23 Oct 2026 · 08:31:50 UTCSource coverage: cisa-kev Current → Incomplete
  11. 23 Oct 2026 · 08:31:50 UTCSource coverage: msrc-cvrf Current → Incomplete
  12. 22 Oct 2026 · 22:02:57 UTCUpdates that fix it KB5130034: .NET 8.0 installed on Windows; KB5130035: .NET 9.0 installed on Windows; KB5130036: .NET 10.0 installed on Windows → KB5130034: .NET 8.0 runtime installed on Windows; KB5130035: .NET 9.0 runtime installed on Windows; KB5130036: .NET 10.0 runtime installed on Windows
  13. 22 Oct 2026 · 22:02:57 UTCAffected products .NET 10.0 installed on Windows, .NET 11.0 installed on Windows, .NET 8.0 installed on Windows, .NET 9.0 installed on Windows, Microsoft Visual Studio 2022 version 17.14, Microsoft Visual Studio 2026 version 18.10 → .NET 10.0 runtime installed on Windows, .NET 11.0 runtime installed on Windows, .NET 8.0 runtime installed on Windows, .NET 9.0 runtime installed on Windows, Microsoft Visual Studio 2022 version 17.14, Microsoft Visual Studio 2026 version 18.10
  14. 22 Oct 2026 · 17:33:15 UTCEPSS 0.7%; scored 21 Oct 2026 → 0.7%; scored 22 Oct 2026
  15. 21 Oct 2026 · 21:47:24 UTCEPSS 0.7%; scored 20 Oct 2026 → 0.7%; scored 21 Oct 2026
  16. 20 Oct 2026 · 20:53:31 UTCEPSS 0.7%; scored 19 Oct 2026 → 0.7%; scored 20 Oct 2026
  17. 20 Oct 2026 · 06:50:25 UTCRevision note Updated an acknowledgement. This is an informational change only. → Microsoft is aware that the vulnerability for which this CVE was assigned has not been addressed. We are working to prepare and test a complete mitigation. We will update this document when there is more information.
  18. 20 Oct 2026 · 06:50:25 UTCLast revised 16 Oct 2026 07:00 UTC → 19 Oct 2026 07:00 UTC
  19. 19 Oct 2026 · 15:12:40 UTCEPSS 0.7%; scored 18 Oct 2026 → 0.7%; scored 19 Oct 2026
  20. 18 Oct 2026 · 14:54:30 UTCEPSS 0.7%; scored 16 Oct 2026 → 0.7%; scored 18 Oct 2026
  21. 18 Oct 2026 · 14:54:30 UTCLink: October 2026 → /security?release=2026-Oct#cves
  22. 16 Oct 2026 · 16:13:25 UTCRevision note Updated the Security Updates table to add KB article links for .NET 11.0 and download and KB article links for Microsoft Visual Studio. This is an informational change only; the fixed builds are unchanged. → Updated an acknowledgement. This is an informational change only.
  23. 16 Oct 2026 · 16:13:25 UTCLast revised 15 Oct 2026 07:00 UTC → 16 Oct 2026 07:00 UTC
  24. 16 Oct 2026 · 16:13:25 UTCEPSS 0.7%; scored 15 Oct 2026 → 0.7%; scored 16 Oct 2026
  25. 15 Oct 2026 · 21:30:54 UTCRevision note Information published. → Updated the Security Updates table to add KB article links for .NET 11.0 and download and KB article links for Microsoft Visual Studio. This is an informational change only; the fixed builds are unchanged.
  26. 15 Oct 2026 · 21:30:54 UTCLast revised 13 Oct 2026 07:00 UTC → 15 Oct 2026 07:00 UTC
  27. 15 Oct 2026 · 21:30:54 UTCEPSS 0.7%; scored 14 Oct 2026 → 0.7%; scored 15 Oct 2026
  28. 15 Oct 2026 · 01:07:54 UTCEPSS Not scored → 0.7%; scored 14 Oct 2026

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Explore global source statements, affected packages and advisory history for CVE-2026-70197. The catalog has a separate collection scope from Microsoft release records.

Explicit identifiers and source references

These records connect through source-stated identifiers. Shared identifiers or dates alone do not establish shared exposure, root cause or applicability.

CVE-2026-70197 · Microsoft / collected KEV context

GHSA-4mpw-cpwj-hxxj

cve-program · CVE-2026-70197

nvd · CVE-2026-70197

osv · GHSA-4mpw-cpwj-hxxj

Related operational evidence

Explicit CVE identifiers
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