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CVE-2026-87697ImportantRCENetworkRevised 15 Oct

.NET Remote Code Execution Vulnerability

MSRC advisory NVD CVE.org

Assessment

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

Severity
Important
CVSS base score
8.8CVSS:3.1/AV:N/AC:L/PR:N/UI:R/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 57.7% 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-502: Deserialization of Untrusted Data
Issued by
Microsoft
Published
13 Oct 2026 · October 2026
Last revised
15 Oct 2026Updated 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.
CVSS 3.1 base metricsRed raises the risk · green lowers it
Attack vector
NetworkAV:N
Attack complexity
LowAC:L
Privileges required
NonePR:N
User interaction
RequiredUI:R
Scope
UnchangedS:U
Confidentiality
HighC:H
Integrity
HighI:H
Availability
HighA:H

Updates that fix it

3 KBs
KBTypeRestartApplies toOther CVEs
KB5130034 Security UpdateRequired.NET 8.0 runtime installed on WindowsAll CVEs in KB5130034
KB5130035 Security UpdateRequired.NET 9.0 runtime installed on WindowsAll CVEs in KB5130035
KB5130036 Security UpdateRequired.NET 10.0 runtime installed on WindowsAll CVEs in KB5130036

Affected products

Developer Tools
6 affected products

What changed

First observed 14 Oct 2026
  1. 25 Oct 2026 · 17:12:51 UTC EPSS0.8%; scored 24 Oct 2026 → 0.8%; scored 25 Oct 2026
  2. 25 Oct 2026 · 01:34:18 UTC EPSS0.8%; scored 23 Oct 2026 → 0.8%; scored 24 Oct 2026
  3. 23 Oct 2026 · 15:51:28 UTC EPSS0.8%; scored 22 Oct 2026 → 0.8%; scored 23 Oct 2026
  4. 23 Oct 2026 · 09:33:49 UTC Public exploit codeUnknown: exploit-code evidence is incomplete or retained → No Nuclei template listed
  5. 23 Oct 2026 · 09:33:49 UTC CISA KEVUnknown: catalog evidence is incomplete or retained → Not listed in the collected catalog
  6. 23 Oct 2026 · 09:33:49 UTC Source coverage: public-exploit-codeIncomplete → Current
  7. 23 Oct 2026 · 09:33:49 UTC Source coverage: first-epssIncomplete → Current
  8. 23 Oct 2026 · 09:33:49 UTC Source coverage: cisa-kevIncomplete → Current
  9. 23 Oct 2026 · 09:33:49 UTC Source coverage: msrc-cvrfIncomplete → Current
  10. 23 Oct 2026 · 08:31:50 UTC Public exploit codeNo Nuclei template listed → Unknown: exploit-code evidence is incomplete or retained
  11. 23 Oct 2026 · 08:31:50 UTC CISA KEVNot listed in the collected catalog → Unknown: catalog evidence is incomplete or retained
  12. 23 Oct 2026 · 08:31:50 UTC Source coverage: public-exploit-codeCurrent → Incomplete
Show 20 more recent changes
  1. 23 Oct 2026 · 08:31:50 UTCSource coverage: first-epss Current → Incomplete
  2. 23 Oct 2026 · 08:31:50 UTCSource coverage: cisa-kev Current → Incomplete
  3. 23 Oct 2026 · 08:31:50 UTCSource coverage: msrc-cvrf Current → Incomplete
  4. 22 Oct 2026 · 22:02:57 UTCUpdates that fix it KB5130034: .NET 8.0 installed on Windows (restart required); KB5130035: .NET 9.0 installed on Windows (restart required); KB5130036: .NET 10.0 installed on Windows (restart required) → KB5130034: .NET 8.0 runtime installed on Windows (restart required); KB5130035: .NET 9.0 runtime installed on Windows (restart required); KB5130036: .NET 10.0 runtime installed on Windows (restart required)
  5. 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
  6. 22 Oct 2026 · 17:33:15 UTCEPSS 0.8%; scored 21 Oct 2026 → 0.8%; scored 22 Oct 2026
  7. 21 Oct 2026 · 21:47:24 UTCEPSS 0.8%; scored 20 Oct 2026 → 0.8%; scored 21 Oct 2026
  8. 20 Oct 2026 · 20:53:31 UTCEPSS 0.8%; scored 19 Oct 2026 → 0.8%; scored 20 Oct 2026
  9. 19 Oct 2026 · 15:12:40 UTCEPSS 0.8%; scored 18 Oct 2026 → 0.8%; scored 19 Oct 2026
  10. 18 Oct 2026 · 14:54:30 UTCEPSS 0.8%; scored 16 Oct 2026 → 0.8%; scored 18 Oct 2026
  11. 18 Oct 2026 · 14:54:30 UTCLink: October 2026 → /security?release=2026-Oct#cves
  12. 16 Oct 2026 · 16:13:25 UTCEPSS 0.8%; scored 15 Oct 2026 → 0.8%; scored 16 Oct 2026
  13. 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.
  14. 15 Oct 2026 · 21:30:54 UTCLast revised 13 Oct 2026 07:00 UTC → 15 Oct 2026 07:00 UTC
  15. 15 Oct 2026 · 21:30:54 UTCEPSS 0.8%; scored 14 Oct 2026 → 0.8%; scored 15 Oct 2026
  16. 15 Oct 2026 · 21:30:54 UTCUpdates that fix it No KB listed → KB5130034: .NET 8.0 installed on Windows (restart required); KB5130035: .NET 9.0 installed on Windows (restart required); KB5130036: .NET 10.0 installed on Windows (restart required)
  17. 15 Oct 2026 · 21:30:54 UTCLink: KB5130036 → /windows/kb/KB5130036
  18. 15 Oct 2026 · 21:30:54 UTCLink: KB5130035 → /windows/kb/KB5130035
  19. 15 Oct 2026 · 21:30:54 UTCLink: KB5130034 → /windows/kb/KB5130034
  20. 15 Oct 2026 · 01:07:54 UTCEPSS Not scored → 0.8%; scored 14 Oct 2026

The most recent 100 field changes are listed. Complete recorded revisions are kept separately.

Cite this recorded revision to keep the same title, summary, facts and links when the page changes.

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Explore global source statements, affected packages and advisory history for CVE-2026-87697. 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-2026-87697 · Microsoft / collected KEV context

GHSA-c27m-942f-rcfh

cve-program · CVE-2026-87697

nvd · CVE-2026-87697

osv · GHSA-c27m-942f-rcfh

Related operational evidence

Explicit CVE identifiers
ChangeIntel

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