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CVE-2026-87697· NVD / CVE Program· CNA microsoft

.NET Remote Code Execution Vulnerability

Noroxi assessment

Priority: Monitor (action score 35/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.84% (FIRST EPSS); higher than 57% of all records.
  • Anyone who can reach it over the internet can trigger it. No account or password is required. A user must open a link or visit a page. No special conditions are required; it is repeatable.
  • Fixed version: .NET 10.0 installed on Windows 10.0.13; .NET 11.0 installed on Windows 11.0.0-rc.2; .NET 8.0 installed on Windows 8.0.32.

Low priority for now. Upgrade to .NET 10.0 installed on Windows 10.0.13; .NET 11.0 installed on Windows 11.0.0-rc.2; .NET 8.0 installed on Windows 8.0.32 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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

HighCVSS 8.8 · v3.1—No exploit Fix available
Published
Oct 13, 2026
Updated
Oct 14, 2026
EPSS
0.8% · 57th percentile

Report tools

JSON

Action score

35

Monitor

Low priority for now.

CVSS
35 / 40 · 8.8 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.8%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
total

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · microsoft
8.8
NVD has not scored this yet; the score shown is the CNA’s.

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2026-87697

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

—

Versions reported by the vendor

Affected version ranges reported by the assigning authority (microsoft). Independent of NVD's CPE analysis and usually ahead of it.

  • Microsoft .NET 10.0

    • 10.0.0 and later · before 10.0.13affected

  • Microsoft .NET 11.0

    • 11.0.0 and later · before 11.0.0-rc.2affected

  • Microsoft .NET 8.0

    • 8.0.0 and later · before 8.0.32affected

  • Microsoft .NET 9.0

    • 9.0.0 and later · before 9.0.21affected

  • Microsoft Microsoft Visual Studio 2022 version 17.14

    • 17.14.0 and later · before 17.14.42affected

  • Microsoft Microsoft Visual Studio 2026 version 18.10

    • 18.10.0 and later · before 18.10.4affected

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
NuGetMicrosoft.WindowsDesktop.App.Runtime.win-arm64from 10.0.0 · before 10.0.1310.0.13
NuGetMicrosoft.WindowsDesktop.App.Runtime.win-arm64from 11.0.0-preview.1 · before 11.0.0-rc.211.0.0-rc.2
NuGetMicrosoft.WindowsDesktop.App.Runtime.win-arm64from 8.0.0 · before 8.0.328.0.32
NuGetMicrosoft.WindowsDesktop.App.Runtime.win-arm64from 9.0.0 · before 9.0.219.0.21
NuGetMicrosoft.WindowsDesktop.App.Runtime.win-x64from 10.0.0 · before 10.0.1310.0.13
NuGetMicrosoft.WindowsDesktop.App.Runtime.win-x64from 11.0.0-preview.1 · before 11.0.0-rc.211.0.0-rc.2
NuGetMicrosoft.WindowsDesktop.App.Runtime.win-x64from 8.0.0 · before 8.0.328.0.32
NuGetMicrosoft.WindowsDesktop.App.Runtime.win-x64from 9.0.0 · before 9.0.219.0.21
NuGetMicrosoft.WindowsDesktop.App.Runtime.win-x86from 10.0.0 · before 10.0.1310.0.13
NuGetMicrosoft.WindowsDesktop.App.Runtime.win-x86from 11.0.0-preview.1 · before 11.0.0-rc.211.0.0-rc.2
NuGetMicrosoft.WindowsDesktop.App.Runtime.win-x86from 8.0.0 · before 8.0.328.0.32
NuGetMicrosoft.WindowsDesktop.App.Runtime.win-x86from 9.0.0 · before 9.0.219.0.21

Same product

microsoft: all records

Other highest-scoring records for the same primary product.

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
.NET 10.0 installed on Windows10.0.13 · Release NotesMicrosoft (MSRC)
.NET 11.0 installed on Windows11.0.0-rc.2 · Release NotesMicrosoft (MSRC)
.NET 8.0 installed on Windows8.0.32 · Release NotesMicrosoft (MSRC)
.NET 9.0 installed on Windows9.0.21 · Release NotesMicrosoft (MSRC)
Microsoft Visual Studio 2022 version 17.1417.14.42 · Release NotesMicrosoft (MSRC)
Microsoft Visual Studio 2026 version 18.1018.10.4 · Release NotesMicrosoft (MSRC)
NuGet:Microsoft.WindowsDesktop.App.Runtime.win-arm6410.0.13Package registry (OSV)
NuGet:Microsoft.WindowsDesktop.App.Runtime.win-arm6411.0.0-rc.2Package registry (OSV)
NuGet:Microsoft.WindowsDesktop.App.Runtime.win-arm648.0.32Package registry (OSV)
NuGet:Microsoft.WindowsDesktop.App.Runtime.win-arm649.0.21Package registry (OSV)
NuGet:Microsoft.WindowsDesktop.App.Runtime.win-x6410.0.13Package registry (OSV)
NuGet:Microsoft.WindowsDesktop.App.Runtime.win-x6411.0.0-rc.2Package registry (OSV)
NuGet:Microsoft.WindowsDesktop.App.Runtime.win-x648.0.32Package registry (OSV)
NuGet:Microsoft.WindowsDesktop.App.Runtime.win-x649.0.21Package registry (OSV)
NuGet:Microsoft.WindowsDesktop.App.Runtime.win-x8610.0.13Package registry (OSV)
NuGet:Microsoft.WindowsDesktop.App.Runtime.win-x8611.0.0-rc.2Package registry (OSV)
NuGet:Microsoft.WindowsDesktop.App.Runtime.win-x868.0.32Package registry (OSV)
NuGet:Microsoft.WindowsDesktop.App.Runtime.win-x869.0.21Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

  1. Published
  2. Fix recordedsame day
  3. TodayOct 15, 2026+2 d
EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

  • CVE-2026-700350 days apart.NET Framework Remote Code Execution Vulnerability
    35Monitor
  • CVE-2026-835200 days apart.NET Remote Code Execution Vulnerability
    35Monitor

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • A user must open a link or visit a page.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · data can be read
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
Required
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

CWE-502 · Deserialization of Untrusted Data

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

nvd-secondary

Root cause

Data received over the network is deserialized into the language’s native object format without verifying its source. Code paths inside the object can be triggered during deserialization.

The bug in code

The whole CWE-502 class

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

Vulnerable

python
payload = sock.recv(65536)job = pickle.loads(payload)

Fixed

python
payload = sock.recv(65536)if not hmac.compare_digest(sign(payload), header_sig):    raise PermissionError("invalid signature")job = JobSchema.validate(json.loads(payload))

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

ATT&CK techniques

—

Change log

  1. Fix✗ → ✓
  2. SSVC exploitation— → none
  3. Exploit maturity— → none

For records you follow, these changes also arrive as notifications. →

References

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records