CVE Intelligence
High Insecure deserialization

CVE-2026-70035 — .NET Framework Remote Code Execution Vulnerability

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

Published Oct 13, 2026 · Updated Oct 14, 2026 · Sources: NIST National Vulnerability Database, CVE Program (cve.org) e CISA ADP, GitHub Security Advisories · CNA: microsoft

Who exploits it and how urgent it is

A 0–100 score combining confirmed exploitation, ransomware and APT use, public exploits, EPSS and severity.

No exploitation signal in the sources consulted so far.
How the score was calculated
  • EPSS 1.3% (30-day exploitation probability)+10
  • Technical severity (high)+6

The score orders the patch queue; it does not replace your asset context (internet exposure, criticality, compensating controls).

Triage

Is it exploited, how likely is exploitation, what does it touch, and how severe do the sources call it.

Exploitation
Not confirmed
Not in CISA KEV — an absence of record, not proof it is unexploited.
EPSS FIRST
1.27%
ahead of 69% of scored CVEs · Oct 14, 2026
Affects
Microsoft
.NET 10.0 and 16 more
CVSS base
8.8
High · 3 source(s)

CISA SSVC assessment CISA

Three decision points CISA publishes for the CVEs it assesses (SSVC 2.0.3). A stakeholder decision, not a severity score.

Exploitation
None
none · proof-of-concept · active
Automatable
No
can an attacker script the kill-chain steps
Technical impact
Total
partial · total control of the vulnerable component

Remediation

Fixes and mitigations documented by the sources — linked to the original advisory.

  • Nuget Microsoft.WindowsDesktop.App.Runtime.win-arm64: fixed in version 10.0.13 — github.com (GitHub Security Advisories)
  • Nuget Microsoft.WindowsDesktop.App.Runtime.win-arm64: fixed in version 8.0.32 — github.com (GitHub Security Advisories)
  • Nuget Microsoft.WindowsDesktop.App.Runtime.win-arm64: fixed in version 9.0.21 — github.com (GitHub Security Advisories)
  • Nuget Microsoft.WindowsDesktop.App.Runtime.win-arm64: fixed in version 11.0.0-rc.2 — github.com (GitHub Security Advisories)
  • Nuget Microsoft.WindowsDesktop.App.Runtime.win-x64: fixed in version 10.0.13 — github.com (GitHub Security Advisories)
  • Nuget Microsoft.WindowsDesktop.App.Runtime.win-x64: fixed in version 8.0.32 — github.com (GitHub Security Advisories)
  • Nuget Microsoft.WindowsDesktop.App.Runtime.win-x64: fixed in version 9.0.21 — github.com (GitHub Security Advisories)
  • Nuget Microsoft.WindowsDesktop.App.Runtime.win-x64: fixed in version 11.0.0-rc.2 — github.com (GitHub Security Advisories)
  • Nuget Microsoft.WindowsDesktop.App.Runtime.win-x86: fixed in version 10.0.13 — github.com (GitHub Security Advisories)
  • Nuget Microsoft.WindowsDesktop.App.Runtime.win-x86: fixed in version 8.0.32 — github.com (GitHub Security Advisories)
  • Nuget Microsoft.WindowsDesktop.App.Runtime.win-x86: fixed in version 9.0.21 — github.com (GitHub Security Advisories)
  • Nuget Microsoft.WindowsDesktop.App.Runtime.win-x86: fixed in version 11.0.0-rc.2 — github.com (GitHub Security Advisories)

First 24 hours

Ordered from the record’s own fields — exposure first, because you cannot patch what you have not found. A rule-generated starting point.

  1. Identify exposed assets running the affected vendor/product/version combinations (Microsoft .NET 10.0, Microsoft .NET 11.0, Microsoft .NET 8.0…).
  2. The attack is network-based and needs no privileges: restrict exposure (ACLs, VPN, WAF) until patched.
  3. Apply the fixed version or the patch documented under Remediation.
  4. Exploitation requires user interaction: tighten email/web filtering and warn affected users.
  5. Search available logs for exploit probes matching the vulnerability class (insecure deserialization), errors and authentication anomalies.

Affected scope

Vendor, product and versions as the sources word them.

VendorProductVersionsStatusSource
Microsoft .NET 10.0 ≥ 10.0.0 and < 10.0.13 Vulnerable CVE Program (cve.org) e CISA ADP
Microsoft .NET 11.0 ≥ 11.0.0 and < 11.0.0-rc.2 Vulnerable CVE Program (cve.org) e CISA ADP
Microsoft .NET 8.0 ≥ 8.0.0 and < 8.0.32 Vulnerable CVE Program (cve.org) e CISA ADP
Microsoft .NET 9.0 ≥ 9.0.0 and < 9.0.21 Vulnerable CVE Program (cve.org) e CISA ADP
Microsoft Microsoft .NET Framework 3.5 ≥ 3.5.0 and < 2.0.50727.9188 AND 3.0.30729.9171 Vulnerable CVE Program (cve.org) e CISA ADP
Microsoft Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2 ≥ 3.0.0.0 and < 2.0.50727.8987 AND 3.0.30729.8982 AND 4.7.4150.0 Vulnerable CVE Program (cve.org) e CISA ADP
Microsoft Microsoft .NET Framework 3.5 AND 4.7.2 ≥ 4.7.0 and < 2.0.50727.9073 AND 3.0.30729.9070 AND 4.7.4150.0 Vulnerable CVE Program (cve.org) e CISA ADP
Microsoft Microsoft .NET Framework 3.5 AND 4.8 ≥ 4.8.0 and < 2.0.50727.9073 AND 3.0.30729.9070 AND 4.8.4811.0 Vulnerable CVE Program (cve.org) e CISA ADP
Microsoft Microsoft .NET Framework 3.5 AND 4.8.1 ≥ 4.8.1 and < 2.0.50727.9188 AND 3.0.30729.9171 AND 4.8.9363.0 Vulnerable CVE Program (cve.org) e CISA ADP
Microsoft Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2 ≥ 4.7.0 and < 4.7.4150.0 Vulnerable CVE Program (cve.org) e CISA ADP
Microsoft Microsoft .NET Framework 4.8 ≥ 4.8.0 and < 4.8.4811.0 Vulnerable CVE Program (cve.org) e CISA ADP
Microsoft Microsoft .NET Framework 4.8.1 ≥ 4.8.0.0 and < 4.8.9363.0 Vulnerable CVE Program (cve.org) e CISA ADP
Microsoft Microsoft Visual Studio 2022 version 17.14 ≥ 17.14.0 and < 17.14.42 Vulnerable CVE Program (cve.org) e CISA ADP
Microsoft Microsoft Visual Studio 2026 version 18.10 ≥ 18.10.0 and < 18.10.4 Vulnerable CVE Program (cve.org) e CISA ADP
Nuget Microsoft.WindowsDesktop.App.Runtime.win-arm64 ≥ 11.0.0-preview.1 and ≤ 11.0.0-rc.1≥ 9.0.0 and ≤ 9.0.20≥ 8.0.0 and ≤ 8.0.31≥ 10.0.0 and ≤ 10.0.12 Vulnerable GitHub Security Advisories
Nuget Microsoft.WindowsDesktop.App.Runtime.win-x64 ≥ 10.0.0 and ≤ 10.0.12≥ 8.0.0 and ≤ 8.0.31≥ 9.0.0 and ≤ 9.0.20≥ 11.0.0-preview.1 and ≤ 11.0.0-rc.1 Vulnerable GitHub Security Advisories
Nuget Microsoft.WindowsDesktop.App.Runtime.win-x86 ≥ 10.0.0 and ≤ 10.0.12≥ 8.0.0 and ≤ 8.0.31≥ 9.0.0 and ≤ 9.0.20≥ 11.0.0-preview.1 and ≤ 11.0.0-rc.1 Vulnerable GitHub Security Advisories

Attack characteristics

The CVSS vector, decoded. It describes the attack, not your exposure to it.

Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Every base score collected

Sources score independently and may disagree; each row says who scored it and under which version.

ScoreVersionSeverityExpl.ImpactScored by
8.8 CVSS 3.1 High 2.8 5.9 secure@microsoft.com via NIST National Vulnerability Database
8.8 CVSS 3.1 High — — GitHub, Inc. via GitHub Security Advisories
8.8 CVSS 3.1 High — — microsoft via CVE Program (cve.org) e CISA ADP
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H (score shown at the top: secure@microsoft.com)

Weakness MITRE

Weakness class according to MITRE’s CWE catalog.

CWE-502 · Deserialization of Untrusted Data

Other CVEs with this weakness →

Detection

Read off the CVSS vector and the weakness class. Starting points, not tested rules.

  • Prioritize edge telemetry for the network-reachable component (proxy, WAF, IDS/IPS).
  • Monitor serialized objects in requests and unexpected processes spawned by the runtime.
web/proxy/WAF logsnetwork IDS/IPSendpoint telemetry (EDR)application logs

Timeline

What happened to this CVE, newest first.

  • 2026
  • Fix documented
    Oct 14, 2026 · GitHub Security Advisories
  • Affected products added · nuget/microsoft.windowsdesktop.app.runtime.win-arm64, nuget/microsoft.windowsdesktop.app.runtime.win-x64, nuget/microsof
    Oct 14, 2026 · GitHub Security Advisories
  • SSVC assessment updated
    Oct 13, 2026 · CVE Program (cve.org) e CISA ADP
  • Affected products added · microsoft/.net 10.0, microsoft/.net 11.0, microsoft/.net 8.0, microsoft/.net 9.0, microsoft/microsoft .net framework 3.5
    Oct 13, 2026 · CVE Program (cve.org) e CISA ADP
  • Record published
    Oct 13, 2026
  • CVSS changed · 8.8
    Oct 13, 2026 · NIST National Vulnerability Database
  • Source status changed · → Awaiting Analysis
    Oct 13, 2026 · NIST National Vulnerability Database
  • Record created in this database
    Oct 13, 2026 · NIST National Vulnerability Database
  • CVE published
    Oct 13, 2026 · microsoft

Source activity

Repeated readings are counted rather than listed.

  • 1× References added · Oct 14, 2026 – Oct 14, 2026
  • 1× Official description updated · Oct 13, 2026 – Oct 13, 2026

References

5 on the record

Elsewhere on this site

Microsoft
every CVE for this vendor
Insecure deserialization
same class
CWE-502
other pages naming this weakness

Related CVEs (same products)

Not in any source we poll

Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.

  • No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
  • No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
  • No exploit packet captures, log samples, or incident case IDs supplied.

Answered from this record

Text assembled only from the fields above — no additional claims.

What should defenders know first?

CVE-2026-70035 is ".NET Framework Remote Code Execution Vulnerability", rated High. It affects .NET 10.0 (Microsoft); versions are in the scope table. It is not in CISA KEV, which does not rule out exploitation. CVSS 8.8 describes technical severity. EPSS 1.27% estimates the probability of exploitation in 30 days; neither replaces your asset context. First verify whether exposed or business-critical assets run the affected versions, apply vendor fixes or mitigations, and preserve logs for review.

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