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Fencer Vulns
medium 6.5

CVE-2026-70194 json

.NET Framework Security Feature Bypass Vulnerability

published 2026-10-13 26 d ago modified 2026-10-31 8 d ago also GHSA-fqpq-cx42-9jmm , EUVD-2026-99702

cvss
6.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.5%
EPSS 0.5% chance of exploitation in 30 days, percentile 42%
public exploits
0
none known

Summary

Improper certificate validation in .NET Framework allows an unauthorized attacker to bypass a security feature over a network.

Patch / fix

  • nuget Microsoft.NETCore.App.Runtime.linux-arm 11.0.0-rc.2
  • nuget Microsoft.NETCore.App.Runtime.linux-arm64 11.0.0-rc.2
  • nuget Microsoft.NETCore.App.Runtime.linux-musl-arm 11.0.0-rc.2
  • nuget Microsoft.NETCore.App.Runtime.linux-musl-arm64 11.0.0-rc.2
  • nuget Microsoft.NETCore.App.Runtime.linux-musl-x64 11.0.0-rc.2
  • nuget Microsoft.NETCore.App.Runtime.linux-x64 11.0.0-rc.2
  • nuget Microsoft.NETCore.App.Runtime.osx-arm64 11.0.0-rc.2
  • nuget Microsoft.NETCore.App.Runtime.osx-x64 11.0.0-rc.2
  • Microsoft .NET 11.0 runtime 11.0.0-rc.2
  • Microsoft Microsoft Visual Studio 2022 version 17.14 17.14.42
  • Microsoft Microsoft Visual Studio 2026 version 18.10 18.10.4
  • dotnet11 Ubuntu 26.10 11.0.100-11.0.0~rc2-0ubuntu1~26.10.1

ubuntu advisories UBUNTU-CVE-2026-70194

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-70194 updated cvss 6.5

dotnet: .NET Framework Security Feature Bypass Vulnerability

  • Red Hat Hardened Images dotnet8.0 8.0.131-0.1.hum1
    not affected: component not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
25 d ago

Exploit prediction

0.49% chance of exploitation in the next 30 days, higher than 42% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N/E:U/RL:O/RC:C
CNA 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
GitHub 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

Affected packages

ecosystem package affected fixed in
nuget Microsoft.NETCore.App.Runtime.linux-arm
>=11.0.0-preview.1, <11.0.0-rc.2
11.0.0-rc.2
nuget Microsoft.NETCore.App.Runtime.linux-arm64
>=11.0.0-preview.1, <11.0.0-rc.2
11.0.0-rc.2
nuget Microsoft.NETCore.App.Runtime.linux-musl-arm
>=11.0.0-preview.1, <11.0.0-rc.2
11.0.0-rc.2
nuget Microsoft.NETCore.App.Runtime.linux-musl-arm64
>=11.0.0-preview.1, <11.0.0-rc.2
11.0.0-rc.2
nuget Microsoft.NETCore.App.Runtime.linux-musl-x64
>=11.0.0-preview.1, <11.0.0-rc.2
11.0.0-rc.2
nuget Microsoft.NETCore.App.Runtime.linux-x64
>=11.0.0-preview.1, <11.0.0-rc.2
11.0.0-rc.2
nuget Microsoft.NETCore.App.Runtime.osx-arm64
>=11.0.0-preview.1, <11.0.0-rc.2
11.0.0-rc.2
nuget Microsoft.NETCore.App.Runtime.osx-x64
>=11.0.0-preview.1, <11.0.0-rc.2
11.0.0-rc.2

Affected products

  • Microsoft .NET 11.0 runtime
  • Microsoft Microsoft Visual Studio 2022 version 17.14
  • Microsoft Microsoft Visual Studio 2026 version 18.10

Classification

Weakness
  • CWE-295 Improper Certificate Validation

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.