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Advisory severityMedium6.5Red Hat Linux

Medium [CVE-2026-50659] .NET:.NET: Network Spoofing Vulnerability

This medium-severity Red Hat Linux advisory covers CVE-2026-50659 affecting Red Hat Enterprise Linux 10.0 Extended Update Support, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions.

Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.

CVE-2026-50659 Source published Source updated

VulniPulse record published Record updated

CVE-2026-50659
Affected products & platforms
Red Hat LinuxRed Hat Enterprise Linux
Open source advisory

Summary

Improper encoding or escaping of output in.NET allows an authorized attacker to perform spoofing over a network. A flaw was found in.NET.

This allows the attacker to perform spoofing over a network, potentially deceiving users or systems into believing they are interacting with a trusted entity.

The vulnerability affects integrity only and has no impact on confidentiality or availability (Red Hat CVSS 3.1 score 6.5, vector AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N), which matches the upstream severity assessment.

The flaw affects the.NET 8.0, 9.0, and 10.0 release lines; streams shipping.NET outside these lines, such as the RHEL BR dotnet6.0 stream, and the OpenShift Dev Spaces UDI container image are marked not affected.

This issue is handled as delegated: a fix is being pursued through the upstream.NET updates, and several affected Red Hat streams have already shipped the corrected packages. Weakness: CWE-838.

Affected Red Hat products: Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 10.0 Extended Update Support; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9; Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions; Red Hat Enterprise Linux 9.6 Extended Update Support; Red Hat Hardened Images.

Red Hat lists Red Hat OpenShift Dev Spaces as not affected.

Is CVE-2026-50659 exploited?

No exploitation is reported in the sources VulniPulse tracks: CVE-2026-50659 is not in the CISA KEV catalog (checked ) and this advisory does not report exploitation. That is not proof the vulnerability cannot be exploited.

How do I fix CVE-2026-50659?

Upgrade to a fixed release named by Red Hat:

  • dotnet8.0-0:8.0.129-1.el10_2
  • dotnet9.0-0:9.0.119-1.el10_2
  • dotnet10.0-0:10.0.110-1.el10_2
  • dotnet8.0-0:8.0.130-1.el10_0
  • dotnet9.0-0:9.0.120-1.el10_0
  • dotnet9.0-0:9.0.119-1.el8_10
  • dotnet10.0-0:10.0.110-1.el8_10
  • dotnet8.0-0:8.0.129-1.el8_10
  • dotnet8.0-0:8.0.129-1.el9_8
  • dotnet9.0-0:9.0.119-1.el9_8
  • dotnet10.0-0:10.0.110-1.el9_8
  • dotnet8.0-0:8.0.130-1.el9_4

22 more fixed releases are listed below.

Confirm against the vendor advisory before you patch.

Affected versions

No affected-version range was extracted from the source record. The vendor advisory is authoritative. Check it before change work.

Official advisory · high-confidence parse· fetched 6 days ago·verify at source

Fixed versions
  • dotnet8.0-0:8.0.129-1.el10_2
  • dotnet9.0-0:9.0.119-1.el10_2
  • dotnet10.0-0:10.0.110-1.el10_2
  • dotnet8.0-0:8.0.130-1.el10_0
  • dotnet9.0-0:9.0.120-1.el10_0
  • dotnet9.0-0:9.0.119-1.el8_10
  • dotnet10.0-0:10.0.110-1.el8_10
  • dotnet8.0-0:8.0.129-1.el8_10
  • dotnet8.0-0:8.0.129-1.el9_8
  • dotnet9.0-0:9.0.119-1.el9_8
  • dotnet10.0-0:10.0.110-1.el9_8
  • dotnet8.0-0:8.0.130-1.el9_4
  • dotnet8.0-0:8.0.130-1.el9_6
  • dotnet9.0-0:9.0.120-1.el9_6
  • dotnet10-0-main-10.0.109-1.hum1
  • dotnet9-0-main-9.0.119-1.hum1
  • dotnet8-0-main-8.0.129-2.1.hum1
  • RHSA-2026:41893
  • RHSA-2026:41895
  • RHSA-2026:41897
  • RHSA-2026:58566
  • RHSA-2026:58567
  • RHSA-2026:41899
  • RHSA-2026:41900
  • RHSA-2026:41901
  • RHSA-2026:41894
  • RHSA-2026:41896
  • RHSA-2026:41898
  • RHSA-2026:58568
  • RHSA-2026:58569
  • RHSA-2026:58570
  • RHSA-2026:26638
  • RHSA-2026:39952
  • RHSA-2026:42145

Official advisory · high-confidence parse· fetched 6 days ago·verify at source

Mitigation checklist

Recommended fix / mitigation
  • Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.

Official advisory · high-confidence parse· fetched 6 days ago·verify at source

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