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CVE-2026-42899VulnerabilityPublished Updated

Red Hat Security Advisory: .NET 10.0 security update

Affects Red Hat .NET 10.0Source GCVE Database

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Authoritative record:CVE-2026-42899· High 7.5

Not known to be exploited · CVSS 7.5 High · fixed in Red Hat package updates : patch Red Hat microsoft.net soon.

Data as of 6 Nov 2026, 02:06 UTC

CVSS 3.1 base score
7.5High
How severe the flaw is on the 0–10 CVSS scale.
Patch
Available – fixed in 10.0.8, 8.0.27, 9.0.16
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 12 May 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 5 Nov 2026.

What to do

Upgrade .NET to 10.0.8 (10.0) or 8.0.27 (8.0) or 9.0.16 (9.0).

Affected software

ProductAffectedFixed in
Microsoft.NET 10.0Affected
  • >=10.0.0 <10.0.8
Fixed in
  • 10.0.8
Microsoft.NET 8.0Affected
  • >=8.0.0 <8.0.27
Fixed in
  • 8.0.27
Microsoft.NET 9.0Affected
  • >=9.0.0 <9.0.16
Fixed in
  • 9.0.16
NuGetmicrosoft.netpkg:nuget/microsoft.netOther threatsAffected
  • =10.0.0
Fixed in–

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

Apply the official Red Hat updates to upgrade to .NET SDK 10.0.108 and .NET Runtime 10.0.8 as provided in Red Hat Security Advisory RHSA-2026:22145. Instructions for applying the update are available at https://access.redhat.com/articles/11258. This update resolves the infinite loop vulnerability and mitigates the denial of service risk.

Description

.NET 10.0 on Red Hat Enterprise Linux contains a vulnerability (CVE-2026-42899) where an infinite loop can be triggered, allowing an attacker to cause a denial of service. Updated versions .NET SDK 10.0.108 and .NET Runtime 10.0.8 address this issue. The vulnerability is rated as important by Red Hat Product Security. The issue affects multiple Red Hat Enterprise Linux 10 variants and related builder products. No CVSS score is provided, but the impact is denial of service.

References

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