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CVE-2026-42899VulnerabilityPublished Updated

Red Hat Security Advisory: .NET 10.0 security update

Affects Red Hat dotnet6Source GCVE Database

0
Authoritative record:CVE-2026-42899· High 7.5

Not known to be exploited · CVSS 7.5 High · fixed in Ubuntu package updates : patch the affected Ubuntu packages soon.

Data as of 26 Oct 2026, 12:55 UTC

CVSS 3.1 base score
7.5High
How severe the flaw is on the 0–10 CVSS scale.
EPSS
2.4% chance of exploitation in 30 days – higher than 84% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in 8.0.127-8.0.27-0ubuntu1~22.04.1, 10.0.108-10.0.8-0ubuntu1~24.04.1, 8.0.127-8.0.27-0ubuntu1~24.04.1 +5
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. Weaponised: 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 26 Oct 2026.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

ProductAffectedFixed in
Ubuntu 26.10dotnet10pkg:deb/ubuntu/dotnet10?arch=source&distro=stonkingOther threatsAffected
  • <10.0.108-10.0.8-0ubuntu1
Fixed in
  • 10.0.108-10.0.8-0ubuntu1
Ubuntu 26.04 LTSdotnet10pkg:deb/ubuntu/dotnet10?arch=source&distro=resoluteOther threatsAffected
  • <10.0.108-10.0.8-0ubuntu1~26.04.1
Fixed in
  • 10.0.108-10.0.8-0ubuntu1~26.04.1
Ubuntu 25.10dotnet10pkg:deb/ubuntu/dotnet10?arch=source&distro=questingOther threatsAffected
  • <10.0.108-10.0.8-0ubuntu1~25.10.1
Fixed in
  • 10.0.108-10.0.8-0ubuntu1~25.10.1
Ubuntu 25.10dotnet8pkg:deb/ubuntu/dotnet8?arch=source&distro=questingOther threatsAffected
  • <8.0.127-8.0.27-0ubuntu1~25.10.1
Fixed in
  • 8.0.127-8.0.27-0ubuntu1~25.10.1
Ubuntu 25.10dotnet9pkg:deb/ubuntu/dotnet9?arch=source&distro=questingOther threatsAffected
  • <9.0.117-9.0.16-0ubuntu1~25.10.1
Fixed in
  • 9.0.117-9.0.16-0ubuntu1~25.10.1
Ubuntu 24.04 LTSdotnet10pkg:deb/ubuntu/dotnet10?arch=source&distro=nobleOther threatsAffected
  • <10.0.108-10.0.8-0ubuntu1~24.04.1
Fixed in
  • 10.0.108-10.0.8-0ubuntu1~24.04.1

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

Description

.NET is a managed-software framework. It implements a subset of the .NET framework APIs and several new APIs, and it includes a CLR implementation. New versions of .NET that address a security vulnerability are now available. The updated versions are .NET SDK 10.0.108 and .NET Runtime 10.0.8.Security Fix(es): * dotnet: .NET: infinite loop allows an attacker to cause a denial of service (CVE-2026-42899) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

References

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