Risk Scores
CVSS v3.1
9.100000381469727
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Ubuntu | .NET |
Timeline
- Apr 29, 2026 CVE Published
- Apr 29, 2026 Distribution Patch
=========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2026.4400 USN-8216-1: .NET vulnerabilities 29 April 2026 =========================================================================== AUSCERT Security Bulletin Summary --------------------------------- Product: .NET Publisher: Ubuntu Operating System: Ubuntu Resolution: Patch/Upgrade CVE Names: CVE-2026-26171 CVE-2026-32178 CVE-2026-32203 CVE-2026-33116 CVE-2026-40372 Original Bulletin: https://ubuntu.com/security/notices/USN-8216-1 Comment: CVSS (Max): 9.1 CVE-2026-40372 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N) CVSS Source: Ubuntu Calculator: https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N EPSS (Max): 0.8% (73rd) CVE-2026-33116 2026-04-28 - --------------------------BEGIN INCLUDED TEXT-------------------- USN-8216-1: .NET vulnerabilities Publication date 28 April 2026 Overview Several security issues were fixed in .NET. Releases 26.04 LTS --------------------------------------------------------------------------------- Open side navigation Packages o dotnet10 - .NET CLI tools and runtime Details Ludvig Pedersen discovered that the System.Security.Cryptography.Xml library in .NET incorrectly handled certain XML inputs. An attacker could possibly use this issue to consume excessive resources, resulting in a denial of service. ( CVE-2026-33116 , CVE-2026-26171 ) Ludvig Pedersen and Kevin Jones discovered that the System.Security.Cryptography.Xml library in .NET incorrectly handled certain XML inputs. An attacker could possibly use this issue to cause .NET to crash, resulting in a denial of service. ( CVE-2026-32203 ) Ludvig Pedersen discovered that the System.Net.Mail component in .NET incorrectly handled certain inputs. An attacker could possibly use this issue to perform a network spoofing attack. ( CVE-2026-32178 ) It was discovered that the Microsoft.AspNetCore.DataProtection library in .NET did not properly verify cryptographic signatures under certain conditions. A remote attacker could possibly use this issue to elevate privileges. ( CVE-2026-40372 ) --------------------------------------------------------------------------------- Update instructions The problem can be corrected by updating your system to the following package versions: Ubuntu Release Package Version aspnetcore-runtime-10.0 - 10.0.7-0ubuntu1~26.04.1 dotnet-host-10.0 - 10.0.7-0ubuntu1~26.04.1 dotnet-hostfxr-10.0 - 10.0.7-0ubuntu1~26.04.1 26.04 LTS resolute dotnet-runtime-10.0 - 10.0.7-0ubuntu1~26.04.1 dotnet-sdk-10.0 - 10.0.107-0ubuntu1~26.04.1 dotnet-sdk-aot-10.0 - 10.0.107-0ubuntu1~26.04.1 dotnet10 - 10.0.107-10.0.7-0ubuntu1~26.04.1 --------------------------------------------------------------------------------- References o CVE-2026-40372 o CVE-2026-33116 o CVE-2026-32203 o CVE-2026-32178 o CVE-2026-26171 Related notices o USN-8215-1 o USN-8176-1 - --------------------------END INCLUDED TEXT---------------------- You have received this e-mail bulletin as a result of your organisation's registration with AUSCERT. The mailing list you are subscribed to is maintained within your organisation, so if you do not wish to continue receiving these bulletins you should contact your local IT manager. If you do not know who that is, please send an email to auscert@auscert.org.au and we will forward your request to the appropriate person. NOTE: Third Party Rights This security bulletin is provided as a service to AUSCERT's members. As AUSCERT did not write the document quoted above, AUSCERT has had no control over its content. The decision to follow or act on information or advice contained in this security bulletin is the responsibility of each user or organisation, and should be considered in accordance with your organisation's site policies and procedures. AUSCERT takes no responsibility for consequences which may arise from following or acting on information or advice contained in this security bulletin. NOTE: This is only the original release of the security bulletin. It may not be updated when updates to the original are made. If downloading at a later date, it is recommended that the bulletin is retrieved directly from the author's website to ensure that the information is still current. Contact information for the authors of the original document is included in the Security Bulletin above. If you have any questions or need further information, please contact them directly. Previous advisories and external security bulletins can be retrieved from: https://portal.auscert.org.au/bulletins/ =========================================================================== AUSCERT The University of Queensland, Brisbane QLD 4072 Australia e: auscert@auscert.org.au t: +61 (0)7 3365 4417 Allies in Cyber Security ===========================================================================
| Vendor | Product | Versions |
|---|---|---|
| Ubuntu | .NET |