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[USN-8216-1] .NET vulnerabilities

Posted on 29 April 2026
Ubuntu Security

==========================================================================Ubuntu Security Notice USN-8216-1
April 28, 2026

dotnet10 vulnerabilities
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:


Summary:

Several security issues were fixed in .NET.

Software Description:

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:

After a standard system update, it is recommended to rotate the
DataProtection key ring.

References:
https://ubuntu.com/security/notices/USN-8216-1
CVE-2026-26171, CVE-2026-32178, CVE-2026-32203, CVE-2026-33116,
CVE-2026-40372

--===============6757512660038844676==Content-Type: application/pgp-signature; name="signature.asc"
Content-Description: OpenPGP digital signature

 

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