CVE-2026-21218
HIGH.NET 8.0.0-8.0.23, 9.0.0-9.0.12, 10.0.0-10.0.2 - Spoofing via Missing Special Element Handling
Title source: llmDescription
Improper handling of missing special element in .NET allows an unauthorized attacker to perform spoofing over a network.
References (1)
Core 1
Core References
Vendor Advisory vendor-advisory
patch
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21218
Scores
CVSS v3
7.5
EPSS
0.0004
EPSS Percentile
13.9%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
yes
Technical Impact
partial
Details
CWE
CWE-166
Status
published
Products (5)
microsoft/.net
8.0.0 - 8.0.24
Microsoft/.NET 10.0
10.0.0 - 10.0.3
Microsoft/.NET 8.0
8.0.0 - 8.0.24
Microsoft/.NET 9.0
9.0.0 - 9.0.13
nuget/System.Security.Cryptography.Cose
8.0.0 - 8.0.2NuGet
Published
Feb 10, 2026
Tracked Since
Feb 18, 2026