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Microsoft Security Advisory CVE-2026-21218 | .NET Security Feature Bypass Vulnerability

🗓️ 10 Feb 2026 21:32:18Reported by GitHub Advisory DatabaseType 
github
 github
🔗 github.com👁 37 Views

Security advisory for dotnet 8-10 reveals a cose bypass vulnerability; apply patches.

Related
Detection
Refs
ReporterTitlePublishedViews
Family
alpinelinux
AlpineLinux
CVE-2026-21218
10 Feb 202617:51
–alpinelinux
bdu_fstec
BDU FSTEC
.NET Spoofing
13 Feb 202600:00
–bdu_fstec
cgr
Chainguard
CVE-2026-21218 vulnerabilities
23 Feb 202619:17
–cgr
circl
Circl
CVE-2026-21218
10 Feb 202617:30
–circl
cnnvd
CNNVD
Microsoft .NET security vulnerabilities
10 Feb 202600:00
–cnnvd
cve
CVE
CVE-2026-21218
10 Feb 202617:51
–cve
cvelist
Cvelist
CVE-2026-21218 .NET Spoofing Vulnerability
10 Feb 202617:51
–cvelist
mskb
Microsoft KB
.NET 10.0 Update - February 10, 2026
10 Feb 202616:00
–mskb
mskb
Microsoft KB
.NET 8.0 Update - February 10, 2026
10 Feb 202616:00
–mskb
mskb
Microsoft KB
.NET 9.0 Update - February 10, 2026
10 Feb 202616:00
–mskb
Rows per page
Vulners
Node
OR
system.security.cryptography.coseRange10.0.0–10.0.2nuget
system.security.cryptography.coseRange9.0.0–9.0.12nuget
system.security.cryptography.coseRange8.0.0–8.0.1nuget

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13 Feb 2026 19:43Current
7.1High risk
Vulners AI Score7.1
CVSS 3.17.5
EPSS0.01012
SSVC
37