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Microsoft Security Advisory CVE-2026-21218 | .NET Security Feature Bypass Vulnerability
Microsoft Security Advisory CVE-2026-21218 | .NET Security Feature Bypass Vulnerability
Affected packages
- System.Security.Cryptography.Cose— 8.0.0 → 8.0.2
Exploit signal
- Known exploited (CISA KEV)
- No
- EPSS score
- —
- EPSS percentile
- —
EPSS is the probability a CVE is exploited in the wild; percentile is its rank among all CVEs.
Sources
- https://github.com/dotnet/runtime/security/advisories/GHSA-qvhc-9v3j-5rfw
- https://nvd.nist.gov/vuln/detail/CVE-2026-21218
- https://github.com/dotnet/runtime
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21218
Structured record: https://osv.dev/vulnerability/GHSA-qvhc-9v3j-5rfw
Recommended response stack
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