CVE-2026-21218
.NET Spoofing Vulnerability
7.5
HIGH
CVSS 3.1
EPSS 0.04%
Description
Improper handling of missing special element in .NET allows an unauthorized attacker to perform spoofing over a network.
How to fix CVE-2026-21218
To remediate CVE-2026-21218, upgrade the affected package to a fixed version below.
- Bitnami/dotnet—upgrade to 8.0.24 or later
- Bitnami/dotnet-sdk—upgrade to 8.0.24 or later
- —upgrade to 8.0.2 or later
Is CVE-2026-21218 being exploited?
Low — EPSS is 0.0%, meaning exploitation activity has not been observed at scale.
Affected packages (3)
- >= 8.0.0, < 8.0.24, >= 9.0.0, < 9.0.13, >= 10.0.0, < 10.0.3
- >= 8.0.0, < 8.0.24, >= 9.0.0, < 9.0.13, >= 10.0.0, < 10.0.3
- >= 8.0.0, < 8.0.2
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 4.0 | — | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N |
| osv | CVSS 3.1 | HIGH7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N |