{"id":"CVE-2026-21218","details":"Improper handling of missing special element in .NET allows an unauthorized attacker to perform spoofing over a network.","aliases":["BIT-dotnet-2026-21218","BIT-dotnet-sdk-2026-21218","GHSA-qvhc-9v3j-5rfw"],"modified":"2026-04-10T05:38:24.031483Z","published":"2026-02-10T18:16:22.967Z","related":["CGA-jmrr-7h6f-mqcx"],"references":[{"type":"ADVISORY","url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21218"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/dotnet/core","events":[{"introduced":"d78b3180414d35d6c7d136db753474e2ae2b33df"},{"fixed":"2d76eea456bdaf1092f06b3431f08b2dcfd2d1d6"},{"introduced":"e18becd6171b8eb0eb4ec7ea8a0280cacfcee36b"},{"fixed":"2d76eea456bdaf1092f06b3431f08b2dcfd2d1d6"},{"introduced":"0e06b3b745aaf3f2f96e5f163773d20f8c7f7f50"},{"fixed":"2d76eea456bdaf1092f06b3431f08b2dcfd2d1d6"}],"database_specific":{"versions":[{"introduced":"8.0.0"},{"fixed":"8.0.24"},{"introduced":"9.0.0"},{"fixed":"9.0.13"},{"introduced":"10.0.0"},{"fixed":"10.0.3"}]}}],"versions":["v10.0.0","v10.0.1","v10.0.2","v8.0.22","v8.0.23","v9.0.11","v9.0.12"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-21218.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N"}]}