{"id":"CVE-2026-23666","aliases":["EUVD-2026-22363","GHSA-fvc9-q887-5p2h"],"status":"published","title":".NET Framework Denial of Service Vulnerability","description":"Improper input validation in .NET Framework allows an unauthorized attacker to deny service over a network.","severity":{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.0133,"percentile":0.71285,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-366","CWE-755"],"published":"2026-04-14T16:57:53Z","modified":"2026-10-26T21:10:00Z","products":[{"vendor":"microsoft","product":".net_framework"},{"vendor":"microsoft","product":"microsoft .net framework 3.5"},{"vendor":"microsoft","product":"microsoft .net framework 3.5 and 4.7.2"},{"vendor":"microsoft","product":"microsoft .net framework 3.5 and 4.8"},{"vendor":"microsoft","product":"microsoft .net framework 3.5 and 4.8.1"},{"vendor":"microsoft","product":"microsoft .net framework 4.6.2/4.7/4.7.1/4.7.2"},{"vendor":"microsoft","product":"microsoft .net framework 4.8"},{"vendor":"red hat","product":"red hat enterprise linux 10"},{"vendor":"red hat","product":"red hat enterprise linux 8"},{"vendor":"red hat","product":"red hat enterprise linux 9"},{"vendor":"red hat","product":"red hat hardened images"}],"references":[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-23666","tags":["vendor-advisory","patch","Vendor Advisory"]},{"url":"https://access.redhat.com/security/cve/CVE-2026-23666","tags":["vdb-entry","x_refsource_REDHAT"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2458271","tags":["issue-tracking","x_refsource_REDHAT"]},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-23666.json","tags":["x_sadp-csaf-vex"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-23666"},{"url":"https://github.com/advisories/GHSA-fvc9-q887-5p2h"}],"sources":{"cve":[{"id":"CVE-2026-23666","title":".NET Framework Denial of Service Vulnerability","description":"Improper input validation in .NET Framework allows an unauthorized attacker to deny service over a network.","status":"published","published":"2026-04-14T16:57:53.069Z","modified":"2026-10-15T15:53:06.154Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C","level":"high","assessor":"cna"},{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"adp"}],"cwes":["CWE-755","CWE-366"],"updated_at":"2026-11-02T13:42:04.39372Z"}],"euvd":[{"id":"EUVD-2026-22363","description":"Improper input validation in .NET Framework allows an unauthorized attacker to deny service over a network.","status":"published","published":"2026-04-14T16:57:53Z","modified":"2026-10-15T15:53:06Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C","level":"high"}],"updated_at":"2026-11-02T17:00:12.978606Z"}],"ghsa":[{"id":"GHSA-fvc9-q887-5p2h","title":"Concurrent execution using shared resource with improper synchronization ('race condition') in ...","description":"Concurrent execution using shared resource with improper synchronization ('race condition') in .NET Framework allows an unauthorized attacker to deny service over a network.","status":"published","published":"2026-04-14T18:30:37Z","modified":"2026-06-30T03:37:19Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"cwes":["CWE-366","CWE-755"],"updated_at":"2026-11-02T15:09:05.34707Z"}],"nvd":[{"id":"CVE-2026-23666","description":"Improper input validation in .NET Framework allows an unauthorized attacker to deny service over a network.","status":"published","published":"2026-04-14T18:16:44.507Z","modified":"2026-10-26T21:10:00.17Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"secondary"},{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"secondary"}],"cwes":["CWE-755","CWE-366"],"updated_at":"2026-11-02T14:12:14.748836Z"}]}}