{"id":"CVE-2026-45591","title":"ASP.NET Core Denial of Service Vulnerability","summary":"Uncontrolled resource consumption in ASP.NET Core allows an unauthorized attacker to deny service over a network.","severity":"high","cvss":7.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C","cvssSource":"cna","cwe":["CWE-400","CWE-787"],"vendor":"Microsoft","product":".NET 10.0","affected":[".net_10.0 >= 10.0.0 < 10.0.9",".net_8.0 >= 8.0.0 < 8.0.28",".net_9.0 >= 9.0.0 < 9.0.17","asp.net_core_10.0 >= 10.0 < 10.0.9","asp.net_core_8.0 >= 8.0 < 8.0.28","asp.net_core_9.0 >= 9.0 < 9.0.17","visual_studio_2026_version_18.6 >= 18.6.0 < 18.6.3"],"ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"partial","timestamp":"2026-06-10T13:47:51.768280Z"},"published":"2026-06-09","updated":"2026-09-24","sourceUpdated":"2026-09-24T13:44:25.445Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-45591","references":[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45591","label":"ASP.NET Core Denial of Service Vulnerability"},{"url":"https://github.com/dotnet/aspnetcore/security/advisories/GHSA-f8h2-vmm9-qhj6"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-45591"},{"url":"https://github.com/dotnet/announcements/issues/405"},{"url":"https://github.com/dotnet/aspnetcore/discussions/67100"},{"url":"https://github.com/advisories/GHSA-f8h2-vmm9-qhj6"}],"tags":["cve.org","ghsa","nuget"],"epss":0.02444,"epssPercentile":0.83631,"aliases":["GHSA-f8h2-vmm9-qhj6"],"ecosystem":"nuget","patched":["Microsoft.AspNetCore.App.Runtime.linux-x64 8.0.28","Microsoft.AspNetCore.App.Runtime.linux-x64 9.0.17","Microsoft.AspNetCore.App.Runtime.linux-x64 10.0.9","Microsoft.AspNetCore.App.Runtime.win-x64 8.0.28","Microsoft.AspNetCore.App.Runtime.win-x64 9.0.17","Microsoft.AspNetCore.App.Runtime.win-x64 10.0.9","Microsoft.AspNetCore.App.Runtime.osx-arm64 8.0.28","Microsoft.AspNetCore.App.Runtime.osx-arm64 9.0.17","Microsoft.AspNetCore.App.Runtime.osx-arm64 10.0.9","Microsoft.AspNetCore.SignalR.Protocols.MessagePack 8.0.28","Microsoft.AspNetCore.SignalR.Protocols.MessagePack 9.0.17","Microsoft.AspNetCore.SignalR.Protocols.MessagePack 10.0.9"],"ingestedAt":"2026-07-07T15:41:58.675Z","slug":"CVE-2026-45591","body":"## Overview\n\nUncontrolled resource consumption in ASP.NET Core allows an unauthorized attacker to deny service over a network.\n\n## Affected\n\n- `.net_10.0 >= 10.0.0 < 10.0.9`\n- `.net_8.0 >= 8.0.0 < 8.0.28`\n- `.net_9.0 >= 9.0.0 < 9.0.17`\n- `asp.net_core_10.0 >= 10.0 < 10.0.9`\n- `asp.net_core_8.0 >= 8.0 < 8.0.28`\n- `asp.net_core_9.0 >= 9.0 < 9.0.17`\n- `visual_studio_2026_version_18.6 >= 18.6.0 < 18.6.3`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Package advisory (CVE-2026-45591)\n\nAffected packages:\n\n- `Microsoft.AspNetCore.App.Runtime.linux-x64 >= 8.0.0, <= 8.0.27`\n- `Microsoft.AspNetCore.App.Runtime.linux-x64 >= 9.0.0, <= 9.0.16`\n- `Microsoft.AspNetCore.App.Runtime.linux-x64 >= 10.0.0, <= 10.0.8`\n- `Microsoft.AspNetCore.App.Runtime.win-x64 >= 8.0.0, <= 8.0.27`\n- `Microsoft.AspNetCore.App.Runtime.win-x64 >= 9.0.0, <= 9.0.16`\n- `Microsoft.AspNetCore.App.Runtime.win-x64 >= 10.0.0, <= 10.0.8`\n- `Microsoft.AspNetCore.App.Runtime.osx-arm64 >= 8.0.0, <= 8.0.27`\n- `Microsoft.AspNetCore.App.Runtime.osx-arm64 >= 9.0.0, <= 9.0.16`\n- `Microsoft.AspNetCore.App.Runtime.osx-arm64 >= 10.0.0, <= 10.0.8`\n- `Microsoft.AspNetCore.SignalR.Protocols.MessagePack >= 8.0.0, <= 8.0.27`\n- `Microsoft.AspNetCore.SignalR.Protocols.MessagePack >= 9.0.0, <= 9.0.16`\n- `Microsoft.AspNetCore.SignalR.Protocols.MessagePack >= 10.0.0, <= 10.0.8`\n\nPatched in:\n\n- `Microsoft.AspNetCore.App.Runtime.linux-x64 8.0.28`\n- `Microsoft.AspNetCore.App.Runtime.linux-x64 9.0.17`\n- `Microsoft.AspNetCore.App.Runtime.linux-x64 10.0.9`\n- `Microsoft.AspNetCore.App.Runtime.win-x64 8.0.28`\n- `Microsoft.AspNetCore.App.Runtime.win-x64 9.0.17`\n- `Microsoft.AspNetCore.App.Runtime.win-x64 10.0.9`\n- `Microsoft.AspNetCore.App.Runtime.osx-arm64 8.0.28`\n- `Microsoft.AspNetCore.App.Runtime.osx-arm64 9.0.17`\n- `Microsoft.AspNetCore.App.Runtime.osx-arm64 10.0.9`\n- `Microsoft.AspNetCore.SignalR.Protocols.MessagePack 8.0.28`\n- `Microsoft.AspNetCore.SignalR.Protocols.MessagePack 9.0.17`\n- `Microsoft.AspNetCore.SignalR.Protocols.MessagePack 10.0.9`\n\nSource: https://github.com/advisories/GHSA-f8h2-vmm9-qhj6","depth":"twilight","depthScore":42,"depthScoreParts":{"impact":41.3,"likelihood":0.5,"exploitation":0,"ransomware":0},"changes":[]}