{"id":"CVE-2026-42899","published":"2026-05-12T16:59:06Z","modified":"2026-08-10T15:13:16Z","title":"ASP.NET Core Denial of Service Vulnerability","vendor":"Microsoft","product":".NET 10.0","tier":"tail","description":{"text":"Loop with unreachable exit condition ('infinite loop') in ASP.NET Core allows an unauthorized attacker to deny service over a network.","provenance":"source","from":"CVE.org"},"cvss":{"score":7.5,"severity":"HIGH","version":"3.1","vector":"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","provenance":"source","from":"CVE.org CNA"},"epss":{"score":0.0243,"percentile":0.84179,"provenance":"source"},"cwes":[{"id":"CWE-835","name":"Loop with Unreachable Exit Condition"}],"references":[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-42899","tags":["vendor-advisory","patch"]},{"url":"https://access.redhat.com/security/cve/CVE-2026-42899","tags":["vdb-entry","x_refsource_REDHAT"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2476605","tags":["issue-tracking","x_refsource_REDHAT"]},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-42899.json","tags":["x_sadp-csaf-vex"]},{"url":"https://access.redhat.com/errata/RHSA-2026:24332","tags":["vendor-advisory","x_refsource_REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2026:24333","tags":["vendor-advisory","x_refsource_REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2026:22145","tags":["vendor-advisory","x_refsource_REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2026:21286","tags":["vendor-advisory","x_refsource_REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2026:21754","tags":["vendor-advisory","x_refsource_REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2026:21295","tags":["vendor-advisory","x_refsource_REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2026:21291","tags":["vendor-advisory","x_refsource_REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2026:21294","tags":["vendor-advisory","x_refsource_REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2026:24334","tags":["vendor-advisory","x_refsource_REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2026:24335","tags":["vendor-advisory","x_refsource_REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2026:24336","tags":["vendor-advisory","x_refsource_REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2026:21297","tags":["vendor-advisory","x_refsource_REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2026:21293","tags":["vendor-advisory","x_refsource_REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2026:21296","tags":["vendor-advisory","x_refsource_REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2026:17464","tags":["vendor-advisory","x_refsource_REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2026:17682","tags":["vendor-advisory","x_refsource_REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2026:17527","tags":["vendor-advisory","x_refsource_REDHAT"]}],"priority":{"score":22.1,"factors":[{"name":"EPSS percentile","points":16.84},{"name":"CVSS severity","points":5.25}]},"vendorSlug":"microsoft","affectedVersions":[{"vendor":"Microsoft","product":".NET 10.0","versions":[">= 10.0.0, < 10.0.8"]},{"vendor":"Microsoft","product":".NET 8.0","versions":[">= 8.0.0, < 8.0.27"]},{"vendor":"Microsoft","product":".NET 9.0","versions":[">= 9.0.0, < 9.0.16"]}],"affected":[{"ecosystem":"NuGet","package":"Microsoft.AspNetCore.App.Runtime.win-arm","vulnerableRanges":[">=8.0.0, <8.0.27",">=9.0.0, <9.0.16",">=10.0.0, <10.0.8"],"patched":["8.0.27","9.0.16","10.0.8"],"from":["GHSA-9v76-4qcc-frgh"],"provenance":"source"},{"ecosystem":"NuGet","package":"Microsoft.AspNetCore.App.Runtime.win-arm64","vulnerableRanges":[">=8.0.0, <8.0.27",">=9.0.0, <9.0.16",">=10.0.0, <10.0.8"],"patched":["8.0.27","9.0.16","10.0.8"],"from":["GHSA-9v76-4qcc-frgh"],"provenance":"source"},{"ecosystem":"NuGet","package":"Microsoft.AspNetCore.App.Runtime.win-x64","vulnerableRanges":[">=8.0.0, <8.0.27",">=9.0.0, <9.0.16",">=10.0.0, <10.0.8"],"patched":["8.0.27","9.0.16","10.0.8"],"from":["GHSA-9v76-4qcc-frgh"],"provenance":"source"},{"ecosystem":"NuGet","package":"Microsoft.AspNetCore.App.Runtime.win-x86","vulnerableRanges":[">=8.0.0, <8.0.27",">=9.0.0, <9.0.16",">=10.0.0, <10.0.8"],"patched":["8.0.27","9.0.16","10.0.8"],"from":["GHSA-9v76-4qcc-frgh"],"provenance":"source"},{"ecosystem":"NuGet","package":"Microsoft.AspNetCore.App.Runtime.linux-arm","vulnerableRanges":[">=8.0.0, <8.0.27",">=9.0.0, <9.0.16",">=10.0.0, <10.0.8"],"patched":["8.0.27","9.0.16","10.0.8"],"from":["GHSA-9v76-4qcc-frgh"],"provenance":"source"},{"ecosystem":"NuGet","package":"Microsoft.AspNetCore.App.Runtime.linux-arm64","vulnerableRanges":[">=8.0.0, <8.0.27",">=9.0.0, <9.0.16",">=10.0.0, <10.0.8"],"patched":["8.0.27","9.0.16","10.0.8"],"from":["GHSA-9v76-4qcc-frgh"],"provenance":"source"},{"ecosystem":"NuGet","package":"Microsoft.AspNetCore.App.Runtime.linux-musl-arm","vulnerableRanges":[">=8.0.0, <8.0.27",">=9.0.0, <9.0.16",">=10.0.0, <10.0.8"],"patched":["8.0.27","9.0.16","10.0.8"],"from":["GHSA-9v76-4qcc-frgh"],"provenance":"source"},{"ecosystem":"NuGet","package":"Microsoft.AspNetCore.App.Runtime.linux-musl-arm64","vulnerableRanges":[">=8.0.0, <8.0.27",">=9.0.0, <9.0.16",">=10.0.0, <10.0.8"],"patched":["8.0.27","9.0.16","10.0.8"],"from":["GHSA-9v76-4qcc-frgh"],"provenance":"source"},{"ecosystem":"NuGet","package":"Microsoft.AspNetCore.App.Runtime.linux-musl-x64","vulnerableRanges":[">=8.0.0, <8.0.27",">=10.0.0, <10.0.8",">=9.0.0, <9.0.16"],"patched":["8.0.27","10.0.8","9.0.16"],"from":["GHSA-9v76-4qcc-frgh"],"provenance":"source"},{"ecosystem":"NuGet","package":"Microsoft.AspNetCore.App.Runtime.linux-x64","vulnerableRanges":[">=8.0.0, <8.0.27",">=9.0.0, <9.0.16",">=10.0.0, <10.0.8"],"patched":["8.0.27","9.0.16","10.0.8"],"from":["GHSA-9v76-4qcc-frgh"],"provenance":"source"}],"euvd":{"id":"EUVD-2026-29719","exploited":false,"provenance":"source"},"lineage":{"packageHistory":[{"cve":"CVE-2025-55315","published":"2025-10-14","fixed":"10.0.0-rc.2.25502.107","kev":false,"link":{"from":"CVE-2025-55315","to":"CVE-2026-42899","relation":"successor","confidence":"low","kind":"sequence","evidence":[{"kind":"version-step","provenance":"source","package":"NuGet:Microsoft.AspNetCore.App.Runtime.win-x64","fromFixed":"8.0.21","toFixed":"8.0.27","daysApart":210},{"kind":"version-step","provenance":"source","package":"NuGet:Microsoft.AspNetCore.App.Runtime.win-x64","fromFixed":"9.0.10","toFixed":"9.0.16","daysApart":210}]}},{"cve":"CVE-2026-26130","published":"2026-03-10","fixed":"10.0.4","kev":false},{"cve":"CVE-2026-56170","published":"2026-07-14","fixed":"10.0.6","kev":false},{"cve":"CVE-2026-42899","published":"2026-05-12","fixed":"10.0.8","kev":false},{"cve":"CVE-2026-45591","published":"2026-06-09","fixed":"10.0.9","kev":false,"link":{"from":"CVE-2026-42899","to":"CVE-2026-45591","relation":"successor","confidence":"medium","kind":"sequence","evidence":[{"kind":"version-step","provenance":"source","package":"NuGet:Microsoft.AspNetCore.App.Runtime.linux-x64","fromFixed":"8.0.27","toFixed":"8.0.28","daysApart":28},{"kind":"version-step","provenance":"source","package":"NuGet:Microsoft.AspNetCore.App.Runtime.linux-x64","fromFixed":"10.0.8","toFixed":"10.0.9","daysApart":28},{"kind":"similar","provenance":"machine","score":0.44,"basis":"same product + description similarity"}]}},{"cve":"CVE-2026-70175","published":"2026-10-13","fixed":"10.0.13","kev":false},{"cve":"CVE-2026-70181","published":"2026-10-13","fixed":"10.0.13","kev":false},{"cve":"CVE-2026-70188","published":"2026-10-13","fixed":"11.0.0-rc.2","kev":false,"link":{"from":"CVE-2026-42899","to":"CVE-2026-70188","relation":"successor","confidence":"low","kind":"sequence","evidence":[{"kind":"version-step","provenance":"source","package":"NuGet:Microsoft.AspNetCore.App.Runtime.win-x86","fromFixed":"8.0.27","toFixed":"8.0.32","daysApart":154},{"kind":"version-step","provenance":"source","package":"NuGet:Microsoft.AspNetCore.App.Runtime.win-x86","fromFixed":"10.0.8","toFixed":"10.0.13","daysApart":154}]}},{"cve":"CVE-2026-88092","published":"2026-10-13","fixed":"11.0.0-rc.2","kev":false,"link":{"from":"CVE-2026-42899","to":"CVE-2026-88092","relation":"successor","confidence":"low","kind":"sequence","evidence":[{"kind":"version-step","provenance":"source","package":"NuGet:Microsoft.AspNetCore.App.Runtime.win-x86","fromFixed":"8.0.27","toFixed":"8.0.32","daysApart":154},{"kind":"version-step","provenance":"source","package":"NuGet:Microsoft.AspNetCore.App.Runtime.win-x86","fromFixed":"10.0.8","toFixed":"10.0.13","daysApart":154}]}}],"package":"NuGet:Microsoft.AspNetCore.App.Runtime.linux-x64"}}