{"schemaVersion":3,"id":"CVE-2026-40372","aliases":["UBUNTU-CVE-2026-40372","GHSA-9mv3-2cwr-p262","BIT-aspnet-core-2026-40372"],"status":"published","duplicateOf":null,"title":null,"description":"Improper verification of cryptographic signature in ASP.NET Core allows an unauthorized attacker to elevate privileges over a network.","dates":{"published":"2026-04-21T19:20:50.215Z","modified":"2026-10-15T15:53:48.048Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":9.1,"severity":"critical","version":"3.1","versionLabel":"v3.1","source":"CVE.org","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N/E:U/RL:O/RC:C","computed":false,"selection":"backend-summary"},"metrics":[{"version":"3.1","versionLabel":"v3.1","source":"CVE.org","score":9.1,"severity":"critical","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N/E:U/RL:O/RC:C","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"OSV · Ubuntu","score":9.1,"severity":"critical","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","exploitability":10,"impact":8.7,"computed":true},{"version":"3.1","versionLabel":"v3.1","source":"OSV · Nuget","score":9.1,"severity":"critical","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","exploitability":10,"impact":8.7,"computed":true},{"version":"3.1","versionLabel":"v3.1","source":"NVD","score":9.1,"severity":"critical","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","exploitability":null,"impact":null,"computed":false}]},"epss":{"probability":0.00824,"percentile":0.5665,"severity":"low","asOf":"2026-10-19T00:00:00.000Z","change":{"pp":-10.381,"baselineDate":"2026-09-19T00:00:00.000Z","baselineScore":0.11205},"history":[{"date":"2026-09-14T00:00:00.000Z","score":0.11205,"percentile":null},{"date":"2026-09-15T00:00:00.000Z","score":0.11205,"percentile":null},{"date":"2026-09-16T00:00:00.000Z","score":0.11205,"percentile":null},{"date":"2026-09-17T00:00:00.000Z","score":0.11205,"percentile":null},{"date":"2026-09-18T00:00:00.000Z","score":0.11205,"percentile":null},{"date":"2026-09-19T00:00:00.000Z","score":0.11205,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.11205,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.11205,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.11205,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.11205,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.00824,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.00824,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.00824,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.00824,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.00824,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.00824,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.00824,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.00824,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00824,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00824,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00824,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.00824,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.00824,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00824,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00824,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00824,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00824,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00824,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00824,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00824,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00824,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00824,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00824,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00824,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00824,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00824,"percentile":0.5665}],"last30":[{"date":"2026-09-19T00:00:00.000Z","score":0.11205,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.11205,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.11205,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.11205,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.11205,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.00824,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.00824,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.00824,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.00824,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.00824,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.00824,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.00824,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.00824,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00824,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00824,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00824,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.00824,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.00824,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00824,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00824,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00824,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00824,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00824,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00824,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00824,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00824,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00824,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00824,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00824,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00824,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00824,"percentile":0.5665}]},"kev":{"state":"not-listed","entries":[],"listedCount":0,"totalCatalogs":3,"catalogs":[{"source":"cisa","label":"CISA","listed":false,"entry":null},{"source":"enisa","label":"ENISA","listed":false,"entry":null},{"source":"circl","label":"CIRCL","listed":false,"entry":null}]},"ransomware":{"state":"none-recorded","sources":[]},"exploits":[],"exploitCount":0,"weaknesses":[{"id":"CWE-347","name":"Improper Verification of Cryptographic Signature","description":"The product does not verify, or incorrectly verifies, the cryptographic signature for data.","type":"weakness","status":"Draft","abstraction":"Base","likelihoodOfExploit":null,"url":"https://cwe.mitre.org/data/definitions/347.html"}],"affected":[{"vendor":"ubuntu","product":"dotnet10","name":"dotnet10","label":"dotnet10","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/dotnet10","purlType":"deb","versions":[{"text":"< 10.0.107-10.0.7-0ubuntu1~24.04.1","noFixRecorded":false,"fixedIn":null},{"text":"< 10.0.107-10.0.7-0ubuntu1~25.10.1","noFixRecorded":false,"fixedIn":null},{"text":"< 10.0.107-10.0.7-0ubuntu1~26.04.1","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 10.0.107-10.0.7-0ubuntu1~24.04.1 | < 10.0.107-10.0.7-0ubuntu1~25.10.1 | < 10.0.107-10.0.7-0ubuntu1~26.04.1","eol":null,"hubHref":null},{"vendor":"ubuntu","product":"dotnet7","name":"dotnet7","label":"dotnet7","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/dotnet7","purlType":"deb","versions":[{"text":"All versions","noFixRecorded":true,"fixedIn":null}],"versionsText":"All versions (No fix recorded)","eol":null,"hubHref":null},{"vendor":"microsoft","product":"asp.net_core","name":"asp.net core","label":"asp.net_core","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ 10.0.0, < 10.0.7","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 10.0.0, < 10.0.7","eol":null,"hubHref":"/vendor/microsoft/aspnet_core"},{"vendor":"microsoft","product":"asp.net core 10.0","name":"ASP.NET Core 10.0","label":"asp.net core 10.0","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ 10.0, < 10.0.7","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 10.0, < 10.0.7","eol":null,"hubHref":"/vendor/microsoft/aspnet_core_100"},{"vendor":"microsoft","product":"microsoft visual studio 2026 version 18.5","name":"Microsoft Visual Studio 2026 version 18.5","label":"microsoft visual studio 2026 version 18.5","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ 18.5.0, < 18.5.2","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 18.5.0, < 18.5.2","eol":null,"hubHref":"/vendor/microsoft/microsoft_visual_studio_2026_version_185"},{"vendor":"NuGet","product":"Microsoft.AspNetCore.DataProtection","name":"Microsoft.AspNetCore.DataProtection","label":"Microsoft.AspNetCore.DataProtection","ecosystem":"NuGet","cpePart":null,"purl":"pkg:nuget/Microsoft.AspNetCore.DataProtection","purlType":"nuget","versions":[{"text":"≥ 10.0.0, < 10.0.7","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 10.0.0, < 10.0.7","eol":null,"hubHref":null}],"affectedCount":6,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40372","label":"msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40372","hostname":"msrc.microsoft.com","tags":["Vendor Advisory","Patch","REPORT","WEB"]},{"url":"https://access.redhat.com/security/cve/CVE-2026-40372","label":"access.redhat.com/security/cve/CVE-2026-40372","hostname":"access.redhat.com","tags":["VDB Entry","X Refsource REDHAT"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2460224","label":"bugzilla.redhat.com/show_bug.cgi?id=2460224","hostname":"bugzilla.redhat.com","tags":["Issue Tracking","X Refsource REDHAT"]},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-40372.json","label":"security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-40372.json","hostname":"security.access.redhat.com","tags":["X Sadp Csaf Vex"]},{"url":"https://ubuntu.com/security/CVE-2026-40372","label":"ubuntu.com/security/CVE-2026-40372","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-40372","label":"www.cve.org/CVERecord?id=CVE-2026-40372","hostname":"www.cve.org","tags":["REPORT"]},{"url":"https://devblogs.microsoft.com/dotnet/dotnet-10-0-7-oob-security-update/","label":"devblogs.microsoft.com/dotnet/dotnet-10-0-7-oob-security-update/","hostname":"devblogs.microsoft.com","tags":["REPORT"]},{"url":"https://github.com/dotnet/announcements/issues/395","label":"github.com/dotnet/announcements/issues/395","hostname":"github.com","tags":["REPORT","WEB"]},{"url":"https://ubuntu.com/security/notices/USN-8215-1","label":"ubuntu.com/security/notices/USN-8215-1","hostname":"ubuntu.com","tags":["Advisory"]},{"url":"https://ubuntu.com/security/notices/USN-8216-1","label":"ubuntu.com/security/notices/USN-8216-1","hostname":"ubuntu.com","tags":["Advisory"]},{"url":"https://github.com/dotnet/aspnetcore/security/advisories/GHSA-9mv3-2cwr-p262","label":"github.com/dotnet/aspnetcore/security/advisories/GHSA-9mv3-2cwr-p262","hostname":"github.com","tags":["WEB"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-40372","label":"nvd.nist.gov/vuln/detail/CVE-2026-40372","hostname":"nvd.nist.gov","tags":["Advisory"]},{"url":"https://github.com/dotnet/aspnetcore","label":"github.com/dotnet/aspnetcore","hostname":"github.com","tags":["PACKAGE"]}],"lineage":{"upstream":[],"downstream":[],"duplicates":[],"related":["USN-8215-1","USN-8216-1"]},"timeline":[{"kind":"published","date":"2026-04-21T19:20:50.215Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2026-10-15T15:53:48.048Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":70,"level":"high","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-20T00:13:55.139Z","stale":false,"partial":false}}