{"id":"CVE-2026-118746","aliases":["EUVD-2026-122252","GHSA-ff4h-7rhj-jrjf","UBUNTU-CVE-2026-118746","USN-9042-1"],"status":"published","title":".NET Security Feature Bypass Vulnerability","description":"Not failing securely ('failing open') in .NET allows an unauthorized attacker to bypass a security feature over a network.","severity":{"version":"3.1","score":6.8,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N/E:U/RL:O/RC:C","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-14","score":0.00657,"percentile":0.5205,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-636"],"published":"2026-11-10T00:00:00Z","modified":"2026-11-12T17:29:39Z","fixes":[{"ecosystem":"NuGet","package":"Microsoft.NETCore.App.Runtime.linux-arm","fixed_in":["11.0.0-preview.7.26381.103","11.0.0"],"sources":["ghsa"]},{"ecosystem":"NuGet","package":"Microsoft.NETCore.App.Runtime.linux-arm64","fixed_in":["11.0.0-preview.7.26381.103","11.0.0"],"sources":["ghsa"]},{"ecosystem":"NuGet","package":"Microsoft.NETCore.App.Runtime.linux-musl-arm","fixed_in":["11.0.0-preview.7.26381.103","11.0.0"],"sources":["ghsa"]},{"ecosystem":"NuGet","package":"Microsoft.NETCore.App.Runtime.linux-musl-arm64","fixed_in":["11.0.0-preview.7.26381.103","11.0.0"],"sources":["ghsa"]},{"ecosystem":"NuGet","package":"Microsoft.NETCore.App.Runtime.linux-musl-x64","fixed_in":["11.0.0-preview.7.26381.103","11.0.0"],"sources":["ghsa"]},{"ecosystem":"NuGet","package":"Microsoft.NETCore.App.Runtime.linux-x64","fixed_in":["11.0.0-preview.7.26381.103","11.0.0"],"sources":["ghsa"]},{"ecosystem":"NuGet","package":"Microsoft.NETCore.App.Runtime.osx-arm64","fixed_in":["11.0.0-preview.7.26381.103"],"sources":["ghsa"]},{"ecosystem":"NuGet","package":"Microsoft.NETCore.App.Runtime.osx-x64","fixed_in":["11.0.0-preview.7.26381.103"],"sources":["ghsa"]},{"ecosystem":"Ubuntu:26.10","package":"dotnet11","fixed_in":["11.0.100-11.0.0-0ubuntu1~26.10.1"],"sources":["osv"]}],"affected":[{"source":"ghsa","ecosystem":"NuGet","package":"Microsoft.NETCore.App.Runtime.linux-arm","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"11.0.0-preview.1"},{"fixed":"11.0.0-preview.7.26381.103"}]}]},{"source":"ghsa","ecosystem":"NuGet","package":"Microsoft.NETCore.App.Runtime.linux-arm","ranges":[{"type":"UNPARSED","raw":"\u003e 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11.0.0","events":[{"fixed":"11.0.0"}]}]},{"source":"ghsa","ecosystem":"NuGet","package":"Microsoft.NETCore.App.Runtime.linux-musl-arm64","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"11.0.0-preview.1"},{"fixed":"11.0.0-preview.7.26381.103"}]}]},{"source":"ghsa","ecosystem":"NuGet","package":"Microsoft.NETCore.App.Runtime.linux-musl-arm64","ranges":[{"type":"UNPARSED","raw":"\u003e 11.0.0-preview.7.26381.103, \u003c 11.0.0","events":[{"fixed":"11.0.0"}]}]},{"source":"ghsa","ecosystem":"NuGet","package":"Microsoft.NETCore.App.Runtime.linux-musl-x64","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"11.0.0-preview.1"},{"fixed":"11.0.0-preview.7.26381.103"}]}]},{"source":"ghsa","ecosystem":"NuGet","package":"Microsoft.NETCore.App.Runtime.linux-musl-x64","ranges":[{"type":"UNPARSED","raw":"\u003e 11.0.0-preview.7.26381.103, \u003c 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11.0 installed on linux"},{"vendor":"microsoft","product":".net 11.0 installed on mac os"}],"references":[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-118746","tags":["vendor-advisory","patch","report"]},{"url":"https://github.com/dotnet/runtime/security/advisories/GHSA-ff4h-7rhj-jrjf","tags":["report"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-118746"},{"url":"https://github.com/dotnet/announcements/issues/498"},{"url":"https://github.com/dotnet/runtime/issues/137282"},{"url":"https://github.com/dotnet/core/blob/main/release-notes/11.0/11.0.0/11.0.0.md"},{"url":"https://github.com/dotnet/runtime/releases/tag/v11.0.0"},{"url":"https://github.com/advisories/GHSA-ff4h-7rhj-jrjf"},{"url":"https://ubuntu.com/security/CVE-2026-118746","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-118746","tags":["report"]},{"url":"https://devblogs.microsoft.com/dotnet/dotnet-and-dotnet-framework-november-2026-servicing-updates","tags":["report"]},{"url":"https://ubuntu.com/security/notices/USN-9042-1","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2026-105544","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2026-109475","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2026-109476","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2026-109478","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2026-109481","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2026-114146","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2026-114147","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2026-114149","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2026-114150","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2026-114155","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2026-114156","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2026-118748","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2026-118749","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2026-120796","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2026-118746","title":".NET Security Feature Bypass Vulnerability","description":"Not failing securely ('failing open') in .NET allows an unauthorized attacker to bypass a security feature over a network.","status":"published","published":"2026-11-10T18:21:51.731Z","modified":"2026-11-13T18:10:34.978Z","cvss":[{"version":"3.1","score":6.8,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N/E:U/RL:O/RC:C","level":"medium","assessor":"cna"}],"cwes":["CWE-636"],"updated_at":"2026-11-10T19:39:58.44836Z"}],"euvd":[{"id":"EUVD-2026-122252","description":"Not failing securely ('failing open') in .NET allows an unauthorized attacker to bypass a security feature over a network.","status":"published","published":"2026-11-10T18:21:51Z","modified":"2026-11-13T18:10:34Z","cvss":[{"version":"3.1","score":6.8,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N/E:U/RL:O/RC:C","level":"medium"}],"updated_at":"2026-11-10T19:22:08.52077Z"}],"ghsa":[{"id":"GHSA-ff4h-7rhj-jrjf","title":"Microsoft Security Advisory CVE-2026-118746 - .NET Security Feature Bypass Vulnerability","description":"## Executive summary\n\nMicrosoft is releasing this security advisory to provide information about a vulnerability in .NET. This advisory provides guidance on updating affected applications and components.\n\nUnix Negotiate authentication can accept a request when required channel-binding information is missing.\n\n## Announcement\n\nAnnouncement for this issue can be found at https://github.com/dotnet/announcements/issues/498\n\n## CVSS Details\n\n- **Version:** 3.1\n- **Severity:** Medium\n- **Score:** 6.8 (base score)\n- **Vector:** `CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N/E:U/RL:O/RC:C`\n- **Weakness:** CWE-636\n\n## Affected Platforms\n\n- **Platforms:** Linux, macOS\n- **Architectures:** Arm, Arm64, x64\n\n## \u003ca name=\"affected-packages\"\u003e\u003c/a\u003eAffected Packages\n\nThe tables list affected .NET 11 runtime package versions and fixed versions. The issue occurs during server-side Negotiate authentication with `PolicyEnforcement.Always` when the client omits the channel-binding token.\n\n### .NET 11.0 - Linux runtime packages\n\nPackage | Affected version | Patched version\n--- | --- | ---\n[Microsoft.NETCore.App.Runtime.linux-arm](https://www.nuget.org/packages/Microsoft.NETCore.App.Runtime.linux-arm) | \u003e= 11.0.0-preview.1, \u003c 11.0.0-preview.7.26381.103 | 11.0.0\n[Microsoft.NETCore.App.Runtime.linux-arm](https://www.nuget.org/packages/Microsoft.NETCore.App.Runtime.linux-arm) | \u003e 11.0.0-preview.7.26381.103, \u003c 11.0.0 | 11.0.0\n[Microsoft.NETCore.App.Runtime.linux-arm64](https://www.nuget.org/packages/Microsoft.NETCore.App.Runtime.linux-arm64) | \u003e= 11.0.0-preview.1, \u003c 11.0.0-preview.7.26381.103 | 11.0.0\n[Microsoft.NETCore.App.Runtime.linux-arm64](https://www.nuget.org/packages/Microsoft.NETCore.App.Runtime.linux-arm64) | \u003e 11.0.0-preview.7.26381.103, \u003c 11.0.0 | 11.0.0\n[Microsoft.NETCore.App.Runtime.linux-musl-arm](https://www.nuget.org/packages/Microsoft.NETCore.App.Runtime.linux-musl-arm) | \u003e= 11.0.0-preview.1, \u003c 11.0.0-preview.7.26381.103 | 11.0.0\n[Microsoft.NETCore.App.Runtime.linux-musl-arm](https://www.nuget.org/packages/Microsoft.NETCore.App.Runtime.linux-musl-arm) | \u003e 11.0.0-preview.7.26381.103, \u003c 11.0.0 | 11.0.0\n[Microsoft.NETCore.App.Runtime.linux-musl-arm64](https://www.nuget.org/packages/Microsoft.NETCore.App.Runtime.linux-musl-arm64) | \u003e= 11.0.0-preview.1, \u003c 11.0.0-preview.7.26381.103 | 11.0.0\n[Microsoft.NETCore.App.Runtime.linux-musl-arm64](https://www.nuget.org/packages/Microsoft.NETCore.App.Runtime.linux-musl-arm64) | \u003e 11.0.0-preview.7.26381.103, \u003c 11.0.0 | 11.0.0\n[Microsoft.NETCore.App.Runtime.linux-musl-x64](https://www.nuget.org/packages/Microsoft.NETCore.App.Runtime.linux-musl-x64) | \u003e= 11.0.0-preview.1, \u003c 11.0.0-preview.7.26381.103 | 11.0.0\n[Microsoft.NETCore.App.Runtime.linux-musl-x64](https://www.nuget.org/packages/Microsoft.NETCore.App.Runtime.linux-musl-x64) | \u003e 11.0.0-preview.7.26381.103, \u003c 11.0.0 | 11.0.0\n[Microsoft.NETCore.App.Runtime.linux-x64](https://www.nuget.org/packages/Microsoft.NETCore.App.Runtime.linux-x64) | \u003e= 11.0.0-preview.1, \u003c 11.0.0-preview.7.26381.103 | 11.0.0\n[Microsoft.NETCore.App.Runtime.linux-x64](https://www.nuget.org/packages/Microsoft.NETCore.App.Runtime.linux-x64) | \u003e 11.0.0-preview.7.26381.103, \u003c 11.0.0 | 11.0.0\n\nThe six Linux runtime packages at version 11.0.0-preview.7.26381.103 reject `PolicyEnforcement.Always` before authentication and are not affected.\n\n### .NET 11.0 - macOS runtime packages\n\nPackage | Affected version | Patched version\n--- | --- | ---\n[Microsoft.NETCore.App.Runtime.osx-arm64](https://www.nuget.org/packages/Microsoft.NETCore.App.Runtime.osx-arm64) | \u003e= 11.0.0-preview.1, \u003c 11.0.0-preview.7.26381.103 | 11.0.0\n[Microsoft.NETCore.App.Runtime.osx-x64](https://www.nuget.org/packages/Microsoft.NETCore.App.Runtime.osx-x64) | \u003e= 11.0.0-preview.1, \u003c 11.0.0-preview.7.26381.103 | 11.0.0\n\nThe macOS runtime packages at versions 11.0.0-preview.7.26381.103, 11.0.0-rc.1.26425.128, 11.0.0-rc.2.26504.105, and 11.0.0-rc.3.26522.148 reject `PolicyEnforcement.Always` before authentication and are not affected.\n\n## Advisory FAQ\n\n### \u003ca name=\"how-affected\"\u003e\u003c/a\u003eHow do I know if I am affected?\n\nApplications using server-side Negotiate authentication with `PolicyEnforcement.Always` are affected when their runtime package version is in the platform-specific ranges above. On Linux, this includes .NET 11 previews 1 through 6 and release candidates 1 through 3. On macOS, this includes .NET 11 previews 1 through 6. Preview 7 is not affected on either platform, and macOS release candidates 1 through 3 are not affected. Self-contained applications include their own runtime; updating a machine-wide runtime does not replace it.\n\n### \u003ca name=\"how-fix\"\u003e\u003c/a\u003eHow do I fix the issue?\n\nFor affected Linux and macOS .NET 11 prereleases, install .NET 11.0.0 or update each independently referenced runtime package to 11.0.0. Restart applications. Rebuild and redeploy self-contained applications; updating a machine-wide runtime does not replace their embedded runtime. An SDK update alone does not update an application's standalone package references.\n\nOn macOS, `PolicyEnforcement.Always` remains unsupported and throws `PlatformNotSupportedException`. The update prevents authentication from proceeding without the required protection; it does not add Extended Protection support on macOS.\n\n## Other Information\n\n### Reporting Security Issues\n\nIf you have found a potential security issue in a supported version of .NET, please report it to the Microsoft Security Response Center (MSRC) via the [MSRC Researcher Portal](https://msrc.microsoft.com/report/vulnerability/new). Further information can be found in the MSRC [Report an Issue FAQ](https://www.microsoft.com/msrc/faqs-report-an-issue).\n\nSecurity reports made through MSRC may qualify for the Microsoft .NET Bounty. Details of the Microsoft .NET Bounty Program including terms and conditions are at https://aka.ms/corebounty.\n\n### Support\n\nYou can ask questions about this issue on GitHub in the .NET GitHub organization. The main repos are located at https://github.com/dotnet/runtime. The Announcements repo (https://github.com/dotnet/Announcements) will contain this bulletin as an issue and will include a link to a discussion issue. You can ask questions in the linked discussion issue.\n\n### Disclaimer\n\nThe information provided in this advisory is provided \"as is\" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.\n\n### External Links\n\n[CVE-2026-118746](https://www.cve.org/CVERecord?id=CVE-2026-118746)\n\n### Acknowledgements\n\n- Alejandro Pacheco\n- Anonymous\n- Markus Magnuson\n\n### Revisions\n\nV1.0 (November 10, 2026): Advisory published.","status":"published","published":"2026-11-10T23:23:57Z","modified":"2026-11-10T23:23:58Z","cvss":[{"version":"3.1","score":5.9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N/E:U/RL:O/RC:C","level":"medium"}],"cwes":["CWE-636"],"updated_at":"2026-11-10T23:29:00.219125Z"}],"nvd":[{"id":"CVE-2026-118746","description":"Not failing securely ('failing open') in .NET allows an unauthorized attacker to bypass a security feature over a network.","status":"published","published":"2026-11-10T19:19:51.34Z","modified":"2026-11-10T20:18:25.753Z","cvss":[{"version":"3.1","score":6.8,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N","level":"medium","assessor":"secondary"}],"cwes":["CWE-636"],"updated_at":"2026-11-10T22:21:32.984056Z"}],"osv":[{"id":"UBUNTU-CVE-2026-118746","description":"Not failing securely ('failing open') in .NET allows an unauthorized attacker to bypass a security feature over a network.","status":"published","published":"2026-11-10T00:00:00Z","modified":"2026-11-12T17:25:21.332771715Z","cvss":[{"version":"3.1","score":6.8,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N","level":"medium"}],"updated_at":"2026-11-12T18:05:20.870791Z"},{"id":"USN-9042-1","title":"dotnet8, dotnet10, dotnet11 vulnerabilities","description":"Multiple security issues were discovered in .NET and this update includes\nnew upstream .NET versions to fix these issues.\n\n.NET 8 has been updated to 8.0.34 in Ubuntu 22.04 LTS and Ubuntu 24.04 LTS.\n.NET 10 has been updated to 10.0.15 in Ubuntu 24.04 LTS, Ubuntu 26.04 LTS\nand Ubuntu 26.10. .NET 11 has been updated to 11.0.0 in Ubuntu 26.10.\n\nIn addition to security fixes, the updated packages contain bug fixes, new\nfeatures, and possibly incompatible changes.","status":"published","published":"2026-11-11T16:53:48Z","modified":"2026-11-13T21:05:17.612549914Z","updated_at":"2026-11-12T18:08:46.665847Z"}]}}