{"id":"CVE-2026-118746","kind":"vulnerability","aliases":["CVE-2026-118746","GHSA-ff4h-7rhj-jrjf"],"related":[],"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## <a name=\"affected-packages\"></a>Affected 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) | >= 11.0.0-preview.1, < 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) | > 11.0.0-preview.7.26381.103, < 11.0.0 | 11.0.0\n[Microsoft.NETCore.App.Runtime.linux-arm64](https://www.nuget.org/packages/Microsoft.NETCore.App.Runtime.linux-arm64) | >= 11.0.0-preview.1, < 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) | > 11.0.0-preview.7.26381.103, < 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) | >= 11.0.0-preview.1, < 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) | > 11.0.0-preview.7.26381.103, < 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) | >= 11.0.0-preview.1, < 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) | > 11.0.0-preview.7.26381.103, < 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) | >= 11.0.0-preview.1, < 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) | > 11.0.0-preview.7.26381.103, < 11.0.0 | 11.0.0\n[Microsoft.NETCore.App.Runtime.linux-x64](https://www.nuget.org/packages/Microsoft.NETCore.App.Runtime.linux-x64) | >= 11.0.0-preview.1, < 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) | > 11.0.0-preview.7.26381.103, < 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) | >= 11.0.0-preview.1, < 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) | >= 11.0.0-preview.1, < 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### <a name=\"how-affected\"></a>How 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### <a name=\"how-fix\"></a>How 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.","summary":"On Linux and macOS, .NET 11 prerelease runtimes accept a server-side Negotiate authentication request when the client omits required channel-binding information, even with PolicyEnforcement.Always set. An attacker who can reach the service may get past this protection check.","severity":"medium","cvss":6.8,"epss":null,"exploited":false,"exploited_at":null,"products":[{"name":".NET","fixed":[],"affected":"","ecosystem":"runtime"},{"name":"Microsoft.NETCore.App.Runtime.linux-arm","fixed":["11.0.0"],"affected":">= 11.0.0-preview.1, < 11.0.0-preview.7.26381.103","ecosystem":"nuget"},{"name":"Microsoft.NETCore.App.Runtime.linux-arm","fixed":["11.0.0"],"affected":"> 11.0.0-preview.7.26381.103, < 11.0.0","ecosystem":"nuget"},{"name":"Microsoft.NETCore.App.Runtime.linux-arm64","fixed":["11.0.0"],"affected":">= 11.0.0-preview.1, < 11.0.0-preview.7.26381.103","ecosystem":"nuget"},{"name":"Microsoft.NETCore.App.Runtime.linux-arm64","fixed":["11.0.0"],"affected":"> 11.0.0-preview.7.26381.103, < 11.0.0","ecosystem":"nuget"},{"name":"Microsoft.NETCore.App.Runtime.linux-musl-arm","fixed":["11.0.0"],"affected":">= 11.0.0-preview.1, < 11.0.0-preview.7.26381.103","ecosystem":"nuget"},{"name":"Microsoft.NETCore.App.Runtime.linux-musl-arm","fixed":["11.0.0"],"affected":"> 11.0.0-preview.7.26381.103, < 11.0.0","ecosystem":"nuget"},{"name":"Microsoft.NETCore.App.Runtime.linux-musl-arm64","fixed":["11.0.0"],"affected":">= 11.0.0-preview.1, < 11.0.0-preview.7.26381.103","ecosystem":"nuget"},{"name":"Microsoft.NETCore.App.Runtime.linux-musl-arm64","fixed":["11.0.0"],"affected":"> 11.0.0-preview.7.26381.103, < 11.0.0","ecosystem":"nuget"},{"name":"Microsoft.NETCore.App.Runtime.linux-musl-x64","fixed":["11.0.0"],"affected":">= 11.0.0-preview.1, < 11.0.0-preview.7.26381.103","ecosystem":"nuget"},{"name":"Microsoft.NETCore.App.Runtime.linux-musl-x64","fixed":["11.0.0"],"affected":"> 11.0.0-preview.7.26381.103, < 11.0.0","ecosystem":"nuget"},{"name":"Microsoft.NETCore.App.Runtime.linux-x64","fixed":["11.0.0"],"affected":">= 11.0.0-preview.1, < 11.0.0-preview.7.26381.103","ecosystem":"nuget"},{"name":"Microsoft.NETCore.App.Runtime.linux-x64","fixed":["11.0.0"],"affected":"> 11.0.0-preview.7.26381.103, < 11.0.0","ecosystem":"nuget"},{"name":"Microsoft.NETCore.App.Runtime.osx-arm64","fixed":["11.0.0"],"affected":">= 11.0.0-preview.1, < 11.0.0-preview.7.26381.103","ecosystem":"nuget"},{"name":"Microsoft.NETCore.App.Runtime.osx-x64","fixed":["11.0.0"],"affected":">= 11.0.0-preview.1, < 11.0.0-preview.7.26381.103","ecosystem":"nuget"}],"ecosystems":["nuget","runtime"],"tags":["cwe-636","dotnet","linux","macos","negotiate-auth","runtime","self-hosted"],"not_affected_if":["macos-rc-1-to-3","no-negotiate-auth","preview-7-or-later","windows-only"],"how_to_check":"- Check the runtime version in use with `dotnet --list-runtimes` or the referenced `Microsoft.NETCore.App.Runtime` package version in the project file.\n- Look for server-side Negotiate authentication with `PolicyEnforcement.Always` in the application code or configuration.\n- Self-contained applications carry their own runtime, so check the version each one was published with.","fix":"- Move affected .NET 11 prerelease packages to `11.0.0` or later, per the advisory's Linux and macOS package tables.\n- Rebuild and redeploy self-contained applications, since updating a machine-wide runtime does not replace their embedded runtime.","status":"open","published_at":"2026-11-10T19:19:51+00:00","first_seen_at":"2026-11-10T19:24:55+00:00","triaged_at":"2026-11-10T23:30:48+00:00","updated_at":"2026-11-10T23:30:48+00:00","category":"runtime","confidence":0.7,"triage":{"at":"2026-11-10T23:30:48Z","model":"claude-haiku-5-5","output":{"fix":"- Move affected .NET 11 prerelease packages to `11.0.0` or later, per the advisory's Linux and macOS package tables.\n- Rebuild and redeploy self-contained applications, since updating a machine-wide runtime does not replace their embedded runtime.","reach":"network","title":".NET: Negotiate authentication accepts requests missing channel-binding data on Linux and macOS","impact":"medium","summary":"On Linux and macOS, .NET 11 prerelease runtimes accept a server-side Negotiate authentication request when the client omits required channel-binding information, even with PolicyEnforcement.Always set. An attacker who can reach the service may get past this protection check.","audience":"businesses","category":"runtime","nicknames":[],"who_cares":["dotnet","linux","macos","self-hosted","negotiate-auth"],"confidence":0.7,"fix_status":"available","needs_auth":"unknown","worst_case":"Authentication proceeds without channel-binding protection, weakening server-side login checks","analyst_note":"","how_to_check":"- Check the runtime version in use with `dotnet --list-runtimes` or the referenced `Microsoft.NETCore.App.Runtime` package version in the project file.\n- Look for server-side Negotiate authentication with `PolicyEnforcement.Always` in the application code or configuration.\n- Self-contained applications carry their own runtime, so check the version each one was published with.","plain_action":"","product_name":"","needs_analyst":false,"not_affected_if":["windows-only","no-negotiate-auth","preview-7-or-later","macos-rc-1-to-3"],"who_is_affected":"Applications that use server-side Negotiate authentication with PolicyEnforcement.Always on Linux or macOS, running .NET 11 prerelease runtimes (previews 1 through 6 on Linux and macOS, release candidates 1 through 3 on Linux). Preview 7 and later are not affected on Linux, and macOS release candidates 1 through 3 are not affected. Windows and .NET releases before 11 are not named in the advisory.","user_interaction":"no","product_ecosystem":"","needs_special_setup":"yes","severity_if_unknown":"medium"},"cost_usd":0.001257,"input_tokens":8754,"output_tokens":763,"severity_before":"medium"},"analyst_status":null,"analyst_note":null,"search":"'-118746':6A,14A,22A '-2026':5A,13A,21A '-636':65B,198C '/av':184C '/dotnet/announcements/issues/498':170C '/packages/microsoft.netcore.app.runtime.linux-arm)':256C,266C '/packages/microsoft.netcore.app.runtime.linux-arm64)':275C,285C '/packages/microsoft.netcore.app.runtime.linux-musl-arm)':296C,308C '/packages/microsoft.netcore.app.runtime.linux-musl-arm64)':319C,331C '/packages/microsoft.netcore.app.runtime.linux-musl-x64)':342C,354C '/packages/microsoft.netcore.app.runtime.linux-x64)':363C,373C '/packages/microsoft.netcore.app.runtime.osx-arm64)':409C '/packages/microsoft.netcore.app.runtime.osx-x64)':419C '11':81B,215C '11.0':243C,396C '11.0.0':257C,259C,261C,267C,269C,270C,276C,278C,280C,286C,288C,289C,297C,299C,301C,309C,311C,312C,320C,322C,324C,332C,334C,335C,343C,345C,347C,355C,357C,358C,364C,366C,368C,374C,376C,377C,385C,410C,412C,414C,420C,422C,424C,431C,433C,435C,438C '3.1':174C,183C '6.8':178C '7rhj':18A 'accept':84B,148C 'advisori':3A,125C,135C 'affect':140C,199C,208C,213C,248C,394C,401C,447C 'announc':159C,160C 'applic':141C 'architectur':204C 'arm':25A,27A,35A,39A,205C,253C,263C,293C,305C 'arm64':29A,31A,43A,47A,61A,206C,272C,282C,316C,328C,406C 'attack':106B 'auth':71B 'authent':90B,146C,230C,390C,443C 'base':179C 'bind':99B,155C,240C 'bypass':10A 'c':195C 'channel':98B,154C,239C 'channel-bind':97B,153C,238C 'check':117B 'client':94B,235C 'compon':143C 'cve':4A,12A,20A 'cvss':171C,182C 'cwe':64B,197C 'detail':172C 'dotnet':66B 'even':101B 'execut':118C 'featur':9A 'ff4h':17A 'fix':220C 'found':166C 'get':113B 'ghsa':16A 'ghsa-ff4h-7rhj-jrjf':15A 'github.com':169C 'github.com/dotnet/announcements/issues/498':168C 'guidanc':137C 'h/a':191C 'h/i':190C 'h/pr':186C 'host':75B 'inform':100B,128C,156C 'issu':163C,223C 'jrjf':19A 'linux':67B,77B,202C,244C,380C 'list':212C 'maco':68B,79B,203C,397C,426C 'may':112B 'medium':176C 'microsoft':1A,120C 'microsoft.netcore.app.runtime.linux':24A,26A,28A,30A,32A,36A,40A,44A,48A,52A,56A,58A,252C,262C,271C,281C,290C,302C,313C,325C,336C,348C,359C,369C 'microsoft.netcore.app.runtime.osx':60A,62A,405C,415C 'miss':158C 'musl':34A,38A,42A,46A,50A,54A,292C,304C,315C,327C,338C,350C 'musl-arm':33A,37A,291C,303C 'musl-arm64':41A,45A,314C,326C 'musl-x64':49A,53A,337C,349C 'n/ac':185C 'n/e':192C 'n/ui':187C 'negoti':70B,89B,145C,229C 'negotiate-auth':69B 'net':7A,23A,80B,133C,214C,242C,395C 'o/rc':194C 'occur':224C 'omit':95B,236C 'packag':209C,217C,246C,247C,382C,399C,400C,428C 'past':114B 'patch':250C,403C 'platform':200C,201C 'policyenforcement.always':103B,232C,388C,441C 'prereleas':82B 'preview.1':258C,277C,298C,321C,344C,365C,411C,421C 'preview.7.26381.103':260C,268C,279C,287C,300C,310C,323C,333C,346C,356C,367C,375C,386C,413C,423C,432C 'protect':116B 'provid':127C,136C 'r/s':188C 'rc.1.26425.128':434C 'rc.2.26504.105':436C 'rc.3.26522.148':439C 'reach':109B 'reject':387C,440C 'releas':122C 'request':91B,150C 'requir':96B,152C 'runtim':72B,83B,216C,245C,381C,398C,427C 'score':177C,180C 'secur':2A,8A,124C 'self':74B 'self-host':73B 'server':87B,227C 'server-sid':86B,226C 'servic':111B 'set':104B 'sever':175C 'side':88B,228C 'six':379C 'summari':119C 'tabl':211C 'token':241C 'u/c':189C 'u/rl':193C 'unix':144C 'updat':139C 'vector':181C 'version':173C,218C,221C,249C,251C,384C,402C,404C,430C 'vulner':11A,131C 'weak':196C 'www.nuget.org':255C,265C,274C,284C,295C,307C,318C,330C,341C,353C,362C,372C,408C,418C 'www.nuget.org/packages/microsoft.netcore.app.runtime.linux-arm)':254C,264C 'www.nuget.org/packages/microsoft.netcore.app.runtime.linux-arm64)':273C,283C 'www.nuget.org/packages/microsoft.netcore.app.runtime.linux-musl-arm)':294C,306C 'www.nuget.org/packages/microsoft.netcore.app.runtime.linux-musl-arm64)':317C,329C 'www.nuget.org/packages/microsoft.netcore.app.runtime.linux-musl-x64)':340C,352C 'www.nuget.org/packages/microsoft.netcore.app.runtime.linux-x64)':361C,371C 'www.nuget.org/packages/microsoft.netcore.app.runtime.osx-arm64)':407C 'www.nuget.org/packages/microsoft.netcore.app.runtime.osx-x64)':417C 'x64':51A,55A,57A,59A,63A,207C,339C,351C,360C,370C,416C","nicknames":[],"mitigations":[],"who_affected":"Applications that use server-side Negotiate authentication with PolicyEnforcement.Always on Linux or macOS, running .NET 11 prerelease runtimes (previews 1 through 6 on Linux and macOS, release candidates 1 through 3 on Linux). 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For higher limits or API access: sales@infrastack.ai"}