{"id":"ALSA-2026:86170","summary":"Critical: .NET 9.0 security, bug fix, and enhancement update","details":".NET is a fast, lightweight and modular platform for creating cross platform applications that work on Linux, macOS and Windows. It particularly focuses on creating console applications, web applications and micro-services. .NET contains a runtime conforming to .NET Standards a set of framework libraries, an SDK containing compilers and a 'dotnet' application to drive everything.  \n\nSDK version: 9.0.122  \nRuntime version: 9.0.21  \n\nSecurity Fix(es):  \n\n  * dotnet10.0: dotnet9.0: dotnet: dotnet8.0: .NET Denial of Service Vulnerability (CVE-2026-58280)\n  * dotnet10.0: dotnet8.0: dotnet9.0: dotnet: .NET Information Disclosure Vulnerability (CVE-2026-66822)\n  * dotnet9.0: dotnet: dotnet10.0: dotnet8.0: .NET Denial of Service Vulnerability (CVE-2026-69651)\n  * dotnet8.0: dotnet10.0: dotnet: dotnet9.0: ASP.NET Core Denial of Service Vulnerability (CVE-2026-70159)\n  * dotnet10.0: dotnet8.0: dotnet9.0: ASP.NET Core Elevation of Privilege Vulnerability (CVE-2026-70175)\n  * dotnet10.0: dotnet8.0: dotnet9.0: ASP.NET Core Elevation of Privilege Vulnerability (CVE-2026-70179)\n  * dotnet9.0: dotnet8.0: dotnet10.0: ASP.NET Core Denial of Service Vulnerability (CVE-2026-70181)\n  * dotnet: dotnet10.0: dotnet9.0: dotnet8.0: ASP.NET Core Elevation of Privilege Vulnerability (CVE-2026-70183)\n  * dotnet10.0: dotnet9.0: dotnet8.0: ASP.NET Core Denial of Service Vulnerability (CVE-2026-70186)\n  * dotnet: ASP.NET Core Security Feature Bypass Vulnerability (CVE-2026-70188)\n  * dotnet9.0: dotnet8.0: dotnet10.0: ASP.NET Core Denial of Service Vulnerability (CVE-2026-70196)\n  * dotnet: ASP.NET Core Tampering Vulnerability (CVE-2026-88092)\n  * dotnet10.0: dotnet8.0: dotnet9.0: dotnet: MessagePack: Nested arrays can blow past buffer length limits (CVE-2026-92707)\n  * dotnet: dotnet8.0: dotnet9.0: dotnet10.0: .NET Elevation of Privilege Vulnerability (CVE-2026-96225)\n  * dotnet9.0: dotnet10.0: dotnet8.0: dotnet: ASP.NET Core Remote Code Execution Vulnerability (CVE-2026-96230)\n  * dotnet: dotnet9.0: dotnet10.0: dotnet8.0: .NET Elevation of Privilege Vulnerability (CVE-2026-96231)\n  * dotnet10.0: dotnet: dotnet8.0: dotnet9.0: ASP.NET Core Denial of Service Vulnerability (CVE-2026-96233)\n  * dotnet: dotnet10.0: dotnet9.0: dotnet8.0: ASP.NET Core Denial of Service Vulnerability (CVE-2026-96236)\n  * dotnet8.0: dotnet10.0: dotnet9.0: .NET Remote Code Execution Vulnerability (CVE-2026-96237)\n  * dotnet8.0: dotnet10.0: dotnet9.0: dotnet: .NET Security Feature Bypass Vulnerability (CVE-2026-96238)\n\n\nBug Fix(es) and Enhancement(s):  \n\n  * Update .NET 9.0 to SDK 9.0.122 and Runtime 9.0.21 (JIRA:AlmaLinux-277797)\n\n\nFor more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.\n","modified":"2026-10-21T16:30:02.530493733Z","published":"2026-10-20T00:00:00Z","related":["CVE-2026-58280","CVE-2026-66822","CVE-2026-69651","CVE-2026-70159","CVE-2026-70175","CVE-2026-70179","CVE-2026-70181","CVE-2026-70183","CVE-2026-70186","CVE-2026-70188","CVE-2026-70196","CVE-2026-88092","CVE-2026-92707","CVE-2026-96225","CVE-2026-96230","CVE-2026-96231","CVE-2026-96233","CVE-2026-96236","CVE-2026-96237","CVE-2026-96238"],"references":[{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:86170"},{"type":"REPORT","url":"https://access.redhat.com/security/cve/CVE-2026-58280"},{"type":"REPORT","url":"https://access.redhat.com/security/cve/CVE-2026-66822"},{"type":"REPORT","url":"https://access.redhat.com/security/cve/CVE-2026-69651"},{"type":"REPORT","url":"https://access.redhat.com/security/cve/CVE-2026-70159"},{"type":"REPORT","url":"https://access.redhat.com/security/cve/CVE-2026-70175"},{"type":"REPORT","url":"https://access.redhat.com/security/cve/CVE-2026-70179"},{"type":"REPORT","url":"https://access.redhat.com/security/cve/CVE-2026-70181"},{"type":"REPORT","url":"https://access.redhat.com/security/cve/CVE-2026-70183"},{"type":"REPORT","url":"https://access.redhat.com/security/cve/CVE-2026-70186"},{"type":"REPORT","url":"https://access.redhat.com/security/cve/CVE-2026-70188"},{"type":"REPORT","url":"https://access.redhat.com/security/cve/CVE-2026-70196"},{"type":"REPORT","url":"https://access.redhat.com/security/cve/CVE-2026-88092"},{"type":"REPORT","url":"https://access.redhat.com/security/cve/CVE-2026-92707"},{"type":"REPORT","url":"https://access.redhat.com/security/cve/CVE-2026-96225"},{"type":"REPORT","url":"https://access.redhat.com/security/cve/CVE-2026-96230"},{"type":"REPORT","url":"https://access.redhat.com/security/cve/CVE-2026-96231"},{"type":"REPORT","url":"https://access.redhat.com/security/cve/CVE-2026-96233"},{"type":"REPORT","url":"https://access.redhat.com/security/cve/CVE-2026-96236"},{"type":"REPORT","url":"https://access.redhat.com/security/cve/CVE-2026-96237"},{"type":"REPORT","url":"https://access.redhat.com/security/cve/CVE-2026-96238"},{"type":"REPORT","url":"https://bugzilla.redhat.com/2548778"},{"type":"REPORT","url":"https://bugzilla.redhat.com/2548781"},{"type":"REPORT","url":"https://bugzilla.redhat.com/2548784"},{"type":"REPORT","url":"https://bugzilla.redhat.com/2548786"},{"type":"REPORT","url":"https://bugzilla.redhat.com/2548787"},{"type":"REPORT","url":"https://bugzilla.redhat.com/2548790"},{"type":"REPORT","url":"https://bugzilla.redhat.com/2548791"},{"type":"REPORT","url":"https://bugzilla.redhat.com/2548792"},{"type":"REPORT","url":"https://bugzilla.redhat.com/2548793"},{"type":"REPORT","url":"https://bugzilla.redhat.com/2548796"},{"type":"REPORT","url":"https://bugzilla.redhat.com/2548798"},{"type":"REPORT","url":"https://bugzilla.redhat.com/2548799"},{"type":"REPORT","url":"https://bugzilla.redhat.com/2548800"},{"type":"REPORT","url":"https://bugzilla.redhat.com/2548803"},{"type":"REPORT","url":"https://bugzilla.redhat.com/2548804"},{"type":"REPORT","url":"https://bugzilla.redhat.com/2548805"},{"type":"REPORT","url":"https://bugzilla.redhat.com/2548806"},{"type":"REPORT","url":"https://bugzilla.redhat.com/2548807"},{"type":"REPORT","url":"https://bugzilla.redhat.com/2548808"},{"type":"REPORT","url":"https://bugzilla.redhat.com/2548809"},{"type":"ADVISORY","url":"https://errata.almalinux.org/8/ALSA-2026-86170.html"}],"affected":[{"package":{"name":"aspnetcore-runtime-9.0","ecosystem":"AlmaLinux:8","purl":"pkg:rpm/almalinux/aspnetcore-runtime-9.0"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"9.0.21-1.el8_10"}]}],"database_specific":{"source":"https://github.com/AlmaLinux/osv-database/blob/master/advisories/almalinux8/ALSA-2026:86170.json"}},{"package":{"name":"aspnetcore-runtime-dbg-9.0","ecosystem":"AlmaLinux:8","purl":"pkg:rpm/almalinux/aspnetcore-runtime-dbg-9.0"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"9.0.21-1.el8_10"}]}],"database_specific":{"source":"https://github.com/AlmaLinux/osv-database/blob/master/advisories/almalinux8/ALSA-2026:86170.json"}},{"package":{"name":"aspnetcore-targeting-pack-9.0","ecosystem":"AlmaLinux:8","purl":"pkg:rpm/almalinux/aspnetcore-targeting-pack-9.0"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"9.0.21-1.el8_10"}]}],"database_specific":{"source":"https://github.com/AlmaLinux/osv-database/blob/master/advisories/almalinux8/ALSA-2026:86170.json"}},{"package":{"name":"dotnet-apphost-pack-9.0","ecosystem":"AlmaLinux:8","purl":"pkg:rpm/almalinux/dotnet-apphost-pack-9.0"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"9.0.21-1.el8_10"}]}],"database_specific":{"source":"https://github.com/AlmaLinux/osv-database/blob/master/advisories/almalinux8/ALSA-2026:86170.json"}},{"package":{"name":"dotnet-hostfxr-9.0","ecosystem":"AlmaLinux:8","purl":"pkg:rpm/almalinux/dotnet-hostfxr-9.0"},"ranges":[{"type":"ECOSYSTEM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