{"id":"ALSA-2026:21286","summary":"Important: .NET 8.0 security update","details":".NET is a managed-software framework. It implements a subset of the .NET framework APIs and several new APIs, and it includes a CLR implementation.  \n\nNew versions of .NET that address a security vulnerability are now available. The updated versions are .NET SDK 8.0.127 and .NET Runtime 8.0.27.Security Fix(es):  \n\n  * serialize-javascript: serialize-javascript: Denial of Service via specially crafted array-like object serialization (CVE-2026-34043)\n  * dotnet: .NET: infinite loop allows an attacker to cause a denial of service (CVE-2026-42899)\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":"2026-05-28T13:30:04.475845531Z","published":"2026-05-27T00:00:00Z","related":["CVE-2026-34043","CVE-2026-42899"],"references":[{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:21286"},{"type":"REPORT","url":"https://access.redhat.com/security/cve/CVE-2026-34043"},{"type":"REPORT","url":"https://access.redhat.com/security/cve/CVE-2026-42899"},{"type":"REPORT","url":"https://bugzilla.redhat.com/2453284"},{"type":"REPORT","url":"https://bugzilla.redhat.com/2476605"},{"type":"ADVISORY","url":"https://errata.almalinux.org/10/ALSA-2026-21286.html"}],"affected":[{"package":{"name":"aspnetcore-runtime-8.0","ecosystem":"AlmaLinux:10","purl":"pkg:rpm/almalinux/aspnetcore-runtime-8.0"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"8.0.27-1.el10_2"}]}],"database_specific":{"source":"https://github.com/AlmaLinux/osv-database/blob/master/advisories/almalinux10/ALSA-2026:21286.json"}},{"package":{"name":"aspnetcore-runtime-dbg-8.0","ecosystem":"AlmaLinux:10","purl":"pkg:rpm/almalinux/aspnetcore-runtime-dbg-8.0"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"8.0.27-1.el10_2"}]}],"database_specific":{"source":"https://github.com/AlmaLinux/osv-database/blob/master/advisories/almalinux10/ALSA-2026:21286.json"}},{"package":{"name":"aspnetcore-targeting-pack-8.0","ecosystem":"AlmaLinux:10","purl":"pkg:rpm/almalinux/aspnetcore-targeting-pack-8.0"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"8.0.27-1.el10_2"}]}],"database_specific":{"source":"https://github.com/AlmaLinux/osv-database/blob/master/advisories/almalinux10/ALSA-2026:21286.json"}},{"package":{"name":"dotnet-apphost-pack-8.0","ecosystem":"AlmaLinux:10","purl":"pkg:rpm/almalinux/dotnet-apphost-pack-8.0"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"8.0.27-1.el10_2"}]}],"database_specific":{"source":"https://github.com/AlmaLinux/osv-database/blob/master/advisories/almalinux10/ALSA-2026:21286.json"}},{"package":{"name":"dotnet-hostfxr-8.0","ecosystem":"AlmaLinux:10","purl":"pkg:rpm/almalinux/dotnet-hostfxr-8.0"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"8.0.27-1.el10_2"}]}],"database_specific":{"source":"https://github.com/AlmaLinux/osv-database/blob/master/advisories/almalinux10/ALSA-2026:21286.json"}},{"package":{"name":"dotnet-runtime-8.0","ecosystem":"AlmaLinux:10","purl":"pkg:rpm/almalinux/dotnet-runtime-8.0"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"8.0.27-1.el10_2"}]}],"database_specific":{"source":"https://github.com/AlmaLinux/osv-database/blob/master/advisories/almalinux10/ALSA-2026:21286.json"}},{"package":{"name":"dotnet-runtime-dbg-8.0","ecosystem":"AlmaLinux:10","purl":"pkg:rpm/almalinux/dotnet-runtime-dbg-8.0"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"8.0.27-1.el10_2"}]}],"database_specific":{"source":"https://github.com/AlmaLinux/osv-database/blob/master/advisories/almalinux10/ALSA-2026:21286.json"}},{"package":{"name":"dotnet-sdk-8.0","ecosystem":"AlmaLinux:10","purl":"pkg:rpm/almalinux/dotnet-sdk-8.0"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"8.0.127-1.el10_2"}]}],"database_specific":{"source":"https://github.com/AlmaLinux/osv-database/blob/master/advisories/almalinux10/ALSA-2026:21286.json"}},{"package":{"name":"dotnet-sdk-8.0-source-built-artifacts","ecosystem":"AlmaLinux:10","purl":"pkg:rpm/almalinux/dotnet-sdk-8.0-source-built-artifacts"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"8.0.127-1.el10_2"}]}],"database_specific":{"source":"https://github.com/AlmaLinux/osv-database/blob/master/advisories/almalinux10/ALSA-2026:21286.json"}},{"package":{"name":"dotnet-sdk-dbg-8.0","ecosystem":"AlmaLinux:10","purl":"pkg:rpm/almalinux/dotnet-sdk-dbg-8.0"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"8.0.127-1.el10_2"}]}],"database_specific":{"source":"https://github.com/AlmaLinux/osv-database/blob/master/advisories/almalinux10/ALSA-2026:21286.json"}},{"package":{"name":"dotnet-targeting-pack-8.0","ecosystem":"AlmaLinux:10","purl":"pkg:rpm/almalinux/dotnet-targeting-pack-8.0"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"8.0.27-1.el10_2"}]}],"database_specific":{"source":"https://github.com/AlmaLinux/osv-database/blob/master/advisories/almalinux10/ALSA-2026:21286.json"}},{"package":{"name":"dotnet-templates-8.0","ecosystem":"AlmaLinux:10","purl":"pkg:rpm/almalinux/dotnet-templates-8.0"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"8.0.127-1.el10_2"}]}],"database_specific":{"source":"https://github.com/AlmaLinux/osv-database/blob/master/advisories/almalinux10/ALSA-2026:21286.json"}}],"schema_version":"1.7.5"}