{"id":"CLSA-2026-1789640442","summary":"osbuild-composer: Fix of CVE-2026-39821","details":"- CVE-2026-39821: reject xn-- Punycode labels that decode to an all-ASCII label in the\n  vendored golang.org/x/net/idna, so ToASCII and ToUnicode no longer resolve names such\n  as xn--example-.com to example.com without an error, preventing privilege escalation in\n  programs that perform privilege checks on the ASCII hostname\n- CVE-2026-39821: rebuild against golang \u003e= 1.22.9-1.el9_2.tuxcare.els19 so the copy of\n  golang.org/x/net/idna vendored into the Go standard library, which net/http uses to\n  convert outbound request hosts, carries the same rejection","modified":"2026-10-26T09:30:49.009167707Z","published":"2026-09-17T10:20:53Z","upstream":["CVE-2026-39821"],"references":[{"type":"ADVISORY","url":"https://errata.tuxcare.com/els_os/almalinux9.2esu/CLSA-2026-1789640442.html"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-39821"}],"affected":[{"package":{"name":"osbuild-composer","ecosystem":"TuxCare:AlmaLinux:9.2","purl":"pkg:rpm/tuxcare/osbuild-composer?distro=almalinux-9.2"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"76-2.el9_2.2.alma.tuxcare.els10"}]}],"database_specific":{"source":"https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/almalinux9.2esu/CLSA-2026-1789640442.json"}},{"package":{"name":"osbuild-composer-core","ecosystem":"TuxCare:AlmaLinux:9.2","purl":"pkg:rpm/tuxcare/osbuild-composer-core?distro=almalinux-9.2"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"76-2.el9_2.2.alma.tuxcare.els10"}]}],"database_specific":{"source":"https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/almalinux9.2esu/CLSA-2026-1789640442.json"}},{"package":{"name":"osbuild-composer-dnf-json","ecosystem":"TuxCare:AlmaLinux:9.2","purl":"pkg:rpm/tuxcare/osbuild-composer-dnf-json?distro=almalinux-9.2"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"76-2.el9_2.2.alma.tuxcare.els10"}]}],"database_specific":{"source":"https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/almalinux9.2esu/CLSA-2026-1789640442.json"}},{"package":{"name":"osbuild-composer-tests","ecosystem":"TuxCare:AlmaLinux:9.2","purl":"pkg:rpm/tuxcare/osbuild-composer-tests?distro=almalinux-9.2"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"76-2.el9_2.2.alma.tuxcare.els10"}]}],"database_specific":{"source":"https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/almalinux9.2esu/CLSA-2026-1789640442.json"}},{"package":{"name":"osbuild-composer-worker","ecosystem":"TuxCare:AlmaLinux:9.2","purl":"pkg:rpm/tuxcare/osbuild-composer-worker?distro=almalinux-9.2"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"76-2.el9_2.2.alma.tuxcare.els10"}]}],"database_specific":{"source":"https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/almalinux9.2esu/CLSA-2026-1789640442.json"}}],"schema_version":"1.9.0"}