{"id":"CLSA-2026-1782904895","summary":"tigervnc: Fix of 6 CVEs","details":"- CVE-2026-50256: fix stack overflow in font alias resolution by widening\n  XLFDMAXFONTNAMELEN to match libXfont2 MAXFONTNAMELEN (bundled Xvnc xserver)\n- CVE-2026-50257: fix use-after-free of sync fences in miSyncDestroyFence\n- CVE-2026-50258: fix stack overflow in XKB CheckKeyTypes\n- CVE-2026-50259: fix stack overflow in XKB _XkbSetMapChecks key-type check\n- CVE-2026-50260: fix use-after-free of sync counters in FreeCounter\n- CVE-2026-50261: fix use-after-free in SyncChangeCounter\n- patches backported into the bundled xserver 21.1.3 tree, reused from the\n  xorg-x11-server-Xwayland sibling change","modified":"2026-10-26T09:30:24.048222704Z","published":"2026-07-01T11:21:57Z","upstream":["CVE-2026-50256","CVE-2026-50257","CVE-2026-50258","CVE-2026-50259","CVE-2026-50260","CVE-2026-50261"],"references":[{"type":"ADVISORY","url":"https://errata.tuxcare.com/els_os/almalinux9.2esu/CLSA-2026-1782904895.html"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-50256"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-50257"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-50258"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-50259"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-50260"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-50261"}],"affected":[{"package":{"name":"tigervnc","ecosystem":"TuxCare:AlmaLinux:9.2","purl":"pkg:rpm/tuxcare/tigervnc?distro=almalinux-9.2"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.12.0-13.el9_2.tuxcare.els25"}]}],"database_specific":{"source":"https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/almalinux9.2esu/CLSA-2026-1782904895.json"}},{"package":{"name":"tigervnc-icons","ecosystem":"TuxCare:AlmaLinux:9.2","purl":"pkg:rpm/tuxcare/tigervnc-icons?distro=almalinux-9.2"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.12.0-13.el9_2.tuxcare.els25"}]}],"database_specific":{"source":"https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/almalinux9.2esu/CLSA-2026-1782904895.json"}},{"package":{"name":"tigervnc-license","ecosystem":"TuxCare:AlmaLinux:9.2","purl":"pkg:rpm/tuxcare/tigervnc-license?distro=almalinux-9.2"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.12.0-13.el9_2.tuxcare.els25"}]}],"database_specific":{"source":"https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/almalinux9.2esu/CLSA-2026-1782904895.json"}},{"package":{"name":"tigervnc-selinux","ecosystem":"TuxCare:AlmaLinux:9.2","purl":"pkg:rpm/tuxcare/tigervnc-selinux?distro=almalinux-9.2"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.12.0-13.el9_2.tuxcare.els25"}]}],"database_specific":{"source":"https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/almalinux9.2esu/CLSA-2026-1782904895.json"}},{"package":{"name":"tigervnc-server","ecosystem":"TuxCare:AlmaLinux:9.2","purl":"pkg:rpm/tuxcare/tigervnc-server?distro=almalinux-9.2"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.12.0-13.el9_2.tuxcare.els25"}]}],"database_specific":{"source":"https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/almalinux9.2esu/CLSA-2026-1782904895.json"}},{"package":{"name":"tigervnc-server-minimal","ecosystem":"TuxCare:AlmaLinux:9.2","purl":"pkg:rpm/tuxcare/tigervnc-server-minimal?distro=almalinux-9.2"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.12.0-13.el9_2.tuxcare.els25"}]}],"database_specific":{"source":"https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/almalinux9.2esu/CLSA-2026-1782904895.json"}},{"package":{"name":"tigervnc-server-module","ecosystem":"TuxCare:AlmaLinux:9.2","purl":"pkg:rpm/tuxcare/tigervnc-server-module?distro=almalinux-9.2"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.12.0-13.el9_2.tuxcare.els25"}]}],"database_specific":{"source":"https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/almalinux9.2esu/CLSA-2026-1782904895.json"}}],"schema_version":"1.9.0"}