{"id":"CLSA-2026-1782812906","summary":"tigervnc: Fix of 8 CVEs","details":"- CVE-2026-50256: increase XLFDMAXFONTNAMELEN to 1024 and bound-check resolved\n  font-alias names before copying into the pattern buffers, preventing a\n  stack overflow during alias resolution (bundled xorg-server)\n- CVE-2026-50257, CVE-2026-50260: fix use-after-free when destroying sync\n  fences (miSyncDestroyFence) and counters (FreeCounter) whose trigger list\n  is shared across an Await group (bundled xorg-server)\n- CVE-2026-50258: reject XKB key types whose numLevels exceeds\n  XkbMaxShiftLevel in CheckKeyTypes, preventing a stack overflow in\n  XkbKeyTypesForCoreSymbols (bundled xorg-server)\n- CVE-2026-50259: clamp nMaps to the mapWidths buffer size in CheckKeyTypes\n  so an XkbSetMap resize request cannot overflow the stack buffer\n  (bundled xorg-server)\n- CVE-2026-50261: restart trigger-list iteration in SyncChangeCounter after\n  a trigger fires, preventing a use-after-free of freed trigger nodes\n  (bundled xorg-server)\n- CVE-2026-50262: enforce an exact request size in glx\n  ChangeDrawableAttributes, fixing a reversed length check that allowed an\n  out-of-bounds read/write (bundled xorg-server)\n- CVE-2026-50263: re-fetch the screen-saver screen private after\n  CheckScreenPrivate in CreateSaverWindow, preventing a use-after-free\n  (bundled xorg-server)","modified":"2026-10-26T09:43:53.223485102Z","published":"2026-06-30T09:48:54Z","upstream":["CVE-2026-50256","CVE-2026-50257","CVE-2026-50258","CVE-2026-50259","CVE-2026-50260","CVE-2026-50261","CVE-2026-50262","CVE-2026-50263"],"references":[{"type":"ADVISORY","url":"https://errata.tuxcare.com/els_os/tuxcare9.6esu/CLSA-2026-1782812906.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"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-50262"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-50263"}],"affected":[{"package":{"name":"tigervnc","ecosystem":"TuxCare:AlmaLinux:9.6","purl":"pkg:rpm/tuxcare/tigervnc?distro=almalinux-9.6"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.14.1-9.el9_6.tuxcare.els4"}]}],"database_specific":{"source":"https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/almalinux9.6esu/CLSA-2026-1782812906.json"}},{"package":{"name":"tigervnc-icons","ecosystem":"TuxCare:AlmaLinux:9.6","purl":"pkg:rpm/tuxcare/tigervnc-icons?distro=almalinux-9.6"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.14.1-9.el9_6.tuxcare.els4"}]}],"database_specific":{"source":"https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/almalinux9.6esu/CLSA-2026-1782812906.json"}},{"package":{"name":"tigervnc-license","ecosystem":"TuxCare:AlmaLinux:9.6","purl":"pkg:rpm/tuxcare/tigervnc-license?distro=almalinux-9.6"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.14.1-9.el9_6.tuxcare.els4"}]}],"database_specific":{"source":"https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/almalinux9.6esu/CLSA-2026-1782812906.json"}},{"package":{"name":"tigervnc-selinux","ecosystem":"TuxCare:AlmaLinux:9.6","purl":"pkg:rpm/tuxcare/tigervnc-selinux?distro=almalinux-9.6"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.14.1-9.el9_6.tuxcare.els4"}]}],"database_specific":{"source":"https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/almalinux9.6esu/CLSA-2026-1782812906.json"}},{"package":{"name":"tigervnc-server","ecosystem":"TuxCare:AlmaLinux:9.6","purl":"pkg:rpm/tuxcare/tigervnc-server?distro=almalinux-9.6"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.14.1-9.el9_6.tuxcare.els4"}]}],"database_specific":{"source":"https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/almalinux9.6esu/CLSA-2026-1782812906.json"}},{"package":{"name":"tigervnc-server-minimal","ecosystem":"TuxCare:AlmaLinux:9.6","purl":"pkg:rpm/tuxcare/tigervnc-server-minimal?distro=almalinux-9.6"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.14.1-9.el9_6.tuxcare.els4"}]}],"database_specific":{"source":"https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/almalinux9.6esu/CLSA-2026-1782812906.json"}},{"package":{"name":"tigervnc-server-module","ecosystem":"TuxCare:AlmaLinux:9.6","purl":"pkg:rpm/tuxcare/tigervnc-server-module?distro=almalinux-9.6"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.14.1-9.el9_6.tuxcare.els4"}]}],"database_specific":{"source":"https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/almalinux9.6esu/CLSA-2026-1782812906.json"}}],"schema_version":"1.9.0"}