{"id":"ALSA-2026:28923","summary":"Important: tigervnc security update","details":"Virtual Network Computing (VNC) is a remote display system which allows users to view a computing desktop environment not only on the machine where it is running, but from anywhere on the Internet and from a wide variety of machine architectures. TigerVNC is a suite of VNC servers and clients.  \n\nSecurity Fix(es):  \n\n  * xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: stack buffer overflow in font alias resolution due to libXfont2 name length mismatch (CVE-2026-50256)\n  * xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: use-after-free in miSyncDestroyFence() (CVE-2026-50257)\n  * xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: stack buffer overflow in XKB key types due to unchecked shift levels (CVE-2026-50258)\n  * xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: stack buffer overflow in XKB SetMap request via mapWidths indexing (CVE-2026-50259)\n  * xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: use-after-free in FreeCounter() (CVE-2026-50260)\n  * xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: use-after-free in SyncChangeCounter() (CVE-2026-50261)\n  * xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: out-of-bounds read/write in GLX ChangeDrawableAttributes (CVE-2026-50262)\n  * xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: use-after-free information disclosure in CreateSaverWindow() (CVE-2026-50263)\n  * xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: out-of-bounds heap write in DRI2 DRIGetBuffers/DRIGetBuffersWithFormat (CVE-2026-50264)\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":"2026-06-25T14:00:04.598954855Z","published":"2026-06-24T00:00:00Z","related":["CVE-2026-50256","CVE-2026-50257","CVE-2026-50258","CVE-2026-50259","CVE-2026-50260","CVE-2026-50261","CVE-2026-50262","CVE-2026-50263","CVE-2026-50264"],"references":[{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:28923"},{"type":"REPORT","url":"https://access.redhat.com/security/cve/CVE-2026-50256"},{"type":"REPORT","url":"https://access.redhat.com/security/cve/CVE-2026-50257"},{"type":"REPORT","url":"https://access.redhat.com/security/cve/CVE-2026-50258"},{"type":"REPORT","url":"https://access.redhat.com/security/cve/CVE-2026-50259"},{"type":"REPORT","url":"https://access.redhat.com/security/cve/CVE-2026-50260"},{"type":"REPORT","url":"https://access.redhat.com/security/cve/CVE-2026-50261"},{"type":"REPORT","url":"https://access.redhat.com/security/cve/CVE-2026-50262"},{"type":"REPORT","url":"https://access.redhat.com/security/cve/CVE-2026-50263"},{"type":"REPORT","url":"https://access.redhat.com/security/cve/CVE-2026-50264"},{"type":"REPORT","url":"https://bugzilla.redhat.com/2485380"},{"type":"REPORT","url":"https://bugzilla.redhat.com/2485382"},{"type":"REPORT","url":"https://bugzilla.redhat.com/2485383"},{"type":"REPORT","url":"https://bugzilla.redhat.com/2485384"},{"type":"REPORT","url":"https://bugzilla.redhat.com/2485385"},{"type":"REPORT","url":"https://bugzilla.redhat.com/2485386"},{"type":"REPORT","url":"https://bugzilla.redhat.com/2485387"},{"type":"REPORT","url":"https://bugzilla.redhat.com/2485388"},{"type":"REPORT","url":"https://bugzilla.redhat.com/2485389"},{"type":"ADVISORY","url":"https://errata.almalinux.org/8/ALSA-2026-28923.html"}],"affected":[{"package":{"name":"tigervnc","ecosystem":"AlmaLinux:8","purl":"pkg:rpm/almalinux/tigervnc"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.15.0-10.el8_10"}]}],"database_specific":{"source":"https://github.com/AlmaLinux/osv-database/blob/master/advisories/almalinux8/ALSA-2026:28923.json"}},{"package":{"name":"tigervnc-icons","ecosystem":"AlmaLinux:8","purl":"pkg:rpm/almalinux/tigervnc-icons"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.15.0-10.el8_10"}]}],"database_specific":{"source":"https://github.com/AlmaLinux/osv-database/blob/master/advisories/almalinux8/ALSA-2026:28923.json"}},{"package":{"name":"tigervnc-license","ecosystem":"AlmaLinux:8","purl":"pkg:rpm/almalinux/tigervnc-license"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.15.0-10.el8_10"}]}],"database_specific":{"source":"https://github.com/AlmaLinux/osv-database/blob/master/advisories/almalinux8/ALSA-2026:28923.json"}},{"package":{"name":"tigervnc-selinux","ecosystem":"AlmaLinux:8","purl":"pkg:rpm/almalinux/tigervnc-selinux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.15.0-10.el8_10"}]}],"database_specific":{"source":"https://github.com/AlmaLinux/osv-database/blob/master/advisories/almalinux8/ALSA-2026:28923.json"}},{"package":{"name":"tigervnc-server","ecosystem":"AlmaLinux:8","purl":"pkg:rpm/almalinux/tigervnc-server"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.15.0-10.el8_10"}]}],"database_specific":{"source":"https://github.com/AlmaLinux/osv-database/blob/master/advisories/almalinux8/ALSA-2026:28923.json"}},{"package":{"name":"tigervnc-server-minimal","ecosystem":"AlmaLinux:8","purl":"pkg:rpm/almalinux/tigervnc-server-minimal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.15.0-10.el8_10"}]}],"database_specific":{"source":"https://github.com/AlmaLinux/osv-database/blob/master/advisories/almalinux8/ALSA-2026:28923.json"}},{"package":{"name":"tigervnc-server-module","ecosystem":"AlmaLinux:8","purl":"pkg:rpm/almalinux/tigervnc-server-module"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.15.0-10.el8_10"}]}],"database_specific":{"source":"https://github.com/AlmaLinux/osv-database/blob/master/advisories/almalinux8/ALSA-2026:28923.json"}}],"schema_version":"1.7.5"}