{"id":"UBUNTU-CVE-2026-107611","details":"An out-of-bounds read vulnerability in the ZRLE decoder of GlavSoft TightVNC Viewer for Windows before 2.8.88 allows a malicious or compromised VNC server to read heap memory beyond the palette allocation and crash the viewer by sending ZRLE-encoded tiles whose palette indices exceed the declared palette size. readPaletteRleTile() and readPackedPaletteTile() use the attacker-supplied index to look up colours without validating it against the palette size; out-of-bounds heap data is copied into the framebuffer (garbled display) or the read faults, terminating the viewer.","modified":"2026-10-14T03:22:50.444841064Z","published":"2026-10-13T00:00:00Z","upstream":["CVE-2026-107611"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-107611"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-107611"},{"type":"REPORT","url":"https://sourceforge.net/p/vnc-tight/bugs/1657/"},{"type":"REPORT","url":"https://www.tightvnc.com/whatsnew.php"}],"affected":[{"package":{"name":"tightvnc","ecosystem":"Ubuntu:Pro:14.04:LTS","purl":"pkg:deb/ubuntu/tightvnc?arch=source&distro=esm-infra-legacy%2Ftrusty"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.3.9-6.4","1.3.9-6.4ubuntu1","1.3.9-6.5+deb8u1build0.14.04.1~esm1"],"ecosystem_specific":{"binaries":[{"binary_name":"tightvncserver","binary_version":"1.3.9-6.5+deb8u1build0.14.04.1~esm1"},{"binary_name":"xtightvncviewer","binary_version":"1.3.9-6.5+deb8u1build0.14.04.1~esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-107611.json"}},{"package":{"name":"tightvnc","ecosystem":"Ubuntu:16.04:LTS","purl":"pkg:deb/ubuntu/tightvnc?arch=source&distro=xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.3.10-0ubuntu2","1.3.10-0ubuntu3"],"ecosystem_specific":{"binaries":[{"binary_name":"tightvncserver","binary_version":"1.3.10-0ubuntu3"},{"binary_name":"xtightvncviewer","binary_version":"1.3.10-0ubuntu3"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-107611.json"}},{"package":{"name":"tightvnc","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/tightvnc?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.3.10-0ubuntu3","1.3.10-0ubuntu4"],"ecosystem_specific":{"binaries":[{"binary_name":"tightvncserver","binary_version":"1.3.10-0ubuntu4"},{"binary_name":"xtightvncviewer","binary_version":"1.3.10-0ubuntu4"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-107611.json"}},{"package":{"name":"tightvnc","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/tightvnc?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.3.10-0ubuntu5"],"ecosystem_specific":{"binaries":[{"binary_version":"1.3.10-0ubuntu5","binary_name":"tightvncserver"},{"binary_version":"1.3.10-0ubuntu5","binary_name":"xtightvncviewer"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-107611.json"}},{"package":{"name":"tightvnc","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/tightvnc?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1:1.3.10-3","1:1.3.10-5"],"ecosystem_specific":{"binaries":[{"binary_name":"tightvncpasswd","binary_version":"1:1.3.10-5"},{"binary_version":"1:1.3.10-5","binary_name":"tightvncserver"},{"binary_name":"xtightvncviewer","binary_version":"1:1.3.10-5"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-107611.json"}},{"package":{"name":"tightvnc","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/tightvnc?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1:1.3.10-7","1:1.3.10-7build1","1:1.3.10-7build2","1:1.3.10-8"],"ecosystem_specific":{"binaries":[{"binary_version":"1:1.3.10-8","binary_name":"tightvncpasswd"},{"binary_name":"tightvncserver","binary_version":"1:1.3.10-8"},{"binary_name":"xtightvncviewer","binary_version":"1:1.3.10-8"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-107611.json"}},{"package":{"name":"tightvnc","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/tightvnc?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1:1.3.10-10","1:1.3.10-10build1"],"ecosystem_specific":{"binaries":[{"binary_name":"tightvncpasswd","binary_version":"1:1.3.10-10build1"},{"binary_name":"tightvncserver","binary_version":"1:1.3.10-10build1"},{"binary_name":"xtightvncviewer","binary_version":"1:1.3.10-10build1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-107611.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H"},{"type":"Ubuntu","score":"medium"}]}