{"id":"UBUNTU-CVE-2026-32853","details":"LibVNCServer versions 0.9.15 and prior (fixed in commit 009008e) contain a heap out-of-bounds read vulnerability in the UltraZip encoding handler that allows a malicious VNC server to cause information disclosure or application crash. Attackers can exploit improper bounds checking in the HandleUltraZipBPP() function by manipulating subrectangle header counts to read beyond the allocated heap buffer.","modified":"2026-06-23T22:00:08.073666806Z","published":"2026-03-24T18:16:00Z","related":["USN-8463-1"],"upstream":["CVE-2026-32853"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-32853"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-32853"},{"type":"REPORT","url":"https://github.com/LibVNC/libvncserver/security/advisories/GHSA-87q7-v983-qwcj"},{"type":"REPORT","url":"https://www.vulncheck.com/advisories/libvncserver-ultrazip-encoding-heap-out-of-bounds-read"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-8463-1"}],"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-2026-32853.json"}},{"package":{"name":"x11vnc","ecosystem":"Ubuntu:14.04:LTS","purl":"pkg:deb/ubuntu/x11vnc?arch=source&distro=trusty"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.9.13-1.1"],"ecosystem_specific":{"binaries":[{"binary_name":"x11vnc","binary_version":"0.9.13-1.1"},{"binary_name":"x11vnc-data","binary_version":"0.9.13-1.1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-32853.json"}},{"package":{"name":"libvncserver","ecosystem":"Ubuntu:16.04:LTS","purl":"pkg:deb/ubuntu/libvncserver?arch=source&distro=xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.9.10+dfsg-3","0.9.10+dfsg-3build1","0.9.10+dfsg-3ubuntu0.16.04.1","0.9.10+dfsg-3ubuntu0.16.04.2","0.9.10+dfsg-3ubuntu0.16.04.3","0.9.10+dfsg-3ubuntu0.16.04.4","0.9.10+dfsg-3ubuntu0.16.04.5","0.9.10+dfsg-3ubuntu0.16.04.6"],"ecosystem_specific":{"binaries":[{"binary_name":"libvncclient1","binary_version":"0.9.10+dfsg-3ubuntu0.16.04.6"},{"binary_name":"libvncserver-config","binary_version":"0.9.10+dfsg-3ubuntu0.16.04.6"},{"binary_version":"0.9.10+dfsg-3ubuntu0.16.04.6","binary_name":"libvncserver1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-32853.json"}},{"package":{"name":"vino","ecosystem":"Ubuntu:16.04:LTS","purl":"pkg:deb/ubuntu/vino?arch=source&distro=xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.8.1-0ubuntu6","3.8.1-0ubuntu7","3.8.1-0ubuntu8","3.8.1-0ubuntu9","3.8.1-0ubuntu9.1","3.8.1-0ubuntu9.2","3.8.1-0ubuntu9.3","3.8.1-0ubuntu9.4"],"ecosystem_specific":{"binaries":[{"binary_name":"vino","binary_version":"3.8.1-0ubuntu9.4"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-32853.json"}},{"package":{"name":"italc","ecosystem":"Ubuntu:16.04:LTS","purl":"pkg:deb/ubuntu/italc?arch=source&distro=xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1:2.0.2+dfsg1-3","1:2.0.2+dfsg1-4","1:2.0.2+dfsg1-4ubuntu0.1"],"ecosystem_specific":{"binaries":[{"binary_name":"italc-client","binary_version":"1:2.0.2+dfsg1-4ubuntu0.1"},{"binary_version":"1:2.0.2+dfsg1-4ubuntu0.1","binary_name":"italc-management-console"},{"binary_version":"1:2.0.2+dfsg1-4ubuntu0.1","binary_name":"italc-master"},{"binary_name":"libitalccore","binary_version":"1:2.0.2+dfsg1-4ubuntu0.1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-32853.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_version":"1.3.10-0ubuntu3","binary_name":"tightvncserver"},{"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-2026-32853.json"}},{"package":{"name":"x11vnc","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/x11vnc?arch=source&distro=esm-apps%2Fxenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.9.13-1.2build1","0.9.13-1.2ubuntu0.1~esm1"],"ecosystem_specific":{"binaries":[{"binary_name":"x11vnc","binary_version":"0.9.13-1.2ubuntu0.1~esm1"},{"binary_name":"x11vnc-data","binary_version":"0.9.13-1.2ubuntu0.1~esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-32853.json"}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