{"id":"UBUNTU-CVE-2026-34078","details":"Flatpak is a Linux application sandboxing and distribution framework. Prior to 1.16.4, the Flatpak portal accepts paths in the sandbox-expose options which can be app-controlled symlinks pointing at arbitrary paths. Flatpak run mounts the resolved host path in the sandbox. This gives apps access to all host files and can be used as a primitive to gain code execution in the host context. This vulnerability is fixed in 1.16.4.","modified":"2026-05-20T16:12:55.086434902Z","published":"2026-04-07T22:16:00Z","upstream":["CVE-2026-34078"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-34078"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-34078"},{"type":"REPORT","url":"https://github.com/flatpak/flatpak/security/advisories/GHSA-cc2q-qc34-jprg"}],"affected":[{"package":{"name":"flatpak","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/flatpak?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.8.7-5","0.10.0-1","0.10.0-2","0.10.1-1","0.10.2-1","0.10.2.1-1","0.10.2.1-2","0.10.3-1","0.11.1-0ubuntu1","0.11.3-2","0.11.3-3","0.11.7-0ubuntu0.1","1.0.1-0ubuntu0.1","1.0.6-0ubuntu0.1","1.0.7-0ubuntu0.18.04.1","1.0.8-0ubuntu0.18.04.1","1.0.9-0ubuntu0.1","1.0.9-0ubuntu0.2","1.0.9-0ubuntu0.3","1.0.9-0ubuntu0.4"],"ecosystem_specific":{"binaries":[{"binary_version":"1.0.9-0ubuntu0.4","binary_name":"flatpak"},{"binary_version":"1.0.9-0ubuntu0.4","binary_name":"flatpak-tests"},{"binary_version":"1.0.9-0ubuntu0.4","binary_name":"gir1.2-flatpak-1.0"},{"binary_version":"1.0.9-0ubuntu0.4","binary_name":"libflatpak0"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-34078.json"}},{"package":{"name":"flatpak","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/flatpak?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.4.3-1","1.6.0-1","1.6.1-1","1.6.2-1","1.6.3-1","1.6.5-0ubuntu0.1","1.6.5-0ubuntu0.2","1.6.5-0ubuntu0.3","1.6.5-0ubuntu0.4","1.6.5-0ubuntu0.5"],"ecosystem_specific":{"binaries":[{"binary_version":"1.6.5-0ubuntu0.5","binary_name":"flatpak"},{"binary_version":"1.6.5-0ubuntu0.5","binary_name":"flatpak-tests"},{"binary_version":"1.6.5-0ubuntu0.5","binary_name":"gir1.2-flatpak-1.0"},{"binary_version":"1.6.5-0ubuntu0.5","binary_name":"libflatpak0"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-34078.json"}},{"package":{"name":"flatpak","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/flatpak?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.10.2-3","1.12.2-1","1.12.2-2","1.12.3-1","1.12.4-1","1.12.5-1","1.12.6-1","1.12.7-1","1.12.7-1ubuntu0.1"],"ecosystem_specific":{"binaries":[{"binary_version":"1.12.7-1ubuntu0.1","binary_name":"flatpak"},{"binary_version":"1.12.7-1ubuntu0.1","binary_name":"flatpak-tests"},{"binary_version":"1.12.7-1ubuntu0.1","binary_name":"gir1.2-flatpak-1.0"},{"binary_version":"1.12.7-1ubuntu0.1","binary_name":"libflatpak0"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-34078.json"}},{"package":{"name":"flatpak","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/flatpak?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.14.4-2","1.14.5-1","1.14.5-1build1","1.14.5-1build4","1.14.5-1build5","1.14.5-1build6","1.14.6-1","1.14.6-1ubuntu0.1"],"ecosystem_specific":{"binaries":[{"binary_version":"1.14.6-1ubuntu0.1","binary_name":"flatpak"},{"binary_version":"1.14.6-1ubuntu0.1","binary_name":"flatpak-tests"},{"binary_version":"1.14.6-1ubuntu0.1","binary_name":"gir1.2-flatpak-1.0"},{"binary_version":"1.14.6-1ubuntu0.1","binary_name":"libflatpak0"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-34078.json"}},{"package":{"name":"flatpak","ecosystem":"Ubuntu:25.10","purl":"pkg:deb/ubuntu/flatpak?arch=source&distro=questing"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.16.0-2","1.16.1-1build1","1.16.1-2","1.16.1-2ubuntu1"],"ecosystem_specific":{"binaries":[{"binary_version":"1.16.1-2ubuntu1","binary_name":"flatpak"},{"binary_version":"1.16.1-2ubuntu1","binary_name":"flatpak-tests"},{"binary_version":"1.16.1-2ubuntu1","binary_name":"gir1.2-flatpak-1.0"},{"binary_version":"1.16.1-2ubuntu1","binary_name":"libflatpak0"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-34078.json"}},{"package":{"name":"flatpak","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/flatpak?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.16.1-2ubuntu1","1.16.1-3ubuntu1","1.16.2-1","1.16.3-1","1.16.3-1build1","1.16.4-1","1.16.4-2","1.16.6-1"],"ecosystem_specific":{"binaries":[{"binary_version":"1.16.6-1","binary_name":"flatpak"},{"binary_version":"1.16.6-1","binary_name":"flatpak-tests"},{"binary_version":"1.16.6-1","binary_name":"gir1.2-flatpak-1.0"},{"binary_version":"1.16.6-1","binary_name":"libflatpak0"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-34078.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H"},{"type":"Ubuntu","score":"medium"}]}