{"id":"UBUNTU-CVE-2026-96280","details":"The OCI delta stream parser read sizes as guint64 but passed them to GLib I/O and allocation functions expecting gsize (32 bits on 32-bit systems), causing undersized allocations while subsequent operations use the original 64-bit size, leading to heap buffer overflows. An attacker controlling an OCI registry can craft a delta stream that triggers this during flatpak install/update, potentially achieving code execution on 32-bit systems.","modified":"2026-11-04T20:04:29.677217963Z","published":"2026-09-27T21:17:00Z","upstream":["CVE-2026-96280"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-96280"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-96280"},{"type":"REPORT","url":"https://github.com/flatpak/flatpak/security/advisories/GHSA-jr92-2v97-wgvc"}],"affected":[{"package":{"name":"flatpak","ecosystem":"Ubuntu:Pro:22.04:LTS","purl":"pkg:deb/ubuntu/flatpak?arch=source&distro=esm-apps%2Fjammy"},"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","1.12.7-1ubuntu0.1+esm1"],"ecosystem_specific":{"binaries":[{"binary_name":"flatpak","binary_version":"1.12.7-1ubuntu0.1+esm1"},{"binary_name":"flatpak-tests","binary_version":"1.12.7-1ubuntu0.1+esm1"},{"binary_name":"gir1.2-flatpak-1.0","binary_version":"1.12.7-1ubuntu0.1+esm1"},{"binary_name":"libflatpak0","binary_version":"1.12.7-1ubuntu0.1+esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-96280.json"}},{"package":{"name":"flatpak","ecosystem":"Ubuntu:Pro:24.04:LTS","purl":"pkg:deb/ubuntu/flatpak?arch=source&distro=esm-apps%2Fnoble"},"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","1.14.6-1ubuntu0.1+esm1"],"ecosystem_specific":{"binaries":[{"binary_version":"1.14.6-1ubuntu0.1+esm1","binary_name":"flatpak"},{"binary_name":"flatpak-tests","binary_version":"1.14.6-1ubuntu0.1+esm1"},{"binary_name":"gir1.2-flatpak-1.0","binary_version":"1.14.6-1ubuntu0.1+esm1"},{"binary_name":"libflatpak0","binary_version":"1.14.6-1ubuntu0.1+esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-96280.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_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","binary_version":"1.16.6-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-96280.json"}}],"schema_version":"1.9.2","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H"},{"type":"Ubuntu","score":"medium"}]}