{"id":"CVE-2026-96279","aliases":["DEBIAN-CVE-2026-96279","EUVD-2026-88013","UBUNTU-CVE-2026-96279"],"status":"published","title":"Flatpak: flatpak: path traversal issue in oci archive extraction via hardlinks","description":"A malicious OCI registry can hardlink arbitrary host files into the extraction directory when a user installs or updates a Flatpak application from an OCI remote, allowing disclosure of arbitrary host file contents. For system-wide installs running as root, this includes sensitive files such as /etc/shadow.","severity":{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.00425,"percentile":0.37242,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-59"],"published":"2026-09-27T19:49:17Z","modified":"2026-11-06T02:14:14Z","fixes":[{"ecosystem":"Debian:14","package":"flatpak","fixed_in":["1.18.1-1"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Debian:14","package":"flatpak","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.18.1-1"}]}],"versions":["1.16.1-1","1.16.1-2","1.16.1-3","1.16.2-1","1.16.2-1~deb13u1","1.16.3-1","1.16.3-1~deb13u1","1.16.4-1","1.16.4-2","1.16.5-1","1.16.6-1","1.16.6-1~deb13u1","1.16.6-1~deb13u1~bpo12+1","1.16.6-1~deb13u2","1.16.6-1~deb13u3","1.17.2-1","1.17.3-1","1.17.3-2","1.17.6-1","1.18.0-1"]},{"source":"osv","ecosystem":"Ubuntu:Pro:18.04:LTS","package":"flatpak","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","1.0.9-0ubuntu0.4+esm1"]},{"source":"osv","ecosystem":"Ubuntu:Pro:20.04:LTS","package":"flatpak","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","1.6.5-0ubuntu0.5+esm1"]},{"source":"osv","ecosystem":"Ubuntu:Pro:22.04:LTS","package":"flatpak","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"]},{"source":"osv","ecosystem":"Ubuntu:Pro:24.04:LTS","package":"flatpak","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"]},{"source":"osv","ecosystem":"Ubuntu:26.04:LTS","package":"flatpak","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"]}],"products":[{"vendor":"red hat","product":"red hat enterprise linux 10"},{"vendor":"red hat","product":"red hat enterprise linux 7"},{"vendor":"red hat","product":"red hat enterprise linux 8"},{"vendor":"red hat","product":"red hat enterprise linux 9"}],"references":[{"url":"https://access.redhat.com/security/cve/CVE-2026-96279","tags":["vdb-entry","x_refsource_REDHAT"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2539417","tags":["issue-tracking","x_refsource_REDHAT"]},{"url":"https://github.com/flatpak/flatpak/security/advisories/GHSA-9rww-v4mm-x4jg","tags":["report"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-96279","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2026-96279","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-96279","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2026-96279","title":"Flatpak: flatpak: path traversal issue in oci archive extraction via hardlinks","description":"A malicious OCI registry can hardlink arbitrary host files into the extraction directory when a user installs or updates a Flatpak application from an OCI remote, allowing disclosure of arbitrary host file contents. For system-wide installs running as root, this includes sensitive files such as /etc/shadow.","status":"published","published":"2026-09-27T19:49:17.239Z","modified":"2026-11-06T02:14:14.596Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N","level":"medium","assessor":"cna"}],"cwes":["CWE-59"],"updated_at":"2026-11-06T03:26:01.286096Z"}],"euvd":[{"id":"EUVD-2026-88013","description":"A malicious OCI registry can hardlink arbitrary host files into the extraction directory when a user installs or updates a Flatpak application from an OCI remote, allowing disclosure of arbitrary host file contents. For system-wide installs running as root, this includes sensitive files such as /etc/shadow.","status":"published","published":"2026-09-27T19:49:17Z","modified":"2026-11-06T02:14:14Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N","level":"medium"}],"updated_at":"2026-11-06T03:02:58.554056Z"}],"nvd":[{"id":"CVE-2026-96279","description":"A malicious OCI registry can hardlink arbitrary host files into the extraction directory when a user installs or updates a Flatpak application from an OCI remote, allowing disclosure of arbitrary host file contents. For system-wide installs running as root, this includes sensitive files such as /etc/shadow.","status":"published","published":"2026-09-27T20:16:53.043Z","modified":"2026-11-06T03:16:48.123Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N","level":"medium","assessor":"secondary"}],"cwes":["CWE-59"],"updated_at":"2026-11-06T06:59:05.647867Z"}],"osv":[{"id":"DEBIAN-CVE-2026-96279","description":"A malicious OCI registry can hardlink arbitrary host files into the extraction directory when a user installs or updates a Flatpak application from an OCI remote, allowing disclosure of arbitrary host file contents. For system-wide installs running as root, this includes sensitive files such as /etc/shadow.","status":"published","published":"2026-09-27T20:16:53.043Z","modified":"2026-09-30T08:47:28.085439807Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N","level":"medium"}],"updated_at":"2026-11-02T15:46:07.324252Z"},{"id":"UBUNTU-CVE-2026-96279","description":"A malicious OCI registry can hardlink arbitrary host files into the extraction directory when a user installs or updates a Flatpak application from an OCI remote, allowing disclosure of arbitrary host file contents. For system-wide installs running as root, this includes sensitive files such as /etc/shadow.","status":"published","published":"2026-09-27T20:16:00Z","modified":"2026-10-01T00:22:42.631223457Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N","level":"medium"}],"updated_at":"2026-11-02T16:57:44.071534Z"}]}}