{"id":"UBUNTU-CVE-2026-52791","details":"fuse-overlayfs is an implementation of overlayfs in FUSE for rootless containers. Prior to 1.17, the release-1.x C branch preserves SUID and SGID mode bits in main.c during open(O_TRUNC) and truncate handling on a copied-up file, allowing a low-privileged process to leave the upper-layer file with mode 4777. This issue is fixed in version 1.17.","modified":"2026-08-06T03:09:40.289540666Z","published":"2026-07-29T17:16:00Z","upstream":["CVE-2026-52791"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-52791"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-52791"},{"type":"REPORT","url":"https://github.com/containers/fuse-overlayfs/security/advisories/GHSA-2cc4-p72c-v85h"}],"affected":[{"package":{"name":"fuse-overlayfs","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/fuse-overlayfs?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.3-1","0.7-1","0.7.2-1","0.7.3-1","0.7.4-1","0.7.5-1","0.7.6-1"],"ecosystem_specific":{"binaries":[{"binary_name":"fuse-overlayfs","binary_version":"0.7.6-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-52791.json"}},{"package":{"name":"fuse-overlayfs","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/fuse-overlayfs?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.4.0-1","1.7.1-1"],"ecosystem_specific":{"binaries":[{"binary_name":"fuse-overlayfs","binary_version":"1.7.1-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-52791.json"}},{"package":{"name":"fuse-overlayfs","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/fuse-overlayfs?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.10-1","1.13-1"],"ecosystem_specific":{"binaries":[{"binary_name":"fuse-overlayfs","binary_version":"1.13-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-52791.json"}},{"package":{"name":"fuse-overlayfs","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/fuse-overlayfs?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.14-1build1","1.14-1build2"],"ecosystem_specific":{"binaries":[{"binary_name":"fuse-overlayfs","binary_version":"1.14-1build2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-52791.json"}}],"schema_version":"1.8.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N"},{"type":"Ubuntu","score":"medium"}]}