{"id":"CVE-2026-97026","title":"Flatpak creates temporary child repository directories under the user cache with world-writable permissions (0777)","summary":"Flatpak creates temporary child repository directories under the user cache with world-writable permissions (0777). On multi-user systems with a permissive umask, other local users could read or modify the temporary directory used while …","severity":"low","cvss":3.9,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:L/I:N/A:L","cwe":["CWE-378"],"vendor":"Red Hat","product":"flatpak","affected":["flatpak (all versions)","flatpak (all versions)","flatpak (all versions)","flatpak (all versions)"],"published":"2026-09-28","updated":"2026-09-30","sourceUpdated":"2026-09-30T21:17:19.057","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-97026","references":[{"url":"https://access.redhat.com/security/cve/CVE-2026-97026","label":"secalert@redhat.com"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2542637","label":"secalert@redhat.com"},{"url":"https://github.com/flatpak/flatpak/security/advisories/GHSA-r9w3-qx54-qvc8","label":"secalert@redhat.com"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-97026.json"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-97026"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-97026"}],"tags":["nvd","cve.org","csaf","vex","red-hat"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-09-30T19:42:12.533797Z"},"epss":0.00104,"epssPercentile":0.01029,"ingestedAt":"2026-09-28T21:20:54.788Z","slug":"CVE-2026-97026","body":"## Overview\n\nFlatpak creates temporary child repository directories under the user cache with world-writable permissions (0777). On multi-user systems with a permissive umask, other local users could read or modify the temporary directory used while installing apps or runtimes, potentially causing installation failures (denial of service); tampered content would fail signature/digest verification rather than being trusted.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Low · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9 · no fix planned: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9 · updated 2026-09-28 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-97026.json)","depth":"sunlit","depthScore":21,"depthScoreParts":{"impact":21.5,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}