{"affected":[{"defaultStatus":"affected","ecosystem":"https://access.redhat.com/downloads/content/package-browser/","packageName":"flatpak","product":"Red Hat Enterprise Linux 10","source":"CNA: redhat","vendor":"Red Hat","versions":[]},{"defaultStatus":"affected","ecosystem":"https://access.redhat.com/downloads/content/package-browser/","packageName":"flatpak","product":"Red Hat Enterprise Linux 7","source":"CNA: redhat","vendor":"Red Hat","versions":[]},{"defaultStatus":"affected","ecosystem":"https://access.redhat.com/downloads/content/package-browser/","packageName":"flatpak","product":"Red Hat Enterprise Linux 8","source":"CNA: redhat","vendor":"Red Hat","versions":[]},{"defaultStatus":"affected","ecosystem":"https://access.redhat.com/downloads/content/package-browser/","packageName":"flatpak","product":"Red Hat Enterprise Linux 9","source":"CNA: redhat","vendor":"Red Hat","versions":[]}],"cveId":"CVE-2026-97026","cwes":["CWE-378"],"description":"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 installing apps or runtimes, potentially causing installation failures (denial of service); tampered content would fail signature/digest verification rather than being trusted.","epss":{"date":"2026-11-06","percentile":0.01045,"score":0.00104},"exploits":[],"kev":null,"metrics":[{"score":3.9,"severity":"low","source":"CNA: redhat","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:L/I:N/A:L","version":"3.1"}],"modifiedAt":1793995285676,"publishedAt":1790629023702,"references":[{"source":"CNA: redhat","tags":["vdb-entry","x_refsource_REDHAT"],"url":"https://access.redhat.com/security/cve/CVE-2026-97026"},{"source":"CNA: redhat","tags":["issue-tracking","x_refsource_REDHAT"],"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2542637"},{"source":"CNA: redhat","tags":[],"url":"https://github.com/flatpak/flatpak/security/advisories/GHSA-r9w3-qx54-qvc8"}],"remediation":[{"kind":"workaround","source":"CNA: redhat","text":"Set a umask that does not allow other users to write to the cache directory, for example: umask 022.\n\nNote that a umask that does not allow read/exec access by all (for example 027 or 077) will prevent the flatpak-system-helper from reading the temporary directory directly, resulting in falling back to copying the repository inefficiently, with a warning."}],"revision":"4c50c85ba5a6f2f5a8b7204676a08d001e052eb486eb81e3d6990cd9a89ef7e6","sources":[{"modifiedAt":1793995285676,"name":"CNA: redhat","retrievedAt":1793999395722,"url":"https://www.cve.org/CVERecord?id=CVE-2026-97026"},{"modifiedAt":null,"name":"FIRST EPSS","retrievedAt":1793999397409,"url":"https://api.first.org/data/v1/epss?cve=CVE-2026-97026"}],"ssvc":{"assessedAt":1790797332533,"automatable":"no","exploitation":"none","source":"ADP: CISA-ADP","technicalImpact":"partial"},"status":"published","title":"Flatpak: flatpak: world-writable temporary child repositories in system-helper cache path","updatedAt":1793999397409}