{"id":"CVE-2026-96276","title":"If a malicious SDK container declares an extension point with a crafted `directory` path, and a developer runs `flatpak build-init --writable-sdk --sdk-extension` with that SDK, attacker-chosen files could be written outside the working …","summary":"If a malicious SDK container declares an extension point with a crafted `directory` path, and a developer runs `flatpak build-init --writable-sdk --sdk-extension` with that SDK, attacker-chosen files could be written outside the working …","severity":"critical","cvss":9.8,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","cwe":["CWE-22"],"vendor":"Red Hat","product":"flatpak","affected":["flatpak","flatpak","flatpak","flatpak"],"published":"2026-09-23","updated":"2026-09-23","sourceUpdated":"2026-09-23T16:16:49.337","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-96276","references":[{"url":"https://access.redhat.com/security/cve/CVE-2026-96276","label":"secalert@redhat.com"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2539418","label":"secalert@redhat.com"},{"url":"https://github.com/flatpak/flatpak/security/advisories/GHSA-8qxj-x646-phcm","label":"secalert@redhat.com"}],"tags":["nvd","cve.org"],"ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"total","timestamp":"2026-09-23T15:28:10.393280Z"},"ingestedAt":"2026-09-23T15:26:23.424Z","slug":"CVE-2026-96276","body":"## Overview\n\nIf a malicious SDK container declares an extension point with a crafted `directory` path, and a developer runs `flatpak build-init --writable-sdk --sdk-extension` with that SDK, attacker-chosen files could be written outside the working directory, since the target path is resolved via a function that allows `..` traversal.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"midnight","depthScore":54,"depthScoreParts":{"impact":53.9,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":209779,"id":"CVE-2026-96276","ts":1790180881576,"field":"cvss","old":null,"new":"9.8"},{"seq":209778,"id":"CVE-2026-96276","ts":1790180881576,"field":"severity","old":"none","new":"critical"}]}