{"id":"CVE-2026-64825","aliases":["GHSA-5hxg-r395-fqxx","PYSEC-2026-3669"],"url":"https://o3.security/vulnerability/CVE-2026-64825","summary":"Home Assistant Core < 2026.6.0 Path Traversal File Write via Backup Upload","details":"Home Assistant Core before 2026.6.0 contains a path traversal vulnerability that allows unauthenticated attackers to write arbitrary files to any directory on the host filesystem by uploading a crafted backup archive during the initial onboarding window. Attackers can manipulate the 'name' field inside the uploaded archive's backup.json to supply an absolute path, causing pathlib.Path.__truediv__ to discard the configured backup directory prefix and write attacker-controlled content to arbitrary locations, with full filesystem access when the process runs as root.","published":"2026-07-21T15:40:18.756Z","modified":"2026-08-19T12:55:43.937931247Z","cvss":null,"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"PyPI","name":"homeassistant","fixedVersion":"2026.6.0"}],"fix":{"url":"https://github.com/home-assistant/core/commit/567fe858289876b68b8162a77bd46e1e1af79752","label":"home-assistant/core@567fe85"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64825.json"},{"type":"ADVISORY","url":"https://github.com/home-assistant/core/releases/tag/2026.6.0"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-64825"},{"type":"ADVISORY","url":"https://www.vulncheck.com/advisories/home-assistant-core-path-traversal-file-write-via-backup-upload"},{"type":"REPORT","url":"https://github.com/home-assistant/core/pull/172368"},{"type":"FIX","url":"https://github.com/home-assistant/core/commit/567fe858289876b68b8162a77bd46e1e1af79752"},{"type":"PACKAGE","url":"https://github.com/home-assistant/core"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-19T12:55:43.937931247Z"}}