{"id":"CVE-2026-6475","year":2026,"sequence":6475,"component":"client","score":8.8,"cvss_version":"3.0","vector":"AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","first_published":"2026-05-14","source_url":"https://www.postgresql.org/support/security/CVE-2026-6475/","facts":{"affected":{"14":"14","15":"15","16":"16","17":"17","18":"18"},"affected_ranges":[{"from":"0","until":"14.23"},{"from":"15","until":"15.18"},{"from":"16","until":"16.14"},{"from":"17","until":"17.10"},{"from":"18","until":"18.4"}],"cna_url":"https://cveawg.mitre.org/api/cve/CVE-2026-6475","component":"client","cvss_version":"3.0","description_en":"Symlink following in PostgreSQL pg_basebackup plain format and in pg_rewind allows an origin superuser to overwrite local files, e.g. /var/lib/postgres/.bashrc, that hijack the operating system account. It will remain the case that starting the server after these commands implicitly trusts the origin superuser, due to features like shared_preload_libraries. Hence, the attack has practical implications only if one takes relevant action between these commands and server start, like moving the files to a different VM or snapshotting the VM. 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