{"id":"CVE-2026-6637","year":2026,"sequence":6637,"component":"contrib module","score":8.8,"cvss_version":"3.0","vector":"AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","first_published":"2026-05-14","source_url":"https://www.postgresql.org/support/security/CVE-2026-6637/","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-2026-6637","component":"contrib module","cvss_version":"3.0","description_en":"Stack buffer overflow in PostgreSQL module \"refint\" allows an unprivileged database user to execute arbitrary code as the operating system user running the database. A distinct attack is possible if the application declares a user-controlled column as a \"refint\" cascade primary key and facilitates user-controlled updates to that column. In that case, a SQL injection allows a primary key update value provider to execute arbitrary SQL as the database user performing the primary key update. 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