{"id":"RLSA-2026:27738","summary":"Important: libpq security update","details":"The libpq package provides the PostgreSQL client library, which allows client programs to connect to PostgreSQL servers. \n\nSecurity Fix(es):\n\n* postgresql: PostgreSQL: Operating system account hijack via symlink following in pg_basebackup and pg_rewind (CVE-2026-6475)\n\n* postgresql: PostgreSQL libpq: Buffer overflow allows server superuser to overwrite client stack memory (CVE-2026-6477)\n\n* postgresql: PostgreSQL: Credential recovery via covert timing channel in MD5 password comparison (CVE-2026-6478)\n\n* postgresql: integer overflow can cause an undersized allocation and an out-of-bounds write (CVE-2026-6473)\n\nFor more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.","modified":"2026-06-24T12:30:04.032490537Z","published":"2026-06-24T12:01:04.194583Z","upstream":["CVE-2026-6473","CVE-2026-6475","CVE-2026-6477","CVE-2026-6478"],"references":[{"type":"ADVISORY","url":"https://errata.rockylinux.org/RLSA-2026:27738"},{"type":"REPORT","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2477439"},{"type":"REPORT","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2477442"},{"type":"REPORT","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2477447"},{"type":"REPORT","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2477448"}],"affected":[{"package":{"name":"libpq","ecosystem":"Rocky Linux:8","purl":"pkg:rpm/rocky-linux/libpq?distro=rocky-linux-8&epoch=0"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0:13.23-2.el8_10"}],"database_specific":{"yum_repository":"AppStream"}}],"database_specific":{"source":"https://storage.googleapis.com/resf-osv-data/RLSA-2026:27738.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"}],"credits":[{"name":"Rocky Enterprise Software Foundation"},{"name":"Red Hat"}]}