{"id":"ALSA-2026:27742","summary":"Important: postgresql18 security update","details":"PostgreSQL is an advanced Object-Relational database management system (DBMS). The base postgresql package contains the client programs that you'll need to access a PostgreSQL DBMS server, as well as HTML documentation for the whole system. These client programs can be located on the same machine as the PostgreSQL server, or on a remote machine that accesses a PostgreSQL server over a network connection. The PostgreSQL server can be found in the postgresql-server sub-package.  \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  * postgresql: PostgreSQL libpq: Buffer overflow allows server superuser to overwrite client stack memory (CVE-2026-6477)\n  * postgresql: PostgreSQL: Credential recovery via covert timing channel in MD5 password comparison (CVE-2026-6478)\n  * postgresql: integer overflow can cause an undersized allocation and an out-of-bounds write (CVE-2026-6473)\n\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.\n","modified":"2026-08-12T12:27:02.861025954Z","published":"2026-06-22T00:00:00Z","related":["CVE-2026-6473","CVE-2026-6475","CVE-2026-6477","CVE-2026-6478"],"references":[{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:27742"},{"type":"REPORT","url":"https://access.redhat.com/security/cve/CVE-2026-6473"},{"type":"REPORT","url":"https://access.redhat.com/security/cve/CVE-2026-6475"},{"type":"REPORT","url":"https://access.redhat.com/security/cve/CVE-2026-6477"},{"type":"REPORT","url":"https://access.redhat.com/security/cve/CVE-2026-6478"},{"type":"REPORT","url":"https://bugzilla.redhat.com/2477439"},{"type":"REPORT","url":"https://bugzilla.redhat.com/2477442"},{"type":"REPORT","url":"https://bugzilla.redhat.com/2477447"},{"type":"REPORT","url":"https://bugzilla.redhat.com/2477448"},{"type":"ADVISORY","url":"https://errata.almalinux.org/10/ALSA-2026-27742.html"}],"affected":[{"package":{"name":"postgresql18","ecosystem":"AlmaLinux:10","purl":"pkg:rpm/almalinux/postgresql18"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"18.4-1.el10_2"}]}],"database_specific":{"source":"https://github.com/AlmaLinux/osv-database/blob/master/advisories/almalinux10/ALSA-2026:27742.json"}},{"package":{"name":"postgresql18-contrib","ecosystem":"AlmaLinux:10","purl":"pkg:rpm/almalinux/postgresql18-contrib"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"18.4-1.el10_2"}]}],"database_specific":{"source":"https://github.com/AlmaLinux/osv-database/blob/master/advisories/almalinux10/ALSA-2026:27742.json"}},{"package":{"name":"postgresql18-docs","ecosystem":"AlmaLinux:10","purl":"pkg:rpm/almalinux/postgresql18-docs"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"18.4-1.el10_2"}]}],"database_specific":{"source":"https://github.com/AlmaLinux/osv-database/blob/master/advisories/almalinux10/ALSA-2026:27742.json"}},{"package":{"name":"postgresql18-plperl","ecosystem":"AlmaLinux:10","purl":"pkg:rpm/almalinux/postgresql18-plperl"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"18.4-1.el10_2"}]}],"database_specific":{"source":"https://github.com/AlmaLinux/osv-database/blob/master/advisories/almalinux10/ALSA-2026:27742.json"}},{"package":{"name":"postgresql18-plpython3","ecosystem":"AlmaLinux:10","purl":"pkg:rpm/almalinux/postgresql18-plpython3"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"18.4-1.el10_2"}]}],"database_specific":{"source":"https://github.com/AlmaLinux/osv-database/blob/master/advisories/almalinux10/ALSA-2026:27742.json"}},{"package":{"name":"postgresql18-private-devel","ecosystem":"AlmaLinux:10","purl":"pkg:rpm/almalinux/postgresql18-private-devel"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"18.4-1.el10_2"}]}],"database_specific":{"source":"https://github.com/AlmaLinux/osv-database/blob/master/advisories/almalinux10/ALSA-2026:27742.json"}},{"package":{"name":"postgresql18-private-libs","ecosystem":"AlmaLinux:10","purl":"pkg:rpm/almalinux/postgresql18-private-libs"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"18.4-1.el10_2"}]}],"database_specific":{"source":"https://github.com/AlmaLinux/osv-database/blob/master/advisories/almalinux10/ALSA-2026:27742.json"}},{"package":{"name":"postgresql18-server","ecosystem":"AlmaLinux:10","purl":"pkg:rpm/almalinux/postgresql18-server"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"18.4-1.el10_2"}]}],"database_specific":{"source":"https://github.com/AlmaLinux/osv-database/blob/master/advisories/almalinux10/ALSA-2026:27742.json"}},{"package":{"name":"postgresql18-server-devel","ecosystem":"AlmaLinux:10","purl":"pkg:rpm/almalinux/postgresql18-server-devel"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"18.4-1.el10_2"}]}],"database_specific":{"source":"https://github.com/AlmaLinux/osv-database/blob/master/advisories/almalinux10/ALSA-2026:27742.json"}},{"package":{"name":"postgresql18-static","ecosystem":"AlmaLinux:10","purl":"pkg:rpm/almalinux/postgresql18-static"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"18.4-1.el10_2"}]}],"database_specific":{"source":"https://github.com/AlmaLinux/osv-database/blob/master/advisories/almalinux10/ALSA-2026:27742.json"}},{"package":{"name":"postgresql18-test","ecosystem":"AlmaLinux:10","purl":"pkg:rpm/almalinux/postgresql18-test"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"18.4-1.el10_2"}]}],"database_specific":{"source":"https://github.com/AlmaLinux/osv-database/blob/master/advisories/almalinux10/ALSA-2026:27742.json"}},{"package":{"name":"postgresql18-test-rpm-macros","ecosystem":"AlmaLinux:10","purl":"pkg:rpm/almalinux/postgresql18-test-rpm-macros"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"18.4-1.el10_2"}]}],"database_specific":{"source":"https://github.com/AlmaLinux/osv-database/blob/master/advisories/almalinux10/ALSA-2026:27742.json"}},{"package"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