{"id":"BIT-postgresql-2026-6477","summary":"PostgreSQL libpq lo_* functions let server superuser overwrite client stack memory","details":"Use of inherently dangerous function PQfn(..., result_is_int=0, ...) in PostgreSQL libpq lo_export(), lo_read(), lo_lseek64(), and lo_tell64() functions allows the server superuser to overwrite a client stack buffer with an arbitrarily-large response.  Like gets(), PQfn(..., result_is_int=0, ...) stores arbitrary-length, server-determined data into a buffer of unspecified size.  Because both the \\lo_export command in psql and pg_dump call lo_read(), the server superuser can overwrite pg_dump or psql stack memory.  Versions before PostgreSQL 18.4, 17.10, 16.14, 15.18, and 14.23 are affected.","aliases":["CVE-2026-6477"],"modified":"2026-08-17T08:01:50.029128467Z","published":"2026-05-18T05:53:04.801Z","database_specific":{"severity":"High","cpes":["cpe:2.3:a:postgresql:postgresql:*:*:*:*:*:*:*:*"]},"references":[{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-6477"},{"type":"WEB","url":"https://www.postgresql.org/support/security/CVE-2026-6477/"},{"type":"WEB","url":"https://access.redhat.com/errata/RHSA-2026:21182"},{"type":"WEB","url":"https://access.redhat.com/errata/RHSA-2026:22878"},{"type":"WEB","url":"https://access.redhat.com/errata/RHSA-2026:26181"},{"type":"WEB","url":"https://access.redhat.com/errata/RHSA-2026:26203"},{"type":"WEB","url":"https://access.redhat.com/errata/RHSA-2026:26204"},{"type":"WEB","url":"https://access.redhat.com/errata/RHSA-2026:26524"},{"type":"WEB","url":"https://access.redhat.com/errata/RHSA-2026:26525"},{"type":"WEB","url":"https://access.redhat.com/errata/RHSA-2026:26561"},{"type":"WEB","url":"https://access.redhat.com/errata/RHSA-2026:27718"},{"type":"WEB","url":"https://access.redhat.com/errata/RHSA-2026:27738"},{"type":"WEB","url":"https://access.redhat.com/errata/RHSA-2026:27741"},{"type":"WEB","url":"https://access.redhat.com/errata/RHSA-2026:27742"},{"type":"WEB","url":"https://access.redhat.com/errata/RHSA-2026:27743"},{"type":"WEB","url":"https://access.redhat.com/errata/RHSA-2026:28037"},{"type":"WEB","url":"https://access.redhat.com/errata/RHSA-2026:29212"},{"type":"WEB","url":"https://access.redhat.com/errata/RHSA-2026:29815"},{"type":"WEB","url":"https://access.redhat.com/errata/RHSA-2026:29904"},{"type":"WEB","url":"https://access.redhat.com/errata/RHSA-2026:29953"},{"type":"WEB","url":"https://access.redhat.com/errata/RHSA-2026:32983"},{"type":"WEB","url":"https://access.redhat.com/errata/RHSA-2026:32994"},{"type":"WEB","url":"https://access.redhat.com/errata/RHSA-2026:33441"},{"type":"WEB","url":"https://access.redhat.com/errata/RHSA-2026:33497"},{"type":"WEB","url":"https://access.redhat.com/errata/RHSA-2026:34043"},{"type":"WEB","url":"https://access.redhat.com/errata/RHSA-2026:34362"},{"type":"WEB","url":"https://access.redhat.com/errata/RHSA-2026:34363"},{"type":"WEB","url":"https://access.redhat.com/security/cve/CVE-2026-6477"},{"type":"WEB","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2477442"},{"type":"WEB","url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-6477.json"},{"type":"WEB","url":"https://access.redhat.com/errata/RHSA-2026:35880"},{"type":"WEB","url":"https://access.redhat.com/errata/RHSA-2026:28143"},{"type":"WEB","url":"https://access.redhat.com/errata/RHSA-2026:28208"},{"type":"WEB","url":"https://access.redhat.com/errata/RHSA-2026:28999"},{"type":"WEB","url":"https://access.redhat.com/errata/RHSA-2026:42555"},{"type":"WEB","url":"https://access.redhat.com/errata/RHSA-2026:44308"},{"type":"WEB","url":"https://access.redhat.com/errata/RHSA-2026:44391"},{"type":"WEB","url":"https://access.redhat.com/errata/RHSA-2026:44420"},{"type":"WEB","url":"https://access.redhat.com/errata/RHSA-2026:44481"},{"type":"WEB","url":"https://access.redhat.com/errata/RHSA-2026:47090"},{"type":"WEB","url":"https://access.redhat.com/errata/RHSA-2026:49521"},{"type":"WEB","url":"https://access.redhat.com/errata/RHSA-2026:49908"},{"type":"WEB","url":"https://access.redhat.com/errata/RHSA-2026:49909"},{"type":"WEB","url":"https://access.redhat.com/errata/RHSA-2026:50779"},{"type":"WEB","url":"https://access.redhat.com/errata/RHSA-2026:50863"},{"type":"WEB","url":"https://access.redhat.com/errata/RHSA-2026:54760"}],"affected":[{"package":{"name":"postgresql","ecosystem":"Bitnami","purl":"pkg:bitnami/postgresql"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"14.23.0"},{"introduced":"15.0.0"},{"fixed":"15.18.0"},{"introduced":"16.0.0"},{"fixed":"16.14.0"},{"introduced":"17.0.0"},{"fixed":"17.10.0"},{"introduced":"18.0.0"},{"fixed":"18.4.0"}]}],"database_specific":{"source":"https://github.com/bitnami/vulndb/tree/main/data/postgresql/BIT-postgresql-2026-6477.json"},"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H"}]}],"schema_version":"1.9.0"}