{"id":"JLSEC-2026-604","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.","modified":"2026-07-25T18:24:42.840268249Z","published":"2026-06-08T13:54:13.679Z","upstream":["CVE-2026-6477"],"database_specific":{"sources":[{"database_specific":{"status":"Modified"},"id":"CVE-2026-6477","imported":"2026-07-17T22:13:52.369Z","modified":"2026-07-17T13:19:01.047Z","published":"2026-05-14T14:16:25.347Z","url":"https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-6477","html_url":"https://nvd.nist.gov/vuln/detail/CVE-2026-6477"}],"license":"CC-BY-4.0"},"references":[{"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-2026:28143"},{"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-2026:29212"},{"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/errata/RHSA-2026:35880"},{"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://www.postgresql.org/support/security/CVE-2026-6477/"}],"affected":[{"package":{"name":"LibPQ_jll","ecosystem":"Julia","purl":"pkg:julia/LibPQ_jll?uuid=08be9ffa-1c94-5ee5-a977-46a84ec9b350"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"16.14.0+0"}]}],"database_specific":{"source":"https://github.com/JuliaLang/SecurityAdvisories.jl/tree/generated/osv/2026/JLSEC-2026-604.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H"}]}