{"id":"CVE-2026-6477","state":"PUBLISHED","title":"PostgreSQL libpq lo_* functions let server superuser overwrite client stack memory","description":"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.","publishedAt":"2026-05-14T13:00:12.497Z","updatedAt":"2026-08-25T12:05:44.549Z","severity":{"score":8.8,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","source":"PostgreSQL"},"assigner":"PostgreSQL","products":["n/a PostgreSQL"],"affected":[{"vendor":"n/a","product":"PostgreSQL","defaultStatus":"unaffected","versions":[{"version":"18","status":"affected","lessThan":"18.4","versionType":"rpm"},{"version":"17","status":"affected","lessThan":"17.10","versionType":"rpm"},{"version":"16","status":"affected","lessThan":"16.14","versionType":"rpm"},{"version":"15","status":"affected","lessThan":"15.18","versionType":"rpm"},{"version":"0","status":"affected","lessThan":"14.23","versionType":"rpm"}]}],"references":["https://www.postgresql.org/support/security/CVE-2026-6477/","https://access.redhat.com/security/cve/CVE-2026-6477","https://bugzilla.redhat.com/show_bug.cgi?id=2477442","https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-6477.json","https://access.redhat.com/errata/RHSA-2026:49521","https://access.redhat.com/errata/RHSA-2026:50863","https://access.redhat.com/errata/RHSA-2026:27718","https://access.redhat.com/errata/RHSA-2026:44391","https://access.redhat.com/errata/RHSA-2026:27743","https://access.redhat.com/errata/RHSA-2026:27742","https://access.redhat.com/errata/RHSA-2026:27738","https://access.redhat.com/errata/RHSA-2026:28999","https://access.redhat.com/errata/RHSA-2026:28208","https://access.redhat.com/errata/RHSA-2026:26181","https://access.redhat.com/errata/RHSA-2026:28143","https://access.redhat.com/errata/RHSA-2026:44420","https://access.redhat.com/errata/RHSA-2026:34362","https://access.redhat.com/errata/RHSA-2026:34363","https://access.redhat.com/errata/RHSA-2026:47090","https://access.redhat.com/errata/RHSA-2026:29815","https://access.redhat.com/errata/RHSA-2026:32994","https://access.redhat.com/errata/RHSA-2026:35880","https://access.redhat.com/errata/RHSA-2026:34043","https://access.redhat.com/errata/RHSA-2026:42555","https://access.redhat.com/errata/RHSA-2026:26561","https://access.redhat.com/errata/RHSA-2026:49908","https://access.redhat.com/errata/RHSA-2026:33497","https://access.redhat.com/errata/RHSA-2026:29953","https://access.redhat.com/errata/RHSA-2026:49909","https://access.redhat.com/errata/RHSA-2026:33441","https://access.redhat.com/errata/RHSA-2026:26524","https://access.redhat.com/errata/RHSA-2026:29904","https://access.redhat.com/errata/RHSA-2026:50779","https://access.redhat.com/errata/RHSA-2026:32983","https://access.redhat.com/errata/RHSA-2026:26525","https://access.redhat.com/errata/RHSA-2026:29212","https://access.redhat.com/errata/RHSA-2026:44308","https://access.redhat.com/errata/RHSA-2026:28037","https://access.redhat.com/errata/RHSA-2026:26203","https://access.redhat.com/errata/RHSA-2026:26204","https://access.redhat.com/errata/RHSA-2026:27741","https://access.redhat.com/errata/RHSA-2026:54760","https://access.redhat.com/errata/RHSA-2026:21182","https://access.redhat.com/errata/RHSA-2026:22878","https://access.redhat.com/errata/RHSA-2026:44481","https://access.redhat.com/errata/RHSA-2026:58981"],"weaknesses":["CWE-242","CWE-120"],"ingestedAt":"2026-10-29T20:12:49.727Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/6xxx/CVE-2026-6477.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-6477","state":"PUBLISHED","datePublished":"2026-05-14T13:00:12.497Z","dateUpdated":"2026-08-25T12:05:44.549Z","assignerShortName":"PostgreSQL","assignerOrgId":"f86ef6dc-4d3a-42ad-8f28-e6d5547a5007","dateReserved":"2026-04-17T00:44:19.965Z"},"containers":{"cna":{"title":"PostgreSQL libpq lo_* functions let server superuser overwrite client stack memory","descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"n/a","product":"PostgreSQL","defaultStatus":"unaffected","versions":[{"version":"18","status":"affected","lessThan":"18.4","versionType":"rpm"},{"version":"17","status":"affected","lessThan":"17.10","versionType":"rpm"},{"version":"16","status":"affected","lessThan":"16.14","versionType":"rpm"},{"version":"15","status":"affected","lessThan":"15.18","versionType":"rpm"},{"version":"0","status":"affected","lessThan":"14.23","versionType":"rpm"}]}],"references":[{"url":"https://www.postgresql.org/support/security/CVE-2026-6477/"}],"metrics":[{"format":"CVSS","cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","baseScore":8.8,"baseSeverity":"HIGH"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-242","lang":"en","type":"CWE","description":"Use of Inherently Dangerous Function"}]}],"providerMetadata":{"shortName":"PostgreSQL","orgId":"f86ef6dc-4d3a-42ad-8f28-e6d5547a5007","dateUpdated":"2026-05-14T13:00:12.497Z"},"workarounds":[{"lang":"en","value":"use PQexecPrepared(), not PQfn(..., result_is_int=0, ...) or its lo_* wrappers"}],"credits":[{"lang":"en","value":"The PostgreSQL project thanks Yu Kunpeng and Martin Heistermann for reporting this problem."}]},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-05-14T00:00:00+00:00","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"total"}],"role":"CISA Coordinator","version":"2.0.3","id":"CVE-2026-6477"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-05-15T03:56:18.668Z"}},{"title":"postgresql: PostgreSQL libpq: Buffer overflow allows server superuser to overwrite client stack memory","descriptions":[{"lang":"en","value":"A flaw was found in PostgreSQL libpq. A server superuser can exploit a buffer overflow vulnerability in the PQfn function, which is used by client functions such as lo_export(), lo_read(), lo_lseek64(), and lo_tell64(). This allows the superuser to send an arbitrarily large response, overwriting the client's stack memory, specifically in tools like psql and pg_dump. This could lead to arbitrary code execution on the client system."}],"affected":[{"vendor":"Red Hat","product":"Red Hat Enterprise Linux 10","packageName":"postgresql18","defaultStatus":"affected","versions":[{"version":"0:18.4-1.el10_2","status":"unaffected","lessThan":"*","versionType":"rpm"}],"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/o:redhat:enterprise_linux:10.2"]},{"vendor":"Red Hat","product":"Red Hat Enterprise Linux 10","packageName":"postgresql16","defaultStatus":"affected","versions":[{"version":"0:16.14-1.el10_2","status":"unaffected","lessThan":"*","versionType":"rpm"}],"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/o:redhat:enterprise_linux:10.2"]},{"vendor":"Red Hat","product":"Red Hat Enterprise Linux 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