{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-6477","assignerOrgId":"f86ef6dc-4d3a-42ad-8f28-e6d5547a5007","state":"PUBLISHED","assignerShortName":"PostgreSQL","dateReserved":"2026-04-17T00:44:19.965Z","datePublished":"2026-05-14T13:00:12.497Z","dateUpdated":"2026-07-06T12:04:53.805Z"},"containers":{"cna":{"providerMetadata":{"orgId":"f86ef6dc-4d3a-42ad-8f28-e6d5547a5007","shortName":"PostgreSQL","dateUpdated":"2026-05-14T13:00:12.497Z"},"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":[{"defaultStatus":"unaffected","product":"PostgreSQL","vendor":"n/a","versions":[{"lessThan":"18.4","status":"affected","version":"18","versionType":"rpm"},{"lessThan":"17.10","status":"affected","version":"17","versionType":"rpm"},{"lessThan":"16.14","status":"affected","version":"16","versionType":"rpm"},{"lessThan":"15.18","status":"affected","version":"15","versionType":"rpm"},{"lessThan":"14.23","status":"affected","version":"0","versionType":"rpm"}]}],"problemTypes":[{"descriptions":[{"lang":"en","cweId":"CWE-242","type":"CWE","description":"Use of Inherently Dangerous Function"}]}],"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"}}],"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":[{"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"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-05-15T03:56:18.668Z"}},{"affected":[{"cpes":["cpe:/o:redhat:enterprise_linux_eus:10.0"],"defaultStatus":"affected","product":"Red Hat Enterprise Linux AppStream EUS (v. 10.0)","vendor":"Red Hat"},{"cpes":["cpe:/o:redhat:enterprise_linux:10.2"],"defaultStatus":"affected","product":"Red Hat Enterprise Linux AppStream (v. 10)","vendor":"Red Hat"},{"cpes":["cpe:/a:redhat:enterprise_linux:8::appstream"],"defaultStatus":"affected","product":"Red Hat Enterprise Linux AppStream (v. 8)","vendor":"Red Hat"},{"cpes":["cpe:/a:redhat:rhel_aus:8.4::appstream"],"defaultStatus":"affected","product":"Red Hat Enterprise Linux AppStream AUS (v.8.4)","vendor":"Red Hat"},{"cpes":["cpe:/a:redhat:rhel_eus_long_life:8.4::appstream"],"defaultStatus":"affected","product":"Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4)","vendor":"Red Hat"},{"cpes":["cpe:/a:redhat:rhel_aus:8.6::appstream"],"defaultStatus":"affected","product":"Red Hat Enterprise Linux AppStream AUS (v.8.6)","vendor":"Red Hat"},{"cpes":["cpe:/a:redhat:rhel_eus_long_life:8.6::appstream"],"defaultStatus":"affected","product":"Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.6)","vendor":"Red Hat"},{"cpes":["cpe:/a:redhat:rhel_e4s:8.8::appstream"],"defaultStatus":"affected","product":"Red Hat Enterprise Linux AppStream E4S (v.8.8)","vendor":"Red Hat"},{"cpes":["cpe:/a:redhat:rhel_tus:8.8::appstream"],"defaultStatus":"affected","product":"Red Hat Enterprise Linux AppStream TUS (v.8.8)","vendor":"Red Hat"},{"cpes":["cpe:/a:redhat:rhel_e4s:9.2::appstream"],"defaultStatus":"affected","product":"Red Hat Enterprise Linux AppStream E4S (v.9.2)","vendor":"Red Hat"},{"cpes":["cpe:/a:redhat:rhel_e4s:9.4::appstream"],"defaultStatus":"affected","product":"Red Hat Enterprise Linux AppStream E4S (v.9.4)","vendor":"Red Hat"},{"cpes":["cpe:/a:redhat:rhel_eus:9.6::appstream"],"defaultStatus":"affected","product":"Red Hat Enterprise Linux AppStream EUS (v.9.6)","vendor":"Red Hat"},{"cpes":["cpe:/a:redhat:enterprise_linux:9::appstream"],"defaultStatus":"affected","product":"Red Hat Enterprise Linux AppStream (v. 9)","vendor":"Red Hat"},{"cpes":["cpe:/o:redhat:enterprise_linux_eus:10.0"],"defaultStatus":"affected","product":"Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0)","vendor":"Red Hat"},{"cpes":["cpe:/o:redhat:enterprise_linux:10.2"],"defaultStatus":"affected","product":"Red Hat Enterprise Linux CodeReady Linux Builder (v. 10)","vendor":"Red Hat"},{"cpes":["cpe:/a:redhat:rhel_eus:9.6::crb"],"defaultStatus":"affected","product":"Red Hat CodeReady Linux Builder EUS (v.9.6)","vendor":"Red Hat"},{"cpes":["cpe:/a:redhat:enterprise_linux:9::crb"],"defaultStatus":"affected","product":"Red Hat Enterprise Linux CodeReady Linux Builder (v. 9)","vendor":"Red Hat"},{"cpes":["cpe:/a:redhat:hummingbird:1"],"defaultStatus":"affected","product":"Red Hat Hardened Images","vendor":"Red Hat"},{"cpes":["cpe:/o:redhat:enterprise_linux:10"],"defaultStatus":"affected","product":"Red Hat Enterprise Linux 10","vendor":"Red Hat"},{"cpes":["cpe:/o:redhat:enterprise_linux:6"],"defaultStatus":"affected","product":"Red Hat Enterprise Linux 6","vendor":"Red Hat"},{"cpes":["cpe:/o:redhat:enterprise_linux:7"],"defaultStatus":"affected","product":"Red Hat Enterprise Linux 7","vendor":"Red Hat"},{"cpes":["cpe:/o:redhat:enterprise_linux:8"],"defaultStatus":"affected","product":"Red Hat Enterprise Linux 8","vendor":"Red Hat"},{"cpes":["cpe:/o:redhat:enterprise_linux:9"],"defaultStatus":"affected","product":"Red Hat Enterprise Linux 9","vendor":"Red Hat"},{"cpes":["cpe:/a:redhat:ansible_portal:2"],"defaultStatus":"affected","product":"Self-service automation portal 2","vendor":"Red Hat"}],"datePublic":"2026-05-14T13:00:12.497Z","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."}],"metrics":[{"other":{"content":{"namespace":"https://access.redhat.com/security/updates/classification/","value":"Important"},"type":"Red Hat severity rating"}},{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":8.4,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"HIGH","scope":"CHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:H","version":"3.1"},"format":"CVSS"}],"problemTypes":[{"descriptions":[{"cweId":"CWE-120","description":"Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')","lang":"en","type":"CWE"}]}],"references":[{"tags":["vdb-entry","x_refsource_REDHAT"],"url":"https://access.redhat.com/security/cve/CVE-2026-6477"},{"name":"RHBZ#2477442","tags":["issue-tracking","x_refsource_REDHAT"],"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2477442"},{"tags":["x_sadp-csaf-vex"],"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-6477.json"},{"tags":["vendor-advisory","x_refsource_REDHAT"],"url":"https://access.redhat.com/errata/RHSA-2026:27718"},{"tags":["vendor-advisory","x_refsource_REDHAT"],"url":"https://access.redhat.com/errata/RHSA-2026:27743"},{"tags":["vendor-advisory","x_refsource_REDHAT"],"url":"https://access.redhat.com/errata/RHSA-2026:27742"},{"tags":["vendor-advisory","x_refsource_REDHAT"],"url":"https://access.redhat.com/errata/RHSA-2026:27738"},{"tags":["vendor-advisory","x_refsource_REDHAT"],"url":"https://access.redhat.com/errata/RHSA-2026:26181"},{"tags":["vendor-advisory","x_refsource_REDHAT"],"url":"https://access.redhat.com/errata/RHSA-2026:34362"},{"tags":["vendor-advisory","x_refsource_REDHAT"],"url":"https://access.redhat.com/errata/RHSA-2026:34363"},{"tags":["vendor-advisory","x_refsource_REDHAT"],"url":"https://access.redhat.com/errata/RHSA-2026:29815"},{"tags":["vendor-advisory","x_refsource_REDHAT"],"url":"https://access.redhat.com/errata/RHSA-2026:32994"},{"tags":["vendor-advisory","x_refsource_REDHAT"],"url":"https://access.redhat.com/errata/RHSA-2026:35880"},{"tags":["vendor-advisory","x_refsource_REDHAT"],"url":"https://access.redhat.com/errata/RHSA-2026:34043"},{"tags":["vendor-advisory","x_refsource_REDHAT"],"url":"https://access.redhat.com/errata/RHSA-2026:26561"},{"tags":["vendor-advisory","x_refsource_REDHAT"],"url":"https://access.redhat.com/errata/RHSA-2026:33497"},{"tags":["vendor-advisory","x_refsource_REDHAT"],"url":"https://access.redhat.com/errata/RHSA-2026:29953"},{"tags":["vendor-advisory","x_refsource_REDHAT"],"url":"https://access.redhat.com/errata/RHSA-2026:33441"},{"tags":["vendor-advisory","x_refsource_REDHAT"],"url":"https://access.redhat.com/errata/RHSA-2026:26524"},{"tags":["vendor-advisory","x_refsource_REDHAT"],"url":"https://access.redhat.com/errata/RHSA-2026:29904"},{"tags":["vendor-advisory","x_refsource_REDHAT"],"url":"https://access.redhat.com/errata/RHSA-2026:32983"},{"tags":["vendor-advisory","x_refsource_REDHAT"],"url":"https://access.redhat.com/errata/RHSA-2026:26525"},{"tags":["vendor-advisory","x_refsource_REDHAT"],"url":"https://access.redhat.com/errata/RHSA-2026:29212"},{"tags":["vendor-advisory","x_refsource_REDHAT"],"url":"https://access.redhat.com/errata/RHSA-2026:28037"},{"tags":["vendor-advisory","x_refsource_REDHAT"],"url":"https://access.redhat.com/errata/RHSA-2026:26203"},{"tags":["vendor-advisory","x_refsource_REDHAT"],"url":"https://access.redhat.com/errata/RHSA-2026:26204"},{"tags":["vendor-advisory","x_refsource_REDHAT"],"url":"https://access.redhat.com/errata/RHSA-2026:27741"},{"tags":["vendor-advisory","x_refsource_REDHAT"],"url":"https://access.redhat.com/errata/RHSA-2026:21182"},{"tags":["vendor-advisory","x_refsource_REDHAT"],"url":"https://access.redhat.com/errata/RHSA-2026:22878"}],"solutions":[{"lang":"en","value":"RHSA-2026:27718: Red Hat Enterprise Linux AppStream EUS (v. 10.0), Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0)"},{"lang":"en","value":"RHSA-2026:27743: Red Hat Enterprise Linux AppStream (v. 10), Red Hat Enterprise Linux CodeReady Linux Builder (v. 10)"},{"lang":"en","value":"RHSA-2026:27742: Red Hat Enterprise Linux AppStream (v. 10), Red Hat Enterprise Linux CodeReady Linux Builder (v. 10)"},{"lang":"en","value":"RHSA-2026:27738: Red Hat Enterprise Linux AppStream (v. 8)"},{"lang":"en","value":"RHSA-2026:26181: Red Hat Enterprise Linux AppStream (v. 8)"},{"lang":"en","value":"RHSA-2026:34362: Red Hat Enterprise Linux AppStream AUS (v.8.4), Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4)"},{"lang":"en","value":"RHSA-2026:34363: Red Hat Enterprise Linux AppStream AUS (v.8.4), Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4)"},{"lang":"en","value":"RHSA-2026:29815: Red Hat Enterprise Linux AppStream AUS (v.8.6), Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.6)"},{"lang":"en","value":"RHSA-2026:32994: Red Hat Enterprise Linux AppStream AUS (v.8.6), Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.6)"},{"lang":"en","value":"RHSA-2026:35880: Red Hat Enterprise Linux AppStream E4S (v.8.8), Red Hat Enterprise Linux AppStream TUS (v.8.8)"},{"lang":"en","value":"RHSA-2026:34043: Red Hat Enterprise Linux AppStream E4S (v.8.8), Red Hat Enterprise Linux AppStream TUS (v.8.8)"},{"lang":"en","value":"RHSA-2026:26561: Red Hat Enterprise Linux AppStream E4S (v.8.8), Red Hat Enterprise Linux AppStream TUS (v.8.8)"},{"lang":"en","value":"RHSA-2026:33497: Red Hat Enterprise Linux AppStream E4S (v.9.2)"},{"lang":"en","value":"RHSA-2026:29953: Red Hat Enterprise Linux AppStream E4S (v.9.2)"},{"lang":"en","value":"RHSA-2026:33441: Red Hat Enterprise Linux AppStream E4S (v.9.4)"},{"lang":"en","value":"RHSA-2026:26524: Red Hat Enterprise Linux AppStream E4S (v.9.4)"},{"lang":"en","value":"RHSA-2026:29904: Red Hat Enterprise Linux AppStream E4S (v.9.4)"},{"lang":"en","value":"RHSA-2026:32983: Red Hat Enterprise Linux AppStream EUS (v.9.6)"},{"lang":"en","value":"RHSA-2026:26525: Red Hat Enterprise Linux AppStream EUS (v.9.6)"},{"lang":"en","value":"RHSA-2026:29212: Red Hat CodeReady Linux Builder EUS (v.9.6), Red Hat Enterprise Linux AppStream EUS (v.9.6)"},{"lang":"en","value":"RHSA-2026:28037: Red Hat Enterprise Linux AppStream (v. 9)"},{"lang":"en","value":"RHSA-2026:26203: Red Hat Enterprise Linux AppStream (v. 9)"},{"lang":"en","value":"RHSA-2026:26204: Red Hat Enterprise Linux AppStream (v. 9)"},{"lang":"en","value":"RHSA-2026:27741: Red Hat Enterprise Linux AppStream (v. 9), Red Hat Enterprise Linux CodeReady Linux Builder (v. 9)"},{"lang":"en","value":"RHSA-2026:21182: Red Hat Hardened Images"},{"lang":"en","value":"RHSA-2026:22878: Red Hat Hardened Images"}],"timeline":[{"lang":"en","time":"2026-05-14T14:01:31.087Z","value":"Reported to Red Hat."},{"lang":"en","time":"2026-05-14T13:00:12.497Z","value":"Made public."}],"title":"postgresql: PostgreSQL libpq: Buffer overflow allows server superuser to overwrite client stack memory","workarounds":[{"lang":"en","value":"Only connect to trusted PostgreSQL servers. Avoid using psql or pg_dump against untrusted or potentially compromised database servers."}],"x_adpType":"supplier","x_generator":{"engine":"sadp-cli 1.0.0"},"providerMetadata":{"orgId":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c","shortName":"redhat-SADP","dateUpdated":"2026-07-06T12:04:53.805Z"}}]}}