{ "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": "2026-08-25T12:05:44.549Z" }, "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": [ { "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "cpes": [ "cpe:/o:redhat:enterprise_linux:10.2" ], "defaultStatus": "affected", "packageName": "postgresql18", "product": 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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": [ 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"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": "2026-08-25T12:05:44.549Z" } } ] } }