{"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": "2026-05-14T13:00:12.497Z"}, "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."}]}}}

{}

{"cveTags": [], "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."}], "id": "CVE-2026-6477", "lastModified": "2026-05-14T14:16:25.347", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 5.9, "source": "f86ef6dc-4d3a-42ad-8f28-e6d5547a5007", "type": "Secondary"}]}, "published": "2026-05-14T14:16:25.347", "references": [{"source": "f86ef6dc-4d3a-42ad-8f28-e6d5547a5007", "url": "https://www.postgresql.org/support/security/CVE-2026-6477/"}], "sourceIdentifier": "f86ef6dc-4d3a-42ad-8f28-e6d5547a5007", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-242"}], "source": "f86ef6dc-4d3a-42ad-8f28-e6d5547a5007", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[18,18.4)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[17,17.10)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[16,16.14)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[15,15.18)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[0,14.23)"}}], "enrichment": {"confidence": 80.0, "confidence_source": "inferred", "scores": [{"score": 80.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "PostgreSQL", "source": "cna", "vendor": "n/a"}, "product": "postgresql", "vendor": "postgresql"}], "created": "2026-05-14T14:45:22.146445+00:00", "updated": "2026-05-14T15:00:12.669797+00:00", "vendors": ["postgresql", "postgresql$PRODUCT$postgresql"]}