CVE-2026-6477

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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": "Red Hat Enterprise Linux 10", "vendor": "Red Hat", "versions": 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Avoid using psql or pg_dump against untrusted or potentially compromised database servers."}], "x_generator": {"engine": "sadp-cli 1.0.0"}, "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."}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-120", "description": "Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')"}]}], "providerMetadata": {"orgId": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "shortName": "redhat-SADP", "dateUpdated": "2026-08-25T12:05:44.549Z"}}, {"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-6477", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-05-14T15:32:22.657353Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-05-14T15:32:25.888Z"}}], "cna": {"title": "PostgreSQL libpq lo_* functions let server superuser overwrite client stack memory", "credits": [{"lang": "en", "value": "The PostgreSQL project thanks Yu Kunpeng and Martin Heistermann for reporting this problem."}], "metrics": [{"format": "CVSS", "cvssV3_1": {"version": "3.1", "baseScore": 8.8, "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H"}}], "affected": [{"vendor": "n/a", "product": "PostgreSQL", "versions": [{"status": "affected", "version": "18", "lessThan": "18.4", "versionType": "rpm"}, {"status": "affected", "version": "17", "lessThan": "17.10", "versionType": "rpm"}, {"status": "affected", "version": "16", "lessThan": "16.14", "versionType": "rpm"}, {"status": "affected", "version": "15", "lessThan": "15.18", "versionType": "rpm"}, {"status": "affected", "version": "0", "lessThan": "14.23", "versionType": "rpm"}], "defaultStatus": "unaffected"}], "references": [{"url": "https://www.postgresql.org/support/security/CVE-2026-6477/"}], "workarounds": [{"lang": "en", "value": "use PQexecPrepared(), not PQfn(..., result_is_int=0, ...) or its lo_* wrappers"}], "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."}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-242", "description": "Use of Inherently Dangerous Function"}]}], "providerMetadata": {"orgId": "f86ef6dc-4d3a-42ad-8f28-e6d5547a5007", "shortName": "PostgreSQL", "dateUpdated": "2026-05-14T13:00:12.497Z"}}}, "cveMetadata": {"cveId": "CVE-2026-6477", "state": "PUBLISHED", "dateUpdated": "2026-08-25T12:05:44.549Z", "dateReserved": "2026-04-17T00:44:19.965Z", "assignerOrgId": "f86ef6dc-4d3a-42ad-8f28-e6d5547a5007", "datePublished": "2026-05-14T13:00:12.497Z", "assignerShortName": "PostgreSQL"}, "dataVersion": "5.2"}

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Debido a que tanto el comando \\lo_export en psql como pg_dump llaman a lo_read(), el superusuario del servidor puede sobrescribir la memoria de pila de pg_dump o psql. Las versiones anteriores a PostgreSQL 18.4, 17.10, 16.14, 15.18 y 14.23 est\u00e1n afectadas."}], "id": "CVE-2026-6477", "lastModified": "2026-11-11T20:10:00.273", "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"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.4, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "HIGH", "scope": "CHANGED", "userInteraction": "REQUIRED", "vectorString": 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{"bugzilla": {"description": "postgresql: PostgreSQL libpq: Buffer overflow allows server superuser to overwrite client stack memory", "id": "2477442", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2477442"}, "csaw": false, "cvss3": {"cvss3_base_score": "8.4", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-120", "details": ["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."], "mitigation": {"lang": "en:us", "value": "Only connect to trusted PostgreSQL servers. Avoid using psql or pg_dump against untrusted or potentially compromised database servers."}, "name": "CVE-2026-6477", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "postgresql16", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "postgresql18", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "postgresql", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "postgresql", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "libpq", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "postgresql", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "postgresql-jdbc", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "postgresql", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "postgresql:15/postgresql", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "postgresql:16/postgresql", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "postgresql:18/postgresql", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:hummingbird:1", "fix_state": "Not affected", "package_name": "postgresql17", "product_name": "Red Hat Hardened Images"}, {"cpe": "cpe:/a:redhat:hummingbird:1", "fix_state": "Affected", "package_name": "postgresql18", "product_name": "Red Hat Hardened Images"}], "public_date": "2026-05-14T13:00:12Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-6477\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-6477\nhttps://www.postgresql.org/support/security/CVE-2026-6477/"], "statement": "This IMPORTANT buffer overflow in PostgreSQL libpq allows a malicious server superuser to overwrite client stack memory via lo_* functions. Exploitation requires the victim to connect to a compromised or malicious server (UI:R). The scope is changed as the server attack affects the client system. Impact is high to confidentiality, integrity, and availability through potential client-side code execution. Affects versions before 18.4, 17.10, 16.14, 15.18, and 14.23.", "threat_severity": "Important"}

{"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": "2026-06-04T02:15:03.399573+00:00", "vendors": ["postgresql", "postgresql$PRODUCT$postgresql"]}