{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-107350", "assignerOrgId": "f86ef6dc-4d3a-42ad-8f28-e6d5547a5007", "state": "PUBLISHED", "assignerShortName": "PostgreSQL", "dateReserved": "2026-10-07T19:13:32.963Z", "datePublished": "2026-10-14T17:34:39.009Z", "dateUpdated": "2026-10-14T17:34:39.009Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "f86ef6dc-4d3a-42ad-8f28-e6d5547a5007", "shortName": "PostgreSQL", "dateUpdated": "2026-10-14T17:34:39.009Z"}, "title": "Authentication bypass via second StartupMessage during SCRAM authentication in PgBouncer", "descriptions": [{"lang": "en", "value": "Improper authentication in PgBouncer 1.17.0 through 1.26.0 allows a remote attacker who knows the password of a user listed in auth_file to log in as any other user that authenticates using SCRAM, including PgBouncer admin users and backend superusers. A second StartupMessage sent during SCRAM authentication against a non-existent database is not rejected and switches the user being logged in as, while the SCRAM exchange is still verified against the keys of the first user."}], "affected": [{"defaultStatus": "unaffected", "product": "PgBouncer", "vendor": "n/a", "versions": [{"version": "1.17.0", "lessThan": "1.26.1", "versionType": "semver", "status": "affected"}]}], "problemTypes": [{"descriptions": [{"lang": "en", "cweId": "CWE-287", "type": "CWE", "description": "Improper Authentication"}]}], "references": [{"url": "https://www.pgbouncer.org/changelog.html"}], "metrics": [{"format": "CVSS", "cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 8.8, "baseSeverity": "HIGH"}}], "configurations": [{"lang": "en", "value": "The attacker knows the password of a user that has its password stored in auth_file, and SCRAM authentication is used for both that user and the impersonated user (auth_type = scram-sha-256, auth_type = md5 with SCRAM secrets, or matching hba rules). The impersonated user can be loaded from either auth_file or auth_query."}], "credits": [{"lang": "en", "value": "Thanks to Dave Aitel (@daveaitel-openai, OpenAI) for finding and reporting this issue.", "type": "finder"}]}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "PgBouncer", "vendor": "n/a", "versions": [{"lessThan": "1.26.1", "status": "affected", "version": "1.17.0", "versionType": "semver"}]}], "source": "f86ef6dc-4d3a-42ad-8f28-e6d5547a5007"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Improper authentication in PgBouncer 1.17.0 through 1.26.0 allows a remote attacker who knows the password of a user listed in auth_file to log in as any other user that authenticates using SCRAM, including PgBouncer admin users and backend superusers. A second StartupMessage sent during SCRAM authentication against a non-existent database is not rejected and switches the user being logged in as, while the SCRAM exchange is still verified against the keys of the first user."}], "id": "CVE-2026-107350", "lastModified": "2026-10-14T18:17:25.670", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/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": "2026-10-14T18:17:25.670", "references": [{"source": "f86ef6dc-4d3a-42ad-8f28-e6d5547a5007", "url": "https://www.pgbouncer.org/changelog.html"}], "sourceIdentifier": "f86ef6dc-4d3a-42ad-8f28-e6d5547a5007", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-287"}], "source": "f86ef6dc-4d3a-42ad-8f28-e6d5547a5007", "type": "Secondary"}]}

{}

{"created": "2026-10-14T21:15:07.388557+00:00", "updated": "2026-10-14T21:15:07.388563+00:00", "vendors": []}