{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-6668", "assignerOrgId": "f86ef6dc-4d3a-42ad-8f28-e6d5547a5007", "state": "PUBLISHED", "assignerShortName": "PostgreSQL", "dateReserved": "2026-04-20T12:25:46.351Z", "datePublished": "2026-09-23T16:04:47.158Z", "dateUpdated": "2026-09-23T16:46:13.834Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "f86ef6dc-4d3a-42ad-8f28-e6d5547a5007", "shortName": "PostgreSQL", "dateUpdated": "2026-09-23T16:04:47.158Z"}, "title": "Integer overflow causes an infinite loop in packet buffer growth in PgBouncer", "descriptions": [{"lang": "en", "value": "Integer overflow in the packet buffer growth logic in PgBouncer through 1.25.2 allows an unauthenticated remote attacker to cause a denial of service. Sufficiently large input makes the buffer size computation overflow, leaving the growth loop unable to terminate. Because PgBouncer serves all clients from a single process, this saturates a CPU core and stalls every pooled connection until the process is killed. Both unauthenticated and authenticated code paths can reach the overflow."}], "affected": [{"defaultStatus": "unaffected", "product": "PgBouncer", "vendor": "n/a", "versions": [{"version": "0", "lessThanOrEqual": "1.25.2", "versionType": "semver", "status": "affected"}]}], "problemTypes": [{"descriptions": [{"lang": "en", "cweId": "CWE-190", "type": "CWE", "description": "Integer Overflow or Wraparound"}]}, {"descriptions": [{"lang": "en", "cweId": "CWE-835", "type": "CWE", "description": "Loop with Unreachable Exit Condition ('Infinite Loop')"}]}], "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:N/UI:N/S:U/C:N/I:N/A:H", "baseScore": 7.5, "baseSeverity": "HIGH"}}], "configurations": [{"lang": "en", "value": "max_packet_size is left at its default of 2147483647 (default configuration), which is what permits a packet large enough to reach the overflow. No other non-default configuration is required."}], "workarounds": [{"lang": "en", "value": "Set max_packet_size well below 1073741824 so that no single packet can grow a packet buffer past the overflow threshold"}], "credits": [{"lang": "en", "value": "Thanks to @var77 for finding and reporting this issue.", "type": "finder"}]}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-6668", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-09-23T16:33:22.320321Z"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-09-23T16:46:13.834Z"}}]}}

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