{"id":"CVE-2026-107348","revision":"044910f208074e42a11f22d0c9ad3d21","records":[{"revision":"044910f208074e42a11f22d0c9ad3d21","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-107348","aliases":[],"title":"Integer overflow causes an infinite loop in message buffer growth in PgBouncer","description":"Integer overflow in the message buffer growth logic (mbuf_make_room) in PgBouncer 1.21.0 through 1.26.0 allows a remote attacker to cause a denial of service when max_packet_size is configured above 2147483648. A packet header declaring a length above 2^31 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 restarted. Since 1.23.0 the overflow is reachable before authentication with a five-byte packet header.","state":0,"publishedAt":"2026-10-14T17:34:29.838+00:00","modifiedAt":"2026-10-16T20:11:22.132+00:00","affected":[{"ecosystem":"Vendor product","name":"PgBouncer","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"defaultStatus\": \"unaffected\",\n                    \"product\": \"PgBouncer\",\n                    \"vendor\": \"n/a\",\n                    \"versions\": [\n                        {\n                            \"version\": \"1.21.0\",\n                            \"lessThan\": \"1.26.1\",\n                            \"versionType\": \"semver\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","score":5.9,"severity":"MEDIUM"}],"references":["https://www.pgbouncer.org/changelog.html"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-107348","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-107348","identifiers":["CVE-2026-107348"]},"retained":false,"historicalAffected":[]}],"coverage":[]}