Integer overflow in src/backend/executor/nodeHash.c in PostgreSQL 8.4.1 and earlier, and 8.5 through 8.5alpha2, allows remote authenticated users to cause a denial of service (daemon crash) via a SELECT statement with many LEFT JOIN clauses, related to certain hashtable size calculations.
Exploitability
AV:NAC:MAu:SImpact
C:NI:NA:P3.5/AV:N/AC:M/Au:S/C:N/I:N/A:P