| Algorithmic complexity vulnerability in the regular expression parser
in TCL before 8.4.17, as used in PostgreSQL 8.2 before 8.2.6, 8.1
before 8.1.11, 8.0 before 8.0.15, and 7.4 before 7.4.19, allows remote
authenticated users to cause a denial of service (memory consumption)
via a crafted "complex" regular expression with doubly-nested states.
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