Stack-based buffer overflow in the *printf function implementations in PostgreSQL before 9.0.19 9.1.x before 9.1.15 9.2.x before 9.2.10 9.3.x before 9.3.6 and 9.4.x before 9.4.1 when running on a Windows system allows remote authenticated users to cause a denial of service (crash) and possibly execute arbitrary code via a floating point number with a large precision as demonstrated by using the to_char function.