An issue was discovered in Pillow 2.4.0 before 8.2.0. There is an out-of-bounds read in J2kDecode, in j2ku_gray_i.
CWE-125 - Out-of-Bounds Read
Out-of-bounds read is a vulnerability that allows access to memory beyond the authorized accessible location. Such a vulnerability compromises the confidentiality of the trusted environment in the application and enables an attacker to launch further attacks by leveraging the exposed information.