In Eclipse OpenJ9, prior to the 0.12.0 release, the jio_snprintf() and jio_vsnprintf() native methods ignored the length parameter. This affects existing APIs that called the functions to exceed the allocated buffer. This functions were not directly callable by non-native user code.
https://access.redhat.com/errata/RHSA-2019:0469
https://access.redhat.com/errata/RHSA-2019:0472
https://access.redhat.com/errata/RHSA-2019:0473
https://access.redhat.com/errata/RHSA-2019:0474