There are currently no open bugs.

"mpfr4" versions published in Ubuntu

Kinetic (4.1.0-3build3): main/math
Jammy (4.1.0-3build3): main/math
Focal (4.0.2-1): main/math
Bionic (4.0.1-1): main/math
Xenial (3.1.4-1): main/math
Trusty (3.1.2-1): main/math