  A study of excited $\Lambda_\mathrm{b}^0$ baryons is reported, based on a
data sample collected in 2016-2018 with the CMS detector at the LHC in
proton-proton collisions at a center-of-mass energy of 13 TeV, corresponding to
an integrated luminosity of up to 140 fb$^{-1}$. The existence of four excited
$\Lambda_\mathrm{b}^0$ states: $\Lambda_\mathrm{b}$(5912)$^0$,
$\Lambda_\mathrm{b}$(5920)$^0$, $\Lambda_\mathrm{b}$(6146)$^0$, and
$\Lambda_\mathrm{b}$(6152)$^0$ in the $\Lambda_\mathrm{b}^0\pi^+\pi^-$ mass
spectrum is confirmed, and their masses are measured. The
$\Lambda_\mathrm{b}^0\pi^+\pi^-$ mass distribution exhibits a broad excess of
events in the region of 6040-6100 MeV, whose origin cannot be discerned with
the present data.
