Results of a search for the standard model Higgs boson produced in association with a top quark pair in final states with $\tau$ leptons are presented. The analyzed dataset corresponds to an integrated luminosity of 35.9~\mathrm{fb}^{-1} which has been recorded in proton-proton collisions at \sqrt{s} = 13~\mathrm{TeV} center-of-mass energy by the CMS experiment during LHC \mathrm{Run}~2. The sensitivity of the search is improved by using matrix element and machine learning methods to separate the signal from backgrounds. The measured signal rate amounts to $0.72^{+0.62}_{-0.53}$ times the production rate expected in the standard model, with an observed (expected) significance of $1.4\sigma$ ($1.8\sigma$). An upper limit on the signal rate of $2.0$ the standard model production rate is set at the $95\%$ confidence level.

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