Unintentionally Uttering Words Of Kufr While Reciting the Quraan-e-Majeed

Unintentionally/accidentally reciting the Holy Qur’an incorrectly whether in or out of Salaah will not render a person a Kaafir.

However, reciting a word incorrectly to such an effect that it portrays a meaning converse to the meaning intended (as is the case in the example that you cited) will cause the Salaah to break and that particular Salaah will have to be repeated. In the case where a person is an Imaam and he is corrected by the Muqtadees (those following him), then too the Salaah will break and will have to be repeated.

The same ruling will not apply if the mistake then subsequent correction has to occur in Taraweeh Salaah, since completion of the Qur’an is the objective and in so doing, mistakes are common.