Abstract We present the analysis of a microlensing event KMT-2022-BLG-0086 of which the overall light curve is not described by a binary-lens single-source (2L1S) model, which suggests the existence of an extra lens or an extra source. We found that the event is best explained by the binary-lens binary-source (2L2S) model, but the 2L2S model is only favored over the triple-lens single-source (3L1S) model by Δχ 2 ≃ 9. Although the event has noticeable anomalies around the peak of the light curve, they are not enough covered to constrain the angular Einstein radius θ E, thus we only measure the minimum angular Einstein radius θ E , min . From the Bayesian analysis, it is found that that the binary lens system is a binary star with masses of ( m 1 , m 2 ) = ( 0.4 6 − 0.25 + 0.35 M ⊙ , 0.7 5 − 0.55 + 0.67 M ⊙ ) at a distance of D L = 5.8 7 − 1.79 + 1.21 kpc, while the triple lens system is a brown dwarf or a massive giant planet in a low-mass binary-star system with masses of ( m 1 , m 2 , m 3 ) = ( 0.4 3 − 0.35 + 0.41 M ⊙ , 0.05 6 − 0.047 + 0.055 M ⊙ , 20.8 4 − 17.04 + 20.20 M J ) at a distance of D L = 4.0 6 − 3.28 + 1.39 kpc, indicating a disk lens system. The 2L2S model yields the relative lens-source proper motion of μ rel ≥ 4.6 mas yr−1 that is consistent with the Bayesian result, whereas the 3L1S model yields μ rel ≥ 18.9 mas yr−1, which is more than three times larger than that of a typical disk object of ∼6 mas yr−1 and thus is not consistent with the Bayesian result. This suggests that the event is likely caused by the binary-lens binary-source model.