Context. Following its nominal mission, the Hayabusa2 spacecraft is cruising toward two new targets as part of its extended mission, Hayabusa2# (SHARP: Small Hazardous Asteroid Reconnaissance Probe). The spacecraft will fly by the near-Earth asteroid (98943) Torifune in 2026 and rendezvous with another near-Earth asteroid, 1998 KY26, in 2031. 1998 KY26 was at its brightest in 2024 since its discovery in 1998. Aims. This study aims to characterize the surface composition of 1998 KY26 and constrain its origin. Methods. We used the 10.4-meter Gran Telescopio Canarias to obtain a visible reflectance spectrum of 1998 KY26 in May 2024. We analyzed the spectrum for taxonomic classification and compared it with laboratory meteoritic spectra and other E-type asteroids. Results. The spectrum of 1998 KY26 shows an overall positive spectral slope with no clear absorption feature, which turns flat (neutral) at 0.6-0.7 µm and slightly negative toward 0.9 µm. It is taxonomically classified as an Xe-type (Bus-DeMeo) or X-type (Tholen), while the asteroid's high geometric albedo (pV ∼ 0.52) identifies 1998 KY26 as an E-type (Tholen). The spectral shape is consistent with enstatite chondrites (EL/EH). Conclusions. Considering the spectral shape and the high albedo of 1998 KY26, it quite likely originated from the inner main belt rather than the Hungaria region. These results also suggest a possible relationship to asteroids (44) Nysa and (135) Hertha, which may originate from layers of different reduction states in a parent body.