CVE-2026-123976: EDFbrowser before 2.16 Out-of-Bounds Write via check_edf_file() Annotation Signals

EDFbrowser before 2.16 contains an out-of-bounds write vulnerability in checkedffile() that allows attackers to overflow the 256-element annotch array by supplying excessive annotation signals. Attackers can craft an EDF+ or BDF+ file with more than 256 annotation signals to overwrite edfhdrblock members, including the signal parameter pointer, crashing the application when opened.