CVE-2026-59857: Out-of-bounds Write

Vim is an open source, command line text editor. Prior to 9.2.0725, the single-byte branch of spellsoundfoldsal in src/spell.c translates a word through a spell file's SAL sound-folding rules into a caller-owned result buffer, but its result writes are guarded with reslen MAXWLEN, allowing reslen...