CVE-2026-55693

Vim is an open source, command line text editor. Prior to 9.2.0653, the tree_count_words() function in src/spellfile.c fills in the word-count fields of a spell-file word trie by walking it iteratively with a depth counter. The counter is bounded only by the trie structure itself; it is never checked against the size of the fixed MAXWLEN-element stack arrays it indexes (arridx[], curi[], wordcount[]). A crafted .spl/.sug file pair, loaded when the user invokes spell suggestion, can drive the descent arbitrarily deep, so the function writes past the end of those arrays. This is a stack out-of-bounds write that corrupts the call frame and crashes the editor. This vulnerability is fixed in 9.2.0653.

• vim 2:9.2.0782-1 (bug https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1140775) https://github.com/vim/vim/security/advisories/GHSA-wgh4-64f7-q3jq Fixed by: https://github.com/vim/vim/commit/a80874d9b84a01040e3d1aef2d4a59e1934dafb7 (v9.2.0653)