CVE-2026-55693
HighCVSS 7.8Exploitation Probability (EPSS)
Low risk3th percentile - higher than 3% of all known CVEs
Summary
In Vim prior to version 9.2.0653, the tree_count_words() function in src/spellfile.c writes out-of-bounds on the stack when processing crafted .spl/.sug files. An attacker can exploit this vulnerability to crash the editor via stack buffer overflow.
Risk Assessment
The risk involves potential remote code execution or denial-of-service (DoS) when a user opens a malicious dictionary file. This vulnerability could be exploited for DoS attacks or potentially privilege escalation.
Recommendation
Immediately update Vim to version 9.2.0653 or later. In the meantime, avoid opening untrusted .spl/.sug files and disable the spell suggestion feature in the editor configuration.
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Original NVD description (English source)
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.