CVE-2026-57455
HighCVSS 7.8Exploitation Probability (EPSS)
Low risk2th percentile - higher than 2% of all known CVEs
Summary
In Vim before version 9.2.0698, the spell_soundfold_sofo() function in src/spell.c has a stack out-of-bounds write vulnerability. The copy loop does not check the bounds of the result buffer, allowing data to be written past the allocated stack memory when processing a word longer than MAXWLEN. This corrupts the call frame and crashes the editor.
Risk Assessment
An attacker can crash the Vim editor by providing a long word while a SOFO-based spell language is active, potentially leading to denial of service (DoS) or arbitrary code execution.
Recommendation
Immediately update Vim to version 9.2.0698 or later, which contains the fix for this vulnerability.
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Original NVD description (English source)
Vim is an open source, command line text editor. Prior to 9.2.0698, the single-byte branch of spell_soundfold_sofo() in src/spell.c translates a word through a spell file's SOFO (sound-folding) byte map into a caller-owned result buffer. Its copy loop advances the output index ri with no upper bound and terminates only on the input NUL, writing one byte per input byte into the MAXWLEN-element stack buffer the caller provides. A word longer than MAXWLEN, passed to soundfold() (or reached via sound-based spell suggestion) while a SOFO-based spell language is active, therefore writes past the end of that buffer. This is a stack out-of-bounds write that corrupts the call frame and crashes the editor. This vulnerability is fixed in 9.2.0698.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS