CVE-2026-59857

Summary

Vim is an open source, command line text editor. Prior to 9.2.0725, the single-byte branch of spell_soundfold_sal() 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 to reach MAXWLEN before res[reslen] = NUL writes one byte past the end of the MAXWLEN-element stack buffer. A boundary-length word passed to soundfold(), or reached via sound-based spell suggestion while a SAL-based spell language is active under a non-multibyte 8-bit encoding, can corrupt the eval_soundfold() stack frame and crash the editor. This issue is fixed in version 9.2.0725.

Affected Software

Weaknesses

• CWE-787: CWE-787: Out-of-bounds Write

References

• https://github.com/vim/vim/security/advisories/GHSA-m3hf-xcm3-xhm2
• https://github.com/vim/vim/commit/d22ff1c955ff87e8273210eae125aab0e85b6c30

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