Vim up to 9.2.724 Spell Sound-Folding src/spell.c spell_soundfold_sal stack-based overflow

Summaryinfo

A vulnerability classified as problematic was found in Vim up to 9.2.724. This issue affects the function spell_soundfold_sal of the file src/spell.c of the component Spell Sound-Folding. The manipulation results in stack-based overflow. This vulnerability is known as CVE-2026-59857. Attacking locally is a requirement. No exploit is available.

Detailsinfo

A vulnerability classified as problematic has been found in Vim up to 9.2.724. Affected is the function spell_soundfold_sal of the file src/spell.c of the component Spell Sound-Folding. The manipulation with an unknown input leads to a stack-based overflow vulnerability. CWE is classifying the issue as CWE-121. A stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function). This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is available at github.com. This vulnerability is traded as CVE-2026-59857 since 07/07/2026. The exploitability is told to be easy. Local access is required to approach this attack. Successful exploitation requires user interaction by the victim. Technical details are known, but there is no available exploit.

Upgrading to version 9.2.0725 eliminates this vulnerability.

If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Type

• Word Processing Software

Name

• Vim

Version

• 9.2.724

License

• open-source

Website

• Product: https://github.com/vim/vim/

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