What’s Vulnerable › Vulnerabilities

CVE-2026-59857: Vim: Out-of-bounds Write in SAL Soundfolding

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-07-09 · updated 2026-07-10
• Weakness: CWE-787

Description

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 products

• vim/vim: before 9.2.0725 — fixed in 9.2.0725

How to fix

Upgrade to a fixed version: vim/vim 9.2.0725. Check the vendor advisory for mitigations.

References

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

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