SB2026062215 - Out-of-bounds write in Vim

Description

This security bulletin contains information about 1 vulnerability.

1) Out-of-bounds write (CVE-ID: N/A)

CWE-ID: CWE-787 - Out-of-bounds write

CVSSv4: CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear

The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to out-of-bounds write in the single-byte branch of spell_soundfold_sofo() in src/spell.c when processing an over-long word through SOFO sound-folding. A local user can supply a specially crafted over-long word to cause a denial of service.

The vulnerable path is only reached under a non-multibyte 8-bit encoding such as latin1, with spell checking enabled for a language that uses a SOFO sound-folding table.

Remediation

Install update from vendor's website.

References

• https://github.com/vim/vim/security/advisories/GHSA-q8mh-6qm3-25g4
• https://github.com/vim/vim/commit/497f931f85339d175d7f69588dd249e8ccfed41b