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CVE-2026-57455— Vim: Stack out-of-bounds write in `spell_soundfold_sofo()` via an over-length `soundfold()` argument

Quick assessment

Affected
vim vim
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Vim是Vim组织开源的一款跨平台的文本编辑器。 Vim 9.2.0698之前版本存在缓冲区错误漏洞，该漏洞源于spell_soundfold_sofo()函数中存在栈越界写入问题，可能导致编辑器崩溃。

AI Predicted 5.5 Difficulty: Moderate EPSS 0.12% · P2

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 1

VendorProduct Version RangeStatus
vim vim < 9.2.0698 affected
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I. Basic Information for CVE-2026-57455

Vulnerability Information
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Vulnerability Title
Vim: Stack out-of-bounds write in `spell_soundfold_sofo()` via an over-length `soundfold()` argument
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:L/AC:H/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存写
Source: CVE Program / CVE List V5
Vulnerability Title
Vim 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Vim是Vim组织开源的一款跨平台的文本编辑器。 Vim 9.2.0698之前版本存在缓冲区错误漏洞，该漏洞源于spell_soundfold_sofo()函数中存在栈越界写入问题，可能导致编辑器崩溃。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
vim vim < 9.2.0698 -

II. Public POCs for CVE-2026-57455

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III. Intelligence Information for CVE-2026-57455

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Patches & Fixes for CVE-2026-57455 (1)

Vendor Advisories for CVE-2026-57455 (1)

Vendor Pages for CVE-2026-57455 (1)

Same Patch Batch · vim · 2026-06-25 · 9 CVEs total

CVE-2026-57453 6.5 MEDIUM Vim: PowerShell Command Injection via Unescaped Filename in zip.vim Extraction
CVE-2026-57452 5.5 MEDIUM Vim: Out-of-bounds Read with libsodium-encrypted Files
CVE-2026-55892 5.5 MEDIUM Vim: Out-of-bounds Write in Spell File Prefix Dump
CVE-2026-57451 5.3 MEDIUM Vim: Out-of-bounds Read in Text Property Count
CVE-2026-57456 Vim: Arbitrary Code Execution via Python Omni-Completion Docstrings
CVE-2026-57454 Vim: Out-of-bounds Read with Text Properties
CVE-2026-55895 Vim: Vimscript Code Injection in netrw NetrwLocalRmFile() via crafted filename
CVE-2026-55693 Vim: Out-of-bounds Write in Spell File Word Count

IV. Related Vulnerabilities

Same product: vim
Same vendor: vim
Same weakness: CWE-787

V. Comments for CVE-2026-57455

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