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CVE-2026-55693— Vim: Out-of-bounds Write in Spell File Word Count

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 9.2.0653之前版本存在缓冲区错误漏洞，该漏洞源于tree_count_words()函数在src/spellfile.c中未检查深度计数器与固定栈数组边界，导致堆栈越界写入，可能使攻击者通过特制.spl/.sug文件对编辑器造成崩溃。

AI Predicted 5.5 Difficulty: Hard EPSS 0.12% · P2

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 1

VendorProduct Version RangeStatus
vim vim < 9.2.0653 affected
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I. Basic Information for CVE-2026-55693

Vulnerability Information
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Vulnerability Title
Vim: Out-of-bounds Write in Spell File Word Count
Source: CVE Program / CVE List V5
Vulnerability Description
Vim is an open source, command line text editor. Prior to 9.2.0653, the tree_count_words() function in src/spellfile.c fills in the word-count fields of a spell-file word trie by walking it iteratively with a depth counter. The counter is bounded only by the trie structure itself; it is never checked against the size of the fixed MAXWLEN-element stack arrays it indexes (arridx[], curi[], wordcount[]). A crafted .spl/.sug file pair, loaded when the user invokes spell suggestion, can drive the descent arbitrarily deep, so the function writes past the end of those arrays. This is a stack out-of-bounds write that corrupts the call frame and crashes the editor. This vulnerability is fixed in 9.2.0653.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:L/AC:L/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 9.2.0653之前版本存在缓冲区错误漏洞，该漏洞源于tree_count_words()函数在src/spellfile.c中未检查深度计数器与固定栈数组边界，导致堆栈越界写入，可能使攻击者通过特制.spl/.sug文件对编辑器造成崩溃。
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 < 9.2.0653 -

II. Public POCs for CVE-2026-55693

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III. Intelligence Information for CVE-2026-55693

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Patches & Fixes for CVE-2026-55693 (2)

Vendor Advisories for CVE-2026-55693 (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-2026-57455 Vim: Stack out-of-bounds write in `spell_soundfold_sofo()` via an over-length `soundfold()
CVE-2026-57454 Vim: Out-of-bounds Read with Text Properties
CVE-2026-55895 Vim: Vimscript Code Injection in netrw NetrwLocalRmFile() via crafted filename

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-55693

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