CVE-2026-55892
Vim: Out-of-bounds Write in Spell File Prefix Dump
Description
Vim is an open source, command line text editor. Prior to 9.2.0662, the dump_prefixes() function in src/spell.c walks a spell-file prefix trie iteratively with a depth counter while dumping the prefixes that apply to a word. 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 (prefix[], arridx[], curi[]). A crafted .spl file, loaded when the user dumps the word list, 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 9.2.0662.
INFO
Published Date :
June 25, 2026, 4:16 p.m.
Last Modified :
June 26, 2026, 7:16 p.m.
Remotely Exploit :
No
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | MEDIUM | [email protected] |
Solution
- Update Vim to version 9.2.0662 or later.
- Apply the patch for release 9.2.0662.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-55892.
| URL | Resource |
|---|---|
| https://github.com/vim/vim/commit/8325b193bba5f01e7a7d8241f | Patch |
| https://github.com/vim/vim/releases/tag/v9.2.0662 | Product |
| https://github.com/vim/vim/security/advisories/GHSA-qm9w-fmpj-879h | Vendor Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-55892 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-55892
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-55892 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-55892 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jun. 26, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2026-55892', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'no'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2026-06-26T17:50:52.811086Z'} -
Initial Analysis by [email protected]
Jun. 26, 2026
Action Type Old Value New Value Added CPE Configuration OR *cpe:2.3:a:vim:vim:*:*:*:*:*:*:*:* versions up to (excluding) 9.2.0662 Added Reference Type GitHub, Inc.: https://github.com/vim/vim/commit/8325b193bba5f01e7a7d8241f Types: Patch Added Reference Type GitHub, Inc.: https://github.com/vim/vim/releases/tag/v9.2.0662 Types: Product Added Reference Type GitHub, Inc.: https://github.com/vim/vim/security/advisories/GHSA-qm9w-fmpj-879h Types: Vendor Advisory -
New CVE Received by [email protected]
Jun. 25, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'vim', 'product': 'vim', 'versions': [{'status': 'affected', 'version': '< 9.2.0662'}]}] Added Description Vim is an open source, command line text editor. Prior to 9.2.0662, the dump_prefixes() function in src/spell.c walks a spell-file prefix trie iteratively with a depth counter while dumping the prefixes that apply to a word. 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 (prefix[], arridx[], curi[]). A crafted .spl file, loaded when the user dumps the word list, 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 9.2.0662. Added CVSS V3.1 AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H Added CWE CWE-787 Added Reference https://github.com/vim/vim/commit/8325b193bba5f01e7a7d8241f Added Reference https://github.com/vim/vim/releases/tag/v9.2.0662 Added Reference https://github.com/vim/vim/security/advisories/GHSA-qm9w-fmpj-879h