🛡️ CVE-2026-55892 on Ubuntu — vim

⚪ Unknown ✅ No Known Exploit OSV

N/A

CVSS Score

0 Low4 Medium7 High9 Critical10

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.

Distribution advisory

This page covers CVE-2026-55892 as tracked by Ubuntu, for the package vim. The fix is available in version 2:9.1.2141-1ubuntu4.6; earlier versions remain affected.

How this vulnerability can be exploited

This issue can be reached with local access to the system, attack complexity is low, an attacker needs no privileges on the target. A user must be tricked into taking some action. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality none, integrity none, availability high.

Weakness class

UBUNTU-CVE-2026-55892 is classified as CWE-787: Out-of-bounds Write. Data is written past the end or before the start of a buffer, corrupting whatever is stored there.

Affected software

UBUNTU-CVE-2026-55892 is recorded against 1 package.

vim (fixed in 2:9.1.2141-1ubuntu4.6)

Timeline and source

Published on 25 June 2026 and last revised on 2 July 2026. No public exploit is currently recorded for this entry. Record sourced from OSV.

References

ubuntu.com (Report)
www.cve.org (Report)
github.com (Report)
ubuntu.com (Advisory)

Details

Severity Unknown

CVSS Score N/A

CVSS Vector CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

CWE N/A

Public Exploit ✅ No

Source OSV

Published 2026-06-25

Updated 2026-08-12

Modified 2026-07-02

Fix URL N/A

Affected Packages

Software	From version	Fixed in
vim	—	2:9.1.2141-1ubuntu4.6

References

REPORT https://ubuntu.com/security/CVE-2026-55892

REPORT https://www.cve.org/CVERecord?id=CVE-2026-55892

REPORT https://github.com/vim/vim/security/advisories/GHSA-qm9w-fmpj-879h

ADVISORY https://ubuntu.com/security/notices/USN-8500-1

🔗 NVD 🔗 Mitre

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