Critical Security Flaw in vim Packages: Arbitrary Command Execution Risk
Summary
ALSA-2026:11389: Important: vim security update. Affects vim-X11 versions < 2:9.1.083-6.el10_1.4. Fixed in 2:9.1.083-6.el10_1.4. How to fix ↓
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Background
Vim (Vi IMproved) is a highly popular text editor that enhances the traditional vi editor with additional features and improvements. It is widely used for programming and text editing due to its powerful functionalities, including syntax highlighting, multi-level undo, and extensive plugin support. However, a recent vulnerability has been identified that allows arbitrary command execution through a modeline sandbox bypass, posing significant security risks to users.
Vulnerability Detail
The vulnerability, identified as CVE-2026-34982, allows attackers to execute arbitrary commands by exploiting a bypass in the modeline sandbox feature of Vim. This flaw originates from improper validation of modeline settings, which can be manipulated to execute malicious commands. The ramifications of this vulnerability are severe, as it can lead to unauthorized access, data breaches, and potential system compromise, especially in environments where Vim is used to edit sensitive files.
How To Fix
Minimum fixed version
2:9.1.083-6.el10_1.4
This is the first release that contains the fix.
sudo dnf update vim-X11Tip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
As a temporary workaround, users are advised to disable modelines in Vim by adding the following line to their .vimrc configuration file: 'set nomodeline'. This will prevent the execution of potentially harmful commands through modelines until the package is updated.
Conclusion
The identified vulnerability in Vim poses a significant risk to users, allowing for arbitrary command execution through modeline sandbox bypass. It is crucial to update to the latest patched version to safeguard against potential exploits. Users should also consider disabling modelines as a temporary measure until they can apply the update.
See every vulnerability recorded for vim-X11 →
FAQ
CVE-2026-34982 is a security vulnerability in Vim that allows arbitrary command execution via a modeline sandbox bypass.
You can check your Vim version by running 'vim --version' in the terminal. If it is older than 2:9.1.083-6.el10_1.4, it is affected.
Modelines are special lines in a file that allow users to set Vim options for that specific file. They can be a potential security risk if not properly validated.
Yes, you can use Vulert, which monitors and alerts for open-source vulnerabilities in your software using a manifest file like package-lock.json. You can check your application for vulnerabilities without signup at Vulert Playground.
If you cannot update Vim right away, it is recommended to disable modelines as a temporary workaround to mitigate the risk of arbitrary command execution.
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