CVE-2022-1898 in vim
Summary
by MITRE • 05/27/2022
Use After Free in GitHub repository vim/vim prior to 8.2.
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Analysis
by VulDB Data Team • 04/12/2026
The vulnerability identified as CVE-2022-1898 represents a critical use-after-free condition within the vim text editor repository prior to version 8.2. This flaw occurs when the software attempts to access memory that has already been freed, creating a potential vector for arbitrary code execution. The issue stems from improper memory management during specific operations within the vim editor's codebase, where allocated memory blocks are deallocated but subsequent references to these locations persist. Such memory corruption vulnerabilities are particularly dangerous as they can be exploited to execute malicious code with the privileges of the affected application.
The technical implementation of this use-after-free vulnerability involves scenarios where vim processes certain file operations or command executions that trigger memory allocation followed by premature deallocation without proper nullification of pointers. When the application subsequently attempts to access these freed memory locations, it may read corrupted data or overwrite adjacent memory regions. This behavior aligns with CWE-416, which specifically addresses use-after-free conditions in software development. The vulnerability manifests during normal vim operation when processing specific input patterns or file formats that cause the editor to allocate memory for buffer operations and then release it before all references are properly cleared.
The operational impact of CVE-2022-1898 extends beyond simple memory corruption, as it provides potential attackers with pathways to achieve remote code execution on systems running vulnerable versions of vim. Attackers could craft malicious input files or exploit web-based interfaces that utilize vim for text processing to trigger the vulnerability. The implications are particularly severe in server environments where vim is used for automated text processing or in development environments where editors handle untrusted input. This vulnerability directly maps to ATT&CK technique T1059.007 for Command and Scripting Interpreter, as exploitation could enable attackers to execute arbitrary commands through the compromised vim process. The attack surface includes any environment where vim is installed and used for processing potentially malicious content.
Mitigation strategies for CVE-2022-1898 primarily involve immediate patching of affected vim installations to version 8.2 or later, which contains the necessary memory management fixes. System administrators should also implement additional protective measures such as restricting vim execution in privileged contexts and employing sandboxing techniques for text processing operations. Input validation and sanitization should be enforced when vim processes untrusted content, while regular security audits should verify that no outdated versions remain in production environments. The fix typically involves implementing proper pointer nullification after memory deallocation and adding additional checks to prevent access to freed memory regions. Organizations should also consider deploying automated patch management systems to ensure timely updates across all affected systems, as this vulnerability could be exploited in zero-day scenarios where attackers may have already developed working exploits.