CVE-2022-2126 in vim
Summary
by MITRE • 06/19/2022
Out-of-bounds Read in GitHub repository vim/vim prior to 8.2.
If you want to get the best quality for vulnerability data then you always have to consider VulDB.
Analysis
by VulDB Data Team • 05/24/2026
The vulnerability identified as CVE-2022-2126 represents a critical out-of-bounds read flaw discovered in the popular vim text editor repository maintained by GitHub. This issue affects versions of vim prior to 8.2, making it a significant concern for users who have not updated their installations. The vulnerability stems from improper bounds checking during specific operations within the editor's codebase, creating a potential attack vector that could be exploited by malicious actors. The flaw manifests when the software attempts to access memory locations beyond the allocated buffer boundaries, which can lead to unpredictable behavior and system instability.
Technical exploitation of this out-of-bounds read vulnerability occurs through crafted input that triggers the vulnerable code path within vim's processing logic. When the editor encounters specific patterns or sequences in text files, it fails to properly validate array indices or memory access boundaries before performing read operations. This type of flaw falls under the CWE-125 vulnerability category, which specifically addresses out-of-bounds read conditions in software implementations. The vulnerability is particularly dangerous because it can be triggered through normal text editing operations, making it difficult to predict and prevent without proper input validation. Attackers could potentially craft malicious input files or commands that would cause vim to access invalid memory locations, potentially leading to information disclosure, denial of service, or even remote code execution depending on the system configuration and memory layout.
The operational impact of CVE-2022-2126 extends beyond simple system crashes or data corruption. Organizations relying on vim for system administration, development work, or text processing tasks face significant risk from this vulnerability. When exploited, the out-of-bounds read could expose sensitive memory contents, potentially revealing system information, user credentials, or other confidential data stored in memory. The vulnerability is particularly concerning in environments where vim is used with untrusted input or in automated processes where input validation may be insufficient. Security researchers have noted that such memory safety issues often serve as stepping stones for more sophisticated attacks, as they can be combined with other vulnerabilities or used to gain additional system information. The ATT&CK framework categorizes this type of vulnerability under the T1059.007 technique for 'Command and Scripting Interpreter: Unix Shell' when exploited in automated contexts, highlighting the potential for escalation through shell-based attacks.
Mitigation strategies for CVE-2022-2126 primarily focus on immediate software updates to version 8.2 or later, which includes patches specifically designed to address the out-of-bounds read condition. System administrators should prioritize patching all affected vim installations across their infrastructure, particularly in environments where vim is used for critical operations or with untrusted input sources. Additionally, implementing input validation measures and sandboxing techniques can help reduce the attack surface for this vulnerability. Organizations should also consider monitoring for suspicious vim usage patterns or unusual memory access behaviors that might indicate exploitation attempts. The vulnerability demonstrates the importance of regular security updates and proper code review processes, particularly for widely-used system utilities that handle user input. Security teams should integrate this vulnerability into their vulnerability management workflows and ensure that all system components using vim are regularly updated to prevent potential exploitation. Proper access controls and privilege separation can also help limit the impact if exploitation does occur, as the vulnerability may require elevated privileges to fully leverage its potential consequences.