Today, we'll discuss a crucial vulnerability (CVE-2023-26143) found in earlier versions of the package blamer prior to 1..4. For software developers and other individuals using the vulnerable versions, this poses an imminent security threat, which could allow attackers to inject arbitrary arguments and compromise system security as well as user data. In the following sections, we will analyze the issue in-depth, offer a comprehensive explanation of the exploit along with a code snippet, and provide links to original references.


Package blamer is a popular npm package used for parsing git-blame output. However, versions of this package before 1..4 contain a significant vulnerability called Arbitrary Argument Injection. This vulnerability originates from the blameByFile() API not properly sanitizing user input or validating the given file path, thereby allowing an attacker to inject arbitrary arguments and execute malicious commands with potentially disastrous consequences. Moreover, the package fails to pass command-line flags to the git binary using the double-dash POSIX characters (--), which is necessary to indicate the end of options and prevent further argument injection.

Imagine an attacker ingesting a malicious file in the following way

blamer.blameByFile(--global core.editor "touch exploit.js" && git config --global, file, function(err, data) {
    // Code goes here

In this example, an attacker manipulates user-supplied data and injects arbitrary arguments such as touching a malicious file (


) and making changes to the global git configuration. Due to the lack of input sanitization and validation, this could lead to unauthorized access, modification of sensitive system configurations, or even execution of arbitrary code.

To mitigate the impact of CVE-2023-26143, developers using the package blamer should

1. Update their package to version 1..4 or later, which contains the necessary patches for input sanitization and validation mechanisms.

For more information about this vulnerability, please refer to the following resources

1. CVE-2023-26143 Record:
2. Official Package Blamer Documentation:
3. Security Best Practices for Using npm Packages:


As we can see, the vulnerability CVE-2023-26143 in blamer versions prior to 1..4 has serious implications. Arbitrary Argument Injection poses significant risks and could lead to unauthorized access or alteration of critical system configurations as well as the execution of arbitrary code. By raising awareness and taking necessary precautions, developers and users can fend off potential exploitation and work toward maintaining the security of their codebases, systems, and personal information.


Published on: 09/19/2023 05:17:00 UTC
Last modified on: 09/21/2023 19:28:00 UTC