CVE-2026-16631 in publint
Summary
by MITRE • 07/23/2026
A vulnerability was detected in publint up to 0.1.4. This impacts the function child_process.exec of the file src/node/pack.js of the component package-manager Command Handler. The manipulation results in os command injection. Attacking locally is a requirement. The exploit is now public and may be used. The patch is identified as adf2d9a09945fc98c85a2520a89f441d78b2dbd8. It is advisable to implement a patch to correct this issue. The project maintainer explains: "I think it's very rare for someone to use this package with untrusted input".
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Analysis
by VulDB Data Team • 07/23/2026
The vulnerability identified in publint version 0.1.4 represents a critical command injection flaw within the package-manager Command Handler component, specifically affecting the child_process.exec function implementation in src/node/pack.js. This security weakness creates an avenue for arbitrary operating system command execution when the application processes untrusted input through its command handling mechanisms. The vulnerability requires local attack access, meaning an attacker must already have system-level privileges or execute code within the application's execution context to exploit the flaw effectively.
The technical implementation of this vulnerability stems from improper input validation and sanitization within the node.js child_process.exec function call, which directly executes shell commands based on user-provided parameters. When publint processes package management commands, it fails to properly escape or validate command arguments before passing them to the underlying operating system shell. This design flaw enables attackers to inject malicious commands that will execute with the privileges of the process owner, potentially allowing for privilege escalation, data exfiltration, or system compromise. The vulnerability maps directly to CWE-78, which specifically addresses OS Command Injection flaws in software applications.
The operational impact of this vulnerability extends beyond simple command execution, as it can enable attackers to manipulate the package management workflow and potentially compromise the integrity of the entire build and deployment pipeline. Local exploitation capabilities mean that any user with access to the system where publint is installed could leverage this vulnerability to execute arbitrary code, making it particularly dangerous in development environments or continuous integration systems. The public availability of exploit code significantly increases the risk profile, as malicious actors can readily implement this attack vector without requiring advanced technical skills.
Security mitigations for this vulnerability should primarily focus on implementing proper input validation and sanitization techniques before any command execution occurs. The recommended patch identified at adf2d9a09945fc98c85a2520a89f441d78b2dbd8 addresses the core issue by ensuring that user-provided inputs are properly escaped or filtered before being passed to shell commands. Additionally, implementing a least-privilege execution model for package management tools and utilizing safer alternatives to child_process.exec such as child_process.execFile which provides better input control can significantly reduce the risk of command injection attacks. Organizations should also consider implementing runtime monitoring and anomaly detection systems that can identify suspicious command execution patterns within their development environments.
The vulnerability demonstrates a common pattern in software security where simple input handling flaws can escalate into serious system compromise scenarios. It aligns with ATT&CK technique T1059.003 for command and scripting interpreter, specifically shell scripting, as attackers could leverage this vulnerability to execute malicious shell commands within the target environment. While the project maintainer notes that usage with untrusted input is rare, the nature of package managers and build tools makes them attractive targets for attackers seeking persistent access or privilege escalation opportunities, particularly in automated development environments where such tools are frequently executed with elevated privileges.