CVE-2026-15033 in check-peer-dependencies
Summary
by MITRE • 07/08/2026
A flaw has been found in christopherthielen check-peer-dependencies up to 4.3.4. Affected by this vulnerability is the function shelljs.exec of the file dist/packageUtils.js of the component peerDependencies. This manipulation causes os command injection. The attack may be initiated remotely. The project was informed of the problem early through an issue report but has not responded yet.
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Analysis
by VulDB Data Team • 07/08/2026
The vulnerability identified in christopherthielen check-peer-dependencies version 4.3.4 represents a critical operating system command injection flaw that stems from improper input validation within the shelljs.exec function implementation. This security weakness exists within the dist/packageUtils.js file and specifically targets the peerDependencies component functionality. The flaw allows malicious actors to execute arbitrary operating system commands through crafted input parameters that are not properly sanitized before being passed to the underlying shell execution mechanism.
The technical exploitation of this vulnerability occurs when the shelljs.exec function processes user-supplied data without adequate sanitization or validation, creating a direct pathway for command injection attacks. This type of vulnerability falls under the CWE-78 category known as "Improper Neutralization of Special Elements used in an OS Command" and aligns with ATT&CK technique T1059.001 for command and scripting interpreter. The attack vector is particularly concerning as it can be initiated remotely, meaning that unauthorized parties can exploit this flaw from external networks without requiring local system access or elevated privileges.
The operational impact of this vulnerability extends beyond simple command execution capabilities, as it provides potential attackers with full control over the affected system's command processing environment. An attacker could leverage this weakness to perform reconnaissance activities, escalate privileges, install malicious software, or exfiltrate sensitive data from systems running vulnerable versions of the check-peer-dependencies package. The remote exploitation capability significantly amplifies the risk profile since attackers can target systems without physical access or prior authentication.
Security practitioners should immediately implement mitigations including updating to the latest version of check-peer-dependencies where this vulnerability has been addressed, implementing network segmentation to limit access to affected systems, and monitoring for suspicious command execution patterns. Organizations should also consider implementing input validation controls at multiple layers of their application architecture and establish proper dependency management practices to prevent similar vulnerabilities from occurring in other components. The lack of response from the project maintainers following the initial issue report creates additional risk as there may be extended periods without official patches or security updates, potentially leaving systems exposed for prolonged durations.
This vulnerability demonstrates the critical importance of proper input sanitization and secure coding practices in package management tools that interact with system-level commands. The flaw serves as a reminder that even seemingly innocuous utility functions can become significant security risks when they fail to properly validate or sanitize user inputs before executing system operations. Organizations should conduct comprehensive vulnerability assessments of their dependency trees and implement automated security scanning processes to identify similar weaknesses across their software supply chains. The remote exploitability of this flaw underscores the need for proactive security measures rather than reactive patch management approaches, particularly in environments where development and deployment automation relies heavily on third-party packages that may contain unpatched vulnerabilities.