CVE-2025-24959 is a low-severity vulnerability affecting the zx tool, which is designed for writing better scripts. This vulnerability allows attackers to manipulate environment variables, specifically through the `process.env` mechanism. If an attacker gains control over the values of these environment variables, they can inject unintended variables and potentially execute arbitrary commands within applications that utilize these variables for security-sensitive operations.
The severity of this vulnerability is classified as low, with a CVSS score of 1.0. Although the impact may not be immediate or highly detrimental, it can lead to unexpected behavior in applications that rely on environment variables for critical operations. The risk to organizations includes unauthorized command executions, which can compromise the integrity and confidentiality of their systems.
Currently, there is no known public exploit for this vulnerability, and it is not listed in the Known Exploited Vulnerabilities (KEV) database. However, organizations should remain vigilant, as unpatched instances could still be at risk if exploited in specific contexts.
Organizations should prioritize patching immediately by upgrading to version 8.3.2 of zx, which addresses this vulnerability. If upgrading is not feasible, it is crucial to implement mitigation strategies such as sanitizing user-controlled environment variable values before they are processed by `dotenv.stringify`. Specifically, avoid using characters like `"`, `'`, and backticks in variable values, or enforce strict validation mechanisms on environment variables.
Failure to address this vulnerability could expose organizations to significant risks, particularly if their applications process untrusted input.
Vulnerability Details
The official CVE description states that an attacker with control over environment variable values can inject unintended environment variables into `process.env`, leading to arbitrary command execution or unexpected behavior in applications that rely on environment variables for security-sensitive operations. The vulnerability has a CVSS score of 1.0, indicating a low severity level. The affected version is zx prior to 8.3.2, which has been patched to mitigate this issue.
Technical Analysis
The root cause of CVE-2025-24959 lies in the inadequate handling of environment variables within the zx tool. Attackers can manipulate these variables, especially when applications process untrusted input and pass it through `dotenv.stringify`. The attack vector is local, requiring the attacker to have access to the environment variables in question.
The attack complexity is classified as low, with the attacker needing only basic privileges to exploit this vulnerability. User interaction is required to some extent, as the attacker must control the environment variable values. The vulnerability has low impacts on confidentiality, integrity, and availability, as indicated by the CVSS metrics.
Risk & Impact Analysis
The real-world deployment risk associated with CVE-2025-24959 is moderate, primarily due to the low severity and exploitability of the vulnerability. Organizations utilizing the zx tool in environments where environment variables are extensively manipulated should assess their configurations and ensure that they are not processing untrusted input directly.
The urgency for addressing this vulnerability is low, given its low CVSS score and the absence of known exploitation. However, organizations should still schedule remediation to avoid potential risks associated with misconfigured environments and user-controlled input.
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
The affected version of zx is all versions prior to 8.3.2. Users are strongly encouraged to upgrade to version 8.3.2 immediately to mitigate the identified vulnerabilities.
Mitigation & Remediation
To mitigate this vulnerability, organizations should upgrade to zx version 8.3.2. If upgrading is not feasible, it is critical to sanitize any user-controlled environment variable values before using them with `dotenv.stringify`. Specifically, avoid using characters such as `"`, `'`, and backticks, or enforce strict validation of environment variables prior to their use.
For further security assessments, organizations can utilize application security assessment services to identify potential weaknesses in their systems.
Detection Guidance
Organizations should monitor logs for any unusual behavior related to environment variable handling. Behavioral anomalies may indicate attempts to exploit this vulnerability. Additionally, network signatures that detect unexpected environment variable manipulations should be implemented to safeguard against potential exploitation.
AppSecure Threat Intelligence Insight
The long-term significance of CVE-2025-24959 lies in the potential for attackers to leverage environment variable injections for broader attacks. This vulnerability highlights the importance of validating and sanitizing user input, particularly in environments that heavily rely on environment variables for configuration.
Security teams should consider this vulnerability as a reminder to implement strong input validation and output encoding practices. Furthermore, organizations can enhance their security posture by investing in penetration testing services to proactively identify vulnerabilities before they can be exploited.
Additionally, organizations should stay informed about emerging vulnerabilities through ongoing training and awareness programs. For more insights on security best practices, consider reviewing our article on penetration testing methodology to enhance your security framework.
Lastly, organizations may find value in understanding the broader trends within application security, particularly with regards to vulnerabilities like CVE-2025-24959, which emphasizes the need for comprehensive security assessments.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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