CVE-2026-34038 in Coolify
Summary
by MITRE • 07/07/2026
Coolify is an open-source and self-hostable tool for managing servers, applications, and databases. Prior to 4.0.0-beta.469, an authenticated remote command injection vulnerability in application deployment handling allows users with application write permissions to achieve remote code execution and exfiltrate sensitive environment variables through deployment logs via fields such as dockerfile_location and deployment commands. This issue is fixed in version 4.0.0-beta.469.
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Analysis
by VulDB Data Team • 07/07/2026
The vulnerability identified in Coolify versions prior to 4.0.0-beta.469 represents a critical authenticated remote command injection flaw that significantly compromises the security posture of self-hosted environments. This vulnerability specifically targets the application deployment handling mechanisms within the platform, creating a pathway for attackers who possess write permissions to applications to execute arbitrary commands on the underlying server infrastructure. The flaw manifests through improper input validation and sanitization of user-supplied data during the deployment process, particularly affecting fields such as dockerfile_location and deployment command parameters.
The technical implementation of this vulnerability stems from insufficient sanitization of user inputs that are directly incorporated into system commands or shell executions without proper escaping or encoding mechanisms. When authorized users with application write permissions submit deployment configurations containing malicious payloads in fields like dockerfile_location, these inputs are processed by the backend without adequate protection against command injection attacks. This design flaw allows attackers to inject shell commands that execute with the privileges of the Coolify service account, potentially enabling full system compromise and unauthorized access to sensitive data.
The operational impact of this vulnerability extends beyond simple code execution, as it provides attackers with the capability to exfiltrate sensitive environment variables that are often stored in deployment logs. These environment variables frequently contain database credentials, API keys, encryption secrets, and other confidential information that could be leveraged for further attacks within the network. The logging mechanism becomes a vector for data leakage, as malicious commands can be crafted to redirect or extract this sensitive information from the system's memory or storage. This threat is particularly severe in environments where Coolify manages multiple applications with varying levels of security requirements and access controls.
The vulnerability aligns with CWE-78, which specifically addresses "Improper Neutralization of Special Elements used in an OS Command," and represents a classic example of command injection that can be exploited through authenticated access. From an attack framework perspective, this issue maps to ATT&CK technique T1059.004 for 'Command and Scripting Interpreter: Unix Shell' and T1566.001 for 'Phishing: Spearphishing Attachment'. The mitigation strategy requires immediate deployment of version 4.0.0-beta.469 or later, which implements proper input sanitization and command execution restrictions. Organizations should also implement additional security controls including privilege separation, logging monitoring for suspicious command patterns, and regular security assessments of their self-hosted tools to prevent similar vulnerabilities in other components of their infrastructure stack.