CVE-2026-34035 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.466, log drain secret and environment values were interpolated into shell commands without sufficient encoding, allowing an authenticated user to inject commands executed on the host. This issue is fixed in version 4.0.0-beta.466.
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Analysis
by VulDB Data Team • 07/07/2026
The vulnerability identified in Coolify versions prior to 4.0.0-beta.466 represents a critical command injection flaw that exploits improper input handling within the application's logging and environment variable processing mechanisms. This security weakness affects the core functionality of the tool, which is designed for self-hosted server management and application deployment. The vulnerability specifically manifests when log drain secrets and environment values are interpolated into shell commands without adequate encoding or sanitization measures.
The technical implementation of this flaw occurs within the command execution pipeline where user-provided data flows directly into shell contexts without proper escaping or validation. When authenticated users submit configuration values containing special shell characters, these inputs can be interpreted by the underlying shell as command syntax rather than literal data. This creates a scenario where maliciously crafted environment variables or log drain configurations can trigger unintended system commands on the host machine. The vulnerability aligns with CWE-78, which specifically addresses OS Command Injection vulnerabilities in software systems.
The operational impact of this vulnerability extends beyond simple privilege escalation as it provides authenticated attackers with arbitrary code execution capabilities on the underlying host system. This means that an attacker who has gained access to Coolify's administrative interface could potentially execute any command available to the executing user context, potentially leading to complete system compromise. The implications are particularly severe given that Coolify is designed for server management and deployment scenarios where elevated privileges are typically required.
From a threat modeling perspective, this vulnerability maps directly to ATT&CK technique T1059.001, which covers command and script interpreters, specifically targeting the execution of shell commands through compromised applications. The attack surface is limited to authenticated users, making it a privilege escalation vector rather than an initial access point. However, in environments where Coolify runs with elevated privileges or where administrative accounts are compromised, the impact can be devastating.
Mitigation strategies for this vulnerability require immediate patching to version 4.0.0-beta.466 or later, which implements proper input sanitization and shell escaping mechanisms. Organizations should also consider implementing additional security controls such as restricting administrative access to only trusted users, monitoring command execution logs, and employing principle of least privilege configurations. The fix demonstrates proper secure coding practices by ensuring that all user-provided inputs are properly escaped before being incorporated into shell contexts, preventing the exploitation of shell metacharacters and special syntax.
Security teams should conduct comprehensive audits of their Coolify installations to verify proper patching status and monitor for any suspicious command execution patterns that might indicate exploitation attempts. Additional defensive measures include implementing network segmentation, regular security assessments, and ensuring that all system components are kept current with the latest security updates. The vulnerability serves as a reminder of the critical importance of input validation and secure coding practices in applications that interact with system-level operations, particularly those involving shell command execution and environment variable processing.