CVE-2026-30633 in knowns
Summary
by MITRE • 07/21/2026
Directory traversal vulnerability in knowns-dev/knowns 0.11.4 via crafted path value to the get_doc and update_doc tools.
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Analysis
by VulDB Data Team • 07/21/2026
A directory traversal vulnerability exists in the knowns-dev/knowns application version 0.11.4 that allows unauthorized access to files outside the intended directory structure through manipulation of path parameters in the get_doc and update_doc functionality. This vulnerability stems from inadequate input validation and sanitization mechanisms within the application's file handling processes, enabling attackers to craft malicious path values that can traverse upward through the directory hierarchy. The flaw specifically affects the application's ability to properly validate user-supplied path inputs, allowing arbitrary file access and potential modification of system files. According to CWE-22, this represents a classic path traversal vulnerability where insufficient restrictions on user-provided input enable attackers to access files outside the intended directory scope. The vulnerability manifests when the application processes requests containing specially crafted path values that include directory navigation sequences such as ../ or ..\, which bypass normal file access controls and permit unauthorized file system operations.
The operational impact of this vulnerability extends beyond simple information disclosure to potentially enable complete system compromise through unauthorized file modification, execution of malicious code, or data destruction. Attackers can leverage this weakness to access sensitive configuration files, database credentials, application source code, or other critical system resources that should remain protected from user interaction. The get_doc and update_doc tools become entry points for exploitation where the vulnerability can be triggered without requiring elevated privileges, making it particularly dangerous in environments where these tools are exposed to untrusted users or external networks. Security professionals should note that this vulnerability aligns with ATT&CK technique T1083 (File and Directory Discovery) and T1566 (Phishing for Information) as attackers may use directory traversal to discover system files and gather intelligence about the target environment.
Mitigation strategies must address both immediate remediation and long-term security improvements within the application's architecture. The primary fix involves implementing strict input validation that filters or rejects any path components containing directory traversal sequences, utilizing whitelisting approaches for acceptable file paths rather than relying on blacklisting techniques that can be bypassed. Organizations should enforce proper access controls and privilege separation to ensure that file operations occur within designated directories only, implementing sandboxing mechanisms where possible. Additionally, the application should employ secure coding practices such as using safe file handling functions that prevent path manipulation, implementing proper error handling that does not reveal internal file system structure, and conducting thorough input sanitization at multiple layers of the application stack. Regular security testing including dynamic analysis and penetration testing should be conducted to identify similar vulnerabilities in other components of the application ecosystem, while also ensuring that updates and patches are applied promptly to address known security issues. The vulnerability highlights the critical importance of validating all user inputs and implementing principle of least privilege access controls to minimize potential damage from such security flaws.