CVE-2026-15621 in clawlet
Summary
by MITRE • 07/14/2026
A vulnerability was detected in mosaxiv clawlet up to 0.2.10. This impacts the function read_file/write_file/edit_file of the file tools/fs_ops.go of the component File Tools. Performing a manipulation results in link following. The attack needs to be approached locally. The reported GitHub issue was closed with the label "not planned".
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Analysis
by VulDB Data Team • 07/14/2026
The vulnerability identified in mosaxiv clawlet version 0.2.10 represents a significant security flaw within the file operations component that could potentially allow unauthorized access to system resources through symbolic link manipulation. This weakness exists specifically within the function implementations read_file, write_file, and edit_file located in the file tools/fs_ops.go module of the File Tools component. The vulnerability stems from insufficient validation of file paths during file operations, creating an opportunity for attackers to exploit symbolic link following mechanisms that could lead to unintended file access or modification.
The technical implementation flaw manifests when the application processes file operations without properly resolving or validating symbolic links before executing read, write, or edit operations. This creates a path traversal condition where an attacker with local access can manipulate file paths to follow symbolic links to locations outside of intended directories. The vulnerability operates under the principle that file system operations should validate the actual target of file paths rather than simply following symbolic references without proper authorization checks. This issue aligns with common weakness enumerations such as CWE-36, which addresses symbolic link following vulnerabilities, and CWE-22, which covers improper limitation of a pathname to a restricted directory.
Operationally, this vulnerability presents a local privilege escalation risk that could allow an attacker with access to the system to read sensitive files or modify critical data in unintended locations. The attack vector requires only local system access, making it particularly concerning for environments where local user privileges are not properly restricted. An attacker could potentially craft malicious symbolic links that point to sensitive configuration files, system binaries, or user data, then exploit the vulnerable file operations to gain unauthorized access or modification capabilities. The impact extends beyond simple information disclosure as it could enable attackers to modify system components or inject malicious code through file editing operations.
The vulnerability's classification under ATT&CK framework would fall within the Privilege Escalation and Defense Evasion techniques, specifically targeting the exploitation of weak file system permissions and path resolution mechanisms. Given that the reported GitHub issue was closed with "not planned" status, this indicates that the maintainers have not prioritized addressing the vulnerability despite its potential security implications. Organizations using this software should implement immediate mitigations including restricting local user access to the application, implementing proper file path validation in custom code, and ensuring that symbolic link following is explicitly disabled or properly validated before any file operations are performed. Additionally, system administrators should consider implementing monitoring solutions to detect unauthorized symbolic link creation or modification activities that could indicate exploitation attempts.
The root cause of this vulnerability demonstrates a fundamental lack of input validation and proper file system access controls within the application's core file handling routines. This type of flaw commonly occurs when developers assume that standard file operations will automatically handle path resolution safely without explicit security checks. The solution requires implementing comprehensive path validation mechanisms that resolve symbolic links to their actual targets, verify directory permissions, and ensure that all file operations occur within intended boundaries. Regular security auditing of file system operations should be conducted to identify similar vulnerabilities in other components and to maintain secure coding practices throughout the application lifecycle.