Mastra is a Typescript framework designed for building AI agents and assistants. Versions from 0.13.8 through 0.13.20-alpha.0 contain a vulnerability identified as CVE-2025-61685, categorized under CWE-548 (Exposure of Information Through Directory Listing). The vulnerability stems from a flawed implementation of directory traversal protection. Although the code includes a security check intended to prevent path traversal when reading file contents, this check is circumvented by subsequent logic that attempts to provide directory suggestions. This bypass allows an attacker with at least limited privileges (PR:L) to exploit the flaw remotely (AV:N) without user interaction (UI:N) to list arbitrary directories on the filesystem, including sensitive locations such as the user's home directory. The exposure of directory listings can reveal critical information about the file system structure, potentially aiding attackers in planning further attacks or identifying sensitive files. The vulnerability does not allow modification or deletion of files (Integrity: None, Availability: None), but the confidentiality impact is high due to information disclosure. The CVSS 3.1 base score is 6.5, reflecting a medium severity level. No known exploits are currently reported in the wild. The issue is resolved in mastra version 0.13.20, and users are advised to upgrade to this or later versions to mitigate the risk.

For European organizations, the primary impact of CVE-2025-61685 is the unauthorized disclosure of directory structures and potentially sensitive file information on systems running vulnerable versions of the mastra framework. This exposure can facilitate reconnaissance activities by attackers, enabling them to identify critical files, configuration data, or user information that could be leveraged in subsequent attacks such as privilege escalation, data exfiltration, or targeted malware deployment. Organizations involved in AI development or deploying AI assistants using mastra are at risk of having their internal file system layouts exposed, which could compromise intellectual property or user privacy. Although the vulnerability does not directly allow data modification or service disruption, the confidentiality breach can undermine trust and compliance with data protection regulations such as GDPR. The risk is heightened in environments where mastra is deployed on shared or multi-tenant systems, or where access controls are insufficient. Additionally, attackers exploiting this vulnerability remotely with low privileges and no user interaction increases the threat surface for European enterprises relying on this framework.

To mitigate CVE-2025-61685, European organizations should take the following specific actions: 1) Immediately upgrade all instances of the mastra framework to version 0.13.20 or later, where the vulnerability is fixed. 2) Conduct an inventory of all systems running vulnerable mastra versions to ensure comprehensive patching. 3) Restrict network access to services running mastra to trusted internal networks or VPNs to reduce exposure to remote attackers. 4) Implement strict access controls and least privilege principles for users and services interacting with mastra to limit the ability of attackers to exploit the vulnerability. 5) Monitor logs and network traffic for unusual directory listing requests or patterns indicative of reconnaissance attempts. 6) If upgrading is not immediately feasible, consider deploying web application firewalls (WAFs) or intrusion detection systems (IDS) with custom rules to detect and block directory traversal attempts targeting mastra endpoints. 7) Educate developers and system administrators about secure coding practices to avoid similar logic bypasses in path validation. 8) Regularly review and audit filesystem permissions to minimize sensitive data exposure even if directory listings occur.