CVE-2026-0613 is a vulnerability categorized under CWE-497 (Exposure of Sensitive System Information to an Unauthorized Control Sphere) found in TheLibrarian.io, a product used for document and knowledge management. The flaw arises from the 'web_fetch' tool within TheLibrarian, which can be manipulated to perform Server-Side Request Forgery (SSRF)-style GET requests targeting internal IP addresses and services. This behavior effectively enables an attacker to scan internal ports and services within the Hetzner cloud environment where TheLibrarian is hosted. The vulnerability allows an unauthenticated remote attacker to gather sensitive information about internal network topology and running services without requiring user interaction. The CVSS v3.1 score is 7.5 (high), reflecting its network attack vector, low complexity, no privileges required, and no user interaction needed, with a significant impact on confidentiality. While no known exploits have been reported in the wild, the vendor has addressed the issue in all affected versions. The vulnerability's exploitation could serve as a reconnaissance step for more advanced attacks, such as lateral movement or targeted exploitation of internal services. The lack of authentication and user interaction requirements increases the risk of automated scanning and exploitation attempts.

For European organizations, especially those using TheLibrarian.io hosted on Hetzner cloud infrastructure, this vulnerability poses a significant risk of internal network reconnaissance by unauthorized actors. Exposure of internal IP addresses and services can lead to the disclosure of sensitive system information, which attackers can leverage to identify vulnerable internal services and plan further attacks such as privilege escalation, data exfiltration, or service disruption. The confidentiality of internal network architecture and service availability information is compromised, potentially undermining trust and compliance with data protection regulations such as GDPR. Organizations relying on TheLibrarian.io for critical document management may face increased risk of targeted attacks if internal network details are exposed. The vulnerability's ease of exploitation without authentication or user interaction further amplifies its threat to European enterprises, particularly those with sensitive or regulated data hosted in Hetzner data centers.

1. Immediately apply the vendor-provided patches for TheLibrarian.io to all affected versions to remediate the vulnerability. 2. Restrict TheLibrarian's ability to make outbound requests to internal IP ranges by implementing network segmentation and egress filtering at the firewall or cloud security group level. 3. Monitor and log all outbound requests made by TheLibrarian, especially those targeting internal IP addresses or unusual ports, to detect potential exploitation attempts. 4. Employ Web Application Firewalls (WAFs) or Intrusion Detection/Prevention Systems (IDS/IPS) to identify and block SSRF-like request patterns. 5. Conduct regular internal network scans and penetration tests to identify and remediate any exposed internal services that could be discovered via SSRF. 6. Limit the exposure of sensitive internal services by enforcing strict access controls and minimizing unnecessary service availability within the internal network. 7. Educate security teams about SSRF risks and ensure incident response plans include procedures for handling SSRF-related incidents.